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Behavior

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The eyes of sockeye salmon are located on opposite sides of their head, and they thus have a greater field of vision than animals with two eyes facing forward. The spectrum of visibility of sockeye salmon includes color, from indigo to red, as well as ultraviolet light. Members of this species have nostrils and an enhanced sense of smell. This also adds to their sense of taste. Additionally, sockeye salmon have lateral lines, which detect vibrations, allowing them to hear.

Perception Channels: visual ; ultraviolet; tactile ; vibrations ; chemical

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Kennedy, S. 2011. "Oncorhynchus nerka" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Oncorhynchus_nerka.html
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Stephan Kennedy, Radford University
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Associations

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Adult sockeye salmon are easily spotted and caught because of their size, and they are eaten by bears, including brown bears and black bears, and birds, such as the mew gull. Predators of frys (young sockeye salmon) include lake trout, squawfish, and mountain whitefish. Most predation occurs in streams and rivers. As frys, sockeye salmon can often escape predators because of their smaller size. Humans also consume a considerable about of sockeye salmon.

Known Predators:

  • Brown Bear Ursus arctos
  • Black Bear Ursus americanus
  • Bald Eagle Haliaeetus leucocephalus
  • Rainbow Trout Oncorhynchus mykiss)
  • Cutthroat Trout Oncorhynchus clarkii clarkii
  • Sculpins Cottus asper
  • Mountain Whitefish Prosopium williamsoni
  • Arctic Turns Sterna paradisaea
  • Lake Trout Salvelinus namaycush
  • Squawfish Ptychocheilus oregonensis
  • Mew Gulls Larus canus
  • Humans Homo sapiens
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Kennedy, S. 2011. "Oncorhynchus nerka" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Oncorhynchus_nerka.html
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Stephan Kennedy, Radford University
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Gail McCormick, Special Projects
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Morphology

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When sockeye salmon hatch, they lack pigment and thus color. As they grow into fry, they become green and can have black spots. Sockeye salmon are typically blue in color until they reach reproductive age, when they brighten in color; their bodies turn read and their heads green. Additional distinctive markings appear on the head of males and sides of females during the spawning period. When ready to reproduce, sockeye salmon weigh 1 to 4 kg and measure on average 63 cm in length. Sockeye salmon are commonly misidentified. The otolith, or inner ear, of this species is distinct in size and shape from other members of the genus g. Oncorhynchus. This, however, is not always exact as there can be overlap among species in addition to intraspecific differences.

Range mass: 1 to 4 kg.

Average length: 63 cm.

Other Physical Features: ectothermic ; bilateral symmetry

Sexual Dimorphism: male more colorful

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Kennedy, S. 2011. "Oncorhynchus nerka" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Oncorhynchus_nerka.html
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Stephan Kennedy, Radford University
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Gail McCormick, Special Projects
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Life Expectancy

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The average lifespan for sockeye salmon in the wild is 4 to 5 years. The oldest salmon caught was 8 years of age. Typically, sockeye salmon die after mating.

Range lifespan
Status: wild:
8 (high) years.

Typical lifespan
Status: wild:
4 to 5 years.

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Kennedy, S. 2011. "Oncorhynchus nerka" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Oncorhynchus_nerka.html
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Stephan Kennedy, Radford University
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Habitat

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Sockeye salmon are born in lakes, rivers, or streams, which are calmer than the Pacific Ocean. After fry, or young salmon, develop, they migrate to the Pacific Ocean where they spend most of their life. They are generally found at depths of 15 to 33 m.

Range depth: 15 to 33 m.

Habitat Regions: temperate ; polar ; saltwater or marine ; freshwater

Aquatic Biomes: pelagic ; lakes and ponds; rivers and streams; coastal ; brackish water

Other Habitat Features: estuarine

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Kennedy, S. 2011. "Oncorhynchus nerka" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Oncorhynchus_nerka.html
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Distribution

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Sockeye salmon, Oncorhynchus nerka, are native to the western coast of North America in the Pacific Ocean. They can be located as far north as northern Alaska and as far south as northern California. During the mating season, Sockeye salmon travel inland as far as mid-west Idaho. Populations of this species have also been introduced in some areas of Asia and Russia.

Biogeographic Regions: nearctic (Native ); palearctic (Introduced ); pacific ocean (Native )

Other Geographic Terms: holarctic

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Kennedy, S. 2011. "Oncorhynchus nerka" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Oncorhynchus_nerka.html
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Trophic Strategy

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While in the ocean, sockeye salmon primarily consume zooplankton. In freshwater environments, they are known to eat insects, and, when upstream, occasionally snails.

Animal Foods: insects; mollusks; zooplankton

Primary Diet: planktivore

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Kennedy, S. 2011. "Oncorhynchus nerka" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Oncorhynchus_nerka.html
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Stephan Kennedy, Radford University
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Associations

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Sockeye salmon are host to a variety of parasites, which are generally found within the kidney. Most of these parasites release spores when in freshwater where excretion of water by sockeye salmon is high. These parasites include Myxidium salvelini and Parvicapsula minibicornis, both myxosporeans. Sockeye salmon also contribute to the diet of black bears and brown bears.

Commensal/Parasitic Species:

  • Myxidium salvelini
  • Parvicapsula minibicornis
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Kennedy, S. 2011. "Oncorhynchus nerka" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Oncorhynchus_nerka.html
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Stephan Kennedy, Radford University
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Gail McCormick, Special Projects
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Benefits

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Sockeye salmon are commonly fished and are the most common species of salmon caught around British Columbia and Alaska.

Positive Impacts: food

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Kennedy, S. 2011. "Oncorhynchus nerka" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Oncorhynchus_nerka.html
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Stephan Kennedy, Radford University
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Benefits

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Salmon, including sockeye salmon, are caught in and destroyed by hydroelectric dams when they attempt to swim through to spawn. This decreases salmon populations and thus availability for fishing.

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Kennedy, S. 2011. "Oncorhynchus nerka" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Oncorhynchus_nerka.html
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Stephan Kennedy, Radford University
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Karen Francl, Radford University
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Gail McCormick, Special Projects
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Life Cycle

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Sockeye salmon follow the developmental patterns of many pacific salmon. Eggs are externally fertilized by the male. Embryos begin as a single cell with a yolk. After this cell divides, the resulting cells differentiate into specific body type cells until the fetus is developed and ready to hatch, at which time it is called an alevin. Alevins carry the yolk on the anterior end of their body and appear to be clear because they have no pigment. As alevins develop into adults, the yolk shrinks and coloration occurs. Sex of sockeye salmon is initially difficult to determine, but is easily determined later in life by their body shape and coloration.

Development - Life Cycle: metamorphosis ; indeterminate growth

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Kennedy, S. 2011. "Oncorhynchus nerka" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Oncorhynchus_nerka.html
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Stephan Kennedy, Radford University
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Gail McCormick, Special Projects
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Conservation Status

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Although listed as a species of least concern by the IUCN Red List, the U.S. Fish and Wildlife Service Species Report listed O. nerka as endangered in 1992. In some areas, sockeye salmon are only listed as threatened, as populations have stabilized. Many programs have been implemented to prevent over-fishing and to rejuvenate sockeye populations in areas where over-fishing has occurred.

US Federal List: endangered; threatened

CITES: no special status

State of Michigan List: no special status

IUCN Red List of Threatened Species: least concern

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Kennedy, S. 2011. "Oncorhynchus nerka" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Oncorhynchus_nerka.html
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Stephan Kennedy, Radford University
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Karen Francl, Radford University
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Gail McCormick, Special Projects
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Reproduction

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Sockeye salmon mate seasonally. Females lay their eggs and are then to select a mate. Males are chosen after they have come along her side and presented themselves multiple times. They are judged on their color and size. During this process, males can be attacked by females and other males. Larger dominant males reproduce more often than other males and, because sockeye salmon are polygynous, the dominant male can mate with many females. Some subordinate males may not have the opportunity to mate at all.

Mating System: polygynous

Sockeye salmon breed from July to October, although some members of this speices located in the southern-most point of their geographic range have been known to breed into December. When females arrive, they create a nest in the gravel in which they lay their eggs. After fertilization, eggs stay in the gravel nest for 32 to 42 days. Females produce 47 to as many as 206 offspring. Sockeye salmon are independent when hatched and are able to reproduce at 4 to 5 years of age.

Breeding interval: Sockeye salmon breed once a year.

Breeding season: Sockeye salmon generally breed from July to October.

Range number of offspring: 47 to 206.

Range gestation period: 32 to 42 days.

Average time to independence: 0 years.

Range age at sexual or reproductive maturity (female): 4 to 5 years.

Average age at sexual or reproductive maturity (female): 4 to years.

Range age at sexual or reproductive maturity (male): 4 to 5 years.

Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); sexual ; fertilization (External ); broadcast (group) spawning; oviparous

Mothers invest time creating gravel nests, in which eggs incubate. After fertilization, however, the newly hatched alevin have no parental investment.

Parental Investment: no parental involvement; female parental care ; pre-fertilization (Protecting: Female); pre-hatching/birth (Provisioning: Female)

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Kennedy, S. 2011. "Oncorhynchus nerka" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Oncorhynchus_nerka.html
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Stephan Kennedy, Radford University
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Karen Francl, Radford University
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Gail McCormick, Special Projects
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Comprehensive Description

provided by EOL staff

The Sockeye or Red Salmon (Oncorhynchus nerka) is native to northeastern Asia and, in North America, Arctic and Pacific drainages from Point Hope, Alaska, to the Sacramento River drainage in California. Landlocked populations are found in Alaska, Yukon Territory, British Columbia, Washington, and Oregon. This species is relatively common in the northern part of its North American range, but rarer south of the Columbia River drainage. Although it has been widely stocked, most transplant attempts have failed to establish populations. (Page and Burr 1991)

At different periods in the life cycle, Sockeye Salmon are found in the open ocean and, typically, in lakes, which they reach by migrating up coastal streams. Landlocked Sockeye Salmon are known as Kokanee. At sea, these fish are metallic blue and silver, but spawning (breeding) adults are very distinctively colored, turning bright red with a green head. Adults reach a size of around 84 cm in length. (Page and Burr 1991).

Approximately the first half of a Sockeye Salmon's four to six year lifespan is spent in freshwater, while the second half is spent foraging in estuarine and marine waters of the Pacific Ocean. Sockeye Salmon migrate upstream to breed just once, then die. For detailed information on the biology and status of this species, including conservation issues, see this resource from the NOAA Fisheries Office of Protected Resources.

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Benefits

provided by FAO species catalogs
Caught by gillnets and trawl nets. The total catch reported for this species to FAO for 1999 was 130 118 t. The countries with the largest catches were Russian Federation (14 889 t) and USA (110 836 t). Sashimi, smoked, and salt-broiled fish are favored.

Brief Summary

provided by FAO species catalogs
Anadromous, enters rivers in summer and spawns from autumn to winter in lake tributaries. Fecundity is about 2,000 to 4,000, and eggs are deposited by several redds. Incubation period varies from 2 to 5 months depending on temperature. Emerged fry go down to lakes and spend several years feeding on lake plankton. Young move to sea when the water temperature reaches over 7° C. Main food items in the open ocean are squid, small fish, and plankton such as amphipods and copepods.After 2 to 4 years of life in the sea, the salmon migrate to rivers. Thus mode of life of red salmon has many variations. Ages at spawning runs are between 2 to 8.

Size

provided by FAO species catalogs
To about 84 cm and 6.8 kg; usually to around 2.3-3.6 kg.

Distribution

provided by FAO species catalogs
A Pacific fish from Hokkaido, through Okhotsk Sea, Kamchatka, and Alaska to northern California; rare in streams south of the Columbia R. system. The land-locked form was introduced to several lakes, such as lake Shikotsu, Towada, Cûzenji, and Saiko (Japan).

Diagnostic Description

provided by FAO species catalogs
Body elongate, becoming deeper with age, spawning males a little hump-backed. Tip of upper jaw reaching well behind eye; snout and lower jaw becoming hooked and teeth enlarged in spawning males. Numerous fine gillrakers 28-44; numering about 35.

References

  • Catalog On Line. Fishbase: ICLARM . Eschmeyer, W.N., E.S. Herald & H. Hammann.- 1983A field guide to Pacific coast fishes of North America. Petersen Field Guide Series. Nº 28: i-xii+1-336 pp.
  • Vera, J. - 1992Diccionario multilingüe de especies marinas para el mundo hispano. Ministerio de Agricultura, Pesca y Alimentación. Secretaria General Técnica. 1282 pp.

Diseases and Parasites

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Enteric Redmouth Disease. Bacterial diseases
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Allan Palacio
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Trophic Strategy

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Epipelagic (Ref. 58426). There are two forms, the anadromous form known as the sockeye and the landlocked form (with a much smaller maximum size) known as the kokanee (Ref. 27547). Upon emergence from gravel, fry at first tends to avoid light, hiding during the day and emerging at night (Ref. 27547). In some populations, sockeye fry go to the sea during their first summer but most spend one or two (rarely three or four) years in a lake before migrating (Ref. 30333). In a few streams of the Copper River drainage in Alaska, young sockeye stay in the stream (Ref. 27547). Once in the lake, the young spend a few weeks inshore, feeding largely on ostracods, cladocerans and insect larvae. The fish then become pelagic and move offshore, where they feed on plankton in the upper 20 m or so (Ref. 27547). Seaward migration follows with the young individuals first staying fairly close to shore, feeding mainly on zooplankton, but also on small fishes and insects (Ref. 30343, 30346). With growth, they head out to sea and fish become important in the diet (Ref. 27547). Kokanee are confined to lake-stream systems, and most of its life is spent in the lake (Ref. 27547). They feed mainly on plankton, but also take insects and bottom organisms (Ref. 1998). Kokanee, wherever they are native, have been derived from anadromous populations, and each kokanee population apparently has evolved independently from a particular sockeye run (Ref. 30338, 30339). Offspring of kokanee occasionally become anadromous, and sockeye offspring occasionally remain in freshwater (Ref. 27547). Lifespan of the kokanee varies from two to seven years in different stocks (Ref. 27547).
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Pascualita Sa-a
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Morphology

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Dorsal spines (total): 0; Dorsal soft rays (total): 11 - 16; Analspines: 0; Analsoft rays: 13 - 18; Vertebrae: 56 - 67
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Cristina V. Garilao
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Migration

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Anadromous. Fish that ascend rivers to spawn, as salmon and hilsa do. Sub-division of diadromous. Migrations should be cyclical and predictable and cover more than 100 km.
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Susan M. Luna
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Life Cycle

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Adult sockeyes return to natal streams to spawn. This occurs during summer and fall and as late as December in the southern part of the range. The female selects a site, usually with gravel bottom, and digs a nest. During nest building, the female is attended by a dominant male and a few subordinate males. At this stage, females tend to be aggressive toward other females and subordinate males; males are aggressive toward other males. Between digging acts, the female will rest over the pit while the dominant male courts her. Once the nest is completed, the female enters the nest, followed immediately by the dominant male who comes close beside her. Their mouths gape, and the pair vibrates to release eggs and sperm. One or more subordinate males may come to the other side of the female and join in the spawning. The female then moves to the upstream edge of the nest and digs again, covering the old nest, at the same time creating a new one just upstream from the previous one. A female normally needs 3 to 5 days to deposit all her eggs and utilizes 3 to 5 nests for this purpose. She may spawn with several dominant males. A male may breed with several females. All adult sockeye die after spawning (Ref. 27547).Reproductive strategy: synchronous ovarian organization, determinate fecundity (Ref. 51846).
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Diseases and Parasites

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Whirling Disease 3. Parasitic infestations (protozoa, worms, etc.)
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Allan Palacio
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Diagnostic Description

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Both the sockeye and the kokanee are distinguished by the long, fine, serrated, closely spaced gill rakers on the first arch that number between 30 and 40, and by its lack of definite spot on the back and tail (Ref. 27547). Body fusiform, streamlined, laterally compressed, body depth moderate, slightly deeper in breeding males (Ref. 6885). Head bluntly pointed, conical, eye rather small, position variable with sex and condition; snout rather pointed (Ref. 6885). Lateral line straight (Ref. 27547). Pelvic fins with axillary process; caudal emarginate (Ref. 27547). Pre-spawning fish are dark steel blue to greenish blue on the head and back, silvery on the sides and white to silvery on the belly; no definite spots on the back, although some individuals may have dark speckling and irregular marks on the dorsal fin (Ref. 27547). At spawning, the head of the males becomes bright to olive green, with black on the snout and upper jaw; the adipose and anal fins turn red and the paired fins and tail generally become grayish to green or dark; females are generally less brilliantly colored than males (Ref. 27547). Various populations may show less brilliant colors, and a few turn dull green to yellowish, with little if any red (Ref. 27547).
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Biology

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Epipelagic (Ref. 58426). Occurs in open ocean and lakes and migrates up to coastal streams to spawn (Ref. 86798). There are two forms, the anadromous form known as the sockeye and the landlocked form (with a much smaller maximum size) known as the kokanee (Ref. 27547). Upon emergence from gravel, fry at first tends to avoid light, hiding during the day and emerging at night (Ref. 27547). In some populations, sockeye fry go to the sea during their first summer but most spend one or two (rarely three or four) years in a lake before migrating (Ref. 30333). In a few streams of the Copper River drainage in Alaska, young sockeye stay in the stream (Ref. 27547). Once in the lake, the young spend a few weeks inshore, feeding largely on ostracods, cladocerans and insect larvae. The fish then become pelagic and move offshore, where they feed on plankton in the upper 20 m or so (Ref. 27547). Seaward migration follows with the young individuals first staying fairly close to shore, feeding mainly on zooplankton, but also on small fishes and insects (Ref. 30343, 30346). With growth, they head out to sea and fish become important in the diet (Ref. 27547). Kokanee are confined to lake-stream systems, and most of its life is spent in the lake (Ref. 27547). They feed mainly on plankton, but also take insects and bottom organisms (Ref. 1998). Kokanee, wherever they are native, have been derived from anadromous populations, and each kokanee population apparently has evolved independently from a particular sockeye run (Ref. 30338, 30339). Offspring of kokanee occasionally become anadromous, and sockeye offspring occasionally remain in freshwater (Ref. 27547). Lifespan of the kokanee varies from two to seven years in different stocks (Ref. 27547). The sockeye is one of the most commercially important Pacific salmons; the kokanee is primarily a sport fish but also makes excellent food and in some areas well regarded as food for large trout (Ref. 27547). Marketed fresh, dried or salted, smoked, canned, and frozen; eaten steamed, fried, broiled, microwaved, and baked (Ref. 9988).
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Importance

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fisheries: highly commercial; aquaculture: commercial; gamefish: yes; aquarium: public aquariums; price category: very high; price reliability: questionable: based on ex-vessel price for species in this genus
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Sockeye salmon

provided by wikipedia EN

The sockeye salmon (Oncorhynchus nerka), also called red salmon, kokanee salmon, blueback salmon, or simply sockeye, is an anadromous species of salmon found in the Northern Pacific Ocean and rivers discharging into it. This species is a Pacific salmon that is primarily red in hue during spawning. They can grow up to 84 cm (2 ft 9 in) in length and weigh 2.3 to 7 kg (5–15 lb). Juveniles remain in freshwater until they are ready to migrate to the ocean, over distances of up to 1,600 km (1,000 mi). Their diet consists primarily of zooplankton. Sockeye salmon are semelparous, dying after they spawn. Some populations, referred to as kokanee, do not migrate to the ocean and live their entire lives in fresh water.

Classification and name origin

The sockeye salmon is the third-most common Pacific salmon species, after pink and chum salmon.[2] Oncorhynchus comes from the Greek ὄγκος (onkos) meaning "barb", and ῥύγχος (rhynchos) meaning "snout". Nerka is the Russian name for the anadromous form.[3] The name "sockeye" is an anglicization of suk-kegh (sθə́qəy̓), its name in Halkomelem, the language of the indigenous people along the lower reaches of the Fraser River (one of British Columbia's many native Coast Salish languages). Suk-kegh means "red fish".[4][5]

Description

The sockeye salmon is sometimes called red or blueback salmon, due to its color.[5] Sockeye are blue tinged with silver in color while living in the ocean.[3] When they return to spawning grounds, their bodies become red and their heads turn green. Sockeye can be anywhere from 60 to 84 cm (2 ft 0 in – 2 ft 9 in) in length and weigh from 2.3 to 7 kg (5–15 lb).[5] Two distinguishing features are their long, serrated gill rakers that range from 30 to 40 in number, and their lack of a spot on their tail or back.[3]

Range and habitat

Sockeye salmon range as far south as the Columbia River in the eastern Pacific (although individuals have been spotted as far south as the 10 Mile River on the Mendocino Coast of California) and in northern Hokkaidō Island in Japan in the western Pacific. They range as far north as the Bathurst Inlet in the Canadian Arctic in the east and the Anadyr River in Siberia in the west. The farthest inland sockeye salmon travel is to Redfish Lake, Idaho, over 1,400 km (900 mi) by river from the ocean and 2,000 m (6,500 ft) in elevation.[6] In the United States, populations of sockeye salmon have been extirpated from Idaho and Oregon.

Landlocked populations

Male spawning-phase sockeye

Some sockeye salmon populations are completely landlocked. Sockeye that live and reproduce in lakes are commonly called kokanee, which is red-fish name in the Sinixt Interior Salish language and silver trout in the Okanagan language.[7][8] They are much smaller than the anadromous variety and are rarely over 35 cm (14 in) long. In the Okanagan Lake and many others, there are two kinds of kokanee populations – one spawns in streams and the other near lake shores. Landlocked populations occur in the Yukon Territory and British Columbia in Canada, as well as, in Alaska, Washington, Oregon, California, New York, Utah, Idaho, Montana, Nevada, Colorado, New Mexico, and Wyoming in the United States. Nantahala Lake is the only place in North Carolina where kokanee salmon are found.[3] The fish, which is native to western North America, was stocked in Nantahala Lake in the mid-1960s by the NC Wildlife Resources Commission in an attempt to establish the species as a forage fish for other predator fishes in the lake. This stock has remained and become a favorite target for anglers.[9]

In Japan, a landlocked variety termed black kokanee, or "kunimasu" in Japanese, was deemed to be extinct after 1940, when a hydroelectric project made its native lake in northern Akita Prefecture more acidic. The species seems to have been saved by transferring eggs to Saiko Lake, 500 kilometers to the south, however.[10] This fish has been treated as a subspecies of sockeye Oncorhynchus nerka kawamurae, or even an independent species Oncorhynchus kawamurae.[11]

Diet

Sockeye salmon use patterns of limnetic feeding behavior, which encompasses vertical movement, schooling, diel feeding chronology, and zooplankton prey selectivity. They can change their position in the water column, timing and length of feeding, school formation, and choice of prey to minimize the likelihood of predation. This also ensures they still get at least the minimum amount of food necessary to survive. All of these behaviors contribute to the survivability, and therefore fitness of the salmon. Depending on location and threat of predation, the levels of aggressive feeding behavior can vary.[12][13]

Sockeye salmon, unlike other species of Pacific salmon, feed extensively on zooplankton during both freshwater and saltwater life stages.[14] They also tend to feed on small aquatic organisms such as shrimp. Insects are part of their diets at the juvenile stage.[3]

Life cycle

Male sockeye salmon

Sockeye salmon exhibit many different life histories with the majority being anadromous where the juvenile salmon migrate from freshwater lakes and streams to the ocean before returning as adults to their natal freshwater to spawn.[15] Similar to most Pacific salmon, sockeye salmon are semelparous, meaning they die after spawning once. Some sockeye, called kokanee, do not migrate to the ocean and live their entire lives in freshwater lakes.[16] The majority of sockeye spawn in rivers near lakes and juveniles will spend one to two years in the lake before migrating to the ocean, although some populations will migrate to saltwater in their first year.[17] Adult sockeye will spend two to three years in the ocean before returning to freshwater. Females will spawn in 3–5 redds over a period of several days. The eggs usually hatch within six to nine weeks and the fry typically rear in lakes before migrating to the ocean.[18]

Reproduction

Spawning sockeye salmon

Males partake in competitive and sneaking tactics, formation of hierarchies, and non-hierarchical groupings around females who are ready to mate.[19] Reproductive success varies more in males than females. The greater variability in male reproduction is associated with the greater average size and exaggerated shape of males. Reproductive success in females is determined by the number of eggs she lays, her body size, and the survival of the eggs, which is due in part to the quality of the nest environment.[20] Male spatial distribution depends on shifts in reproductive opportunities, physical traits of breeding sites, as well as the operational sex ratio (OSR) of the environment.[19]

Non-dominant males adopt a subordinate behavior, acting as a satellite to mated pairs. During spawning, a subordinate male will move quickly into the redd and release their sperm. Nearby dominant males from other redds will also do this.[21] Male social status is positively correlated to length and dorsal hump size. Larger females tend to spawn in shallower water, which is preferred over deeper water.[20]

A male (left) and female (right) sockeye salmon spawning in the Adams River of British Columbia, Canada.

There is a dramatic sexual dimorphism at maturity.[20] Males go through numerous morphological changes at maturation including, an increase in body depth, hump height, and snout length. Snout size also increases in females, but hump height and adipose fin length do not increase. This could mean that longer snout sizes are sexually selected, but hump height and adipose fin length are not. Females develop large gonads that are about 25% of the body mass.[22]

Females are responsible for parental care. They select, prepare, and defend a nest site until they die or are displaced. Males do not participate in parental care at all, and they move between females after egg deposition.[23]

Sexual selection and natural selection

Sexual selection favors large males and females.[24] Males choose females based on their readiness to spawn and their size in order to maximize their breeding opportunities. Larger bodies allow females to reproduce larger and more numerous eggs, better nest choice and ability to defend it, and the ability to bury eggs deeper and provide more protection.[25] Females vary their breeding rate depending on the size of the courting male, mating more quickly with larger males. This increases the likelihood that larger males will displace attending, smaller males. Male sockeye salmon social status and greater reproductivity are directly associated with larger body size and more extreme body shapes; Larger bodies provide males with advantages when it comes to intrasexual competition and being selected for by females during reproduction.[25] Males preferentially spawn with females who are red, which is the usual color of females. Even small changes in wavelength, saturation, and brightness can affect preference.

Some traits that lead to reproductive success, such as body size and sexual dimorphism can affect one's survival. This leads to opposing pressures of natural selection and sexual selection. Larger males are favored, unless the risk of predation is very high. Sockeye salmon that die prematurely from predation are typically the larger ones in a population.[26] This shows natural selection against large bodies. Populations with higher levels of predation tend to evolve smaller body size.[27] Without the threat of predation, salmon that breed early in the season live longer than those that breed late in the season.[24]

Other ecological factors like stranding effect select for smaller body size in sockeye salmon when present in a habitat. Stranding is when salmon swim into dry land or shallow water during their migration for spawning and die from suffocation.[27] In fact, studies show that the Sockeye salmon with the largest bodies are most susceptible to stranding mortality.[28]

Energy cost

Reproduction is marked by depletion in energy stores. Fat, protein, and somatic energy stores decrease from the final moments in marine migration through freshwater entry, spawning, and death.[22] Sockeye salmon do not feed during reproduction.[21] Feeding ends once they enter into freshwater, which can be several months before spawning.[22] Embryos are maintained with only endogenous food supplies for about 3–8 months.[29] Reproduction in the sockeye salmon has to be accomplished with the energy stores brought to the spawning grounds. How the salmon use their energy during migration and spawning affects how successful they will be reproductively; energy used for migration cannot also be used for courtship. If they waste too much energy, they might not be able to spawn. Males must also make the decision whether to invest energy in fighting for a female or for longevity on the spawning grounds.[21] Sockeye salmon with longer and more difficult migration routes produce fewer eggs on the spawning grounds.[30] High water temperatures also increase the energy expenditure of sockeye salmon as they migrate upriver.[31]

Competition

Male sockeye salmon

Aggressive behavior displayed by dominant males is predominantly directed towards intruding dominant males. Sometimes sockeye salmon males behave aggressively towards subordinate males. These encounters are short, with the intruding male leaving after one or two aggressive interactions.[21] Spawning females direct their aggression primarily towards intruding females or other spawning females that are close by. However, they may also direct aggression towards intruding or subordinate males.[21] Aggressive interactions between females only last one or two charges and/or chases. The intruder retreats and the spawning female settles back in her redd.[21] These acts of aggression are important in terms of reproductive success, because they determine the quality of the nest site the female obtains and access to males.[21]

Competition for food or space while the salmon are in their lake residence period can exist. This happens when there is a more populous class of young sockeye or when there are multiple classes present. It can also happen when resources are in short supply. Interspecific competition can also occur and can lead to interactive segregation, which is when species emphasize their differences in diet and habitat to avoid competition. Interspecific competition can affect the growth rates of the salmon if their access to resources is limited.[32]

Fisheries and consumption

The total registered fisheries harvest of the sockeye in 2010 was some 170,000 tonnes, of which 115,000 tonnes were from the United States and the rest was equally divided between Canada and Russia. This corresponds to some 65 million fish in all, and to some 19% of the harvest of all Pacific salmon species by weight.[33]

Smoked sockeye salmon ready for consumption

Commercial fishermen in Alaska net this species using seines and gillnets for fresh or frozen fillet sales and canning. The annual catch can reach 30 million fish in Bristol Bay, Alaska, which is the site of the world's largest sockeye harvest.[34]

Sockeye salmon have long been important in the diet and culture of the Coast Salish people of British Columbia.

The largest spawning grounds in Asia are located on the Kamchatka Peninsula of the Russian Far East, especially on the Ozernaya River of the Kurile Lake, which accounts for nearly 90% of all Asian sockeye salmon production,[35] and is recognized as the largest spawning ground outside of Alaska.[36] Illegal fishing in Kamchatka is subject to environmental concern.[37]

Sockeye is almost never farmed. A facility in Langley, BC harvested its first salmon in March 2013, and continues to harvest farmed salmon from its inland facility.[38][39]

Conservation status

United States

A school of sockeyes swimming upstream to spawn. In the foreground, an arctic char waits.

United States sockeye salmon populations are currently listed under the US Endangered Species Act[40] by the National Marine Fisheries Service as an endangered species in the Snake River and as a threatened species in Lake Ozette, Washington. The Snake River sockeye salmon was listed as endangered in November 1991, after the Shoshone-Bannock Tribe at Fort Hall Indian Reservation petitioned the National Marine Fisheries Service.

Sockeye is an exception to 2010's forecast resurgence of Oregonian fish stocks. Spring Chinook, summer steelhead, and Coho are forecast to increase by up to 100% over 2008 populations. The sockeye population peaked at over 200,000 in 2008 and were forecast to decline to just over 100,000 in 2010. As an early indication of the unexpectedly high sockeye run in 2010, on July 2, 2010, the United States Army Corps of Engineers reported over 300,000 sockeye had passed over Bonneville Dam on the Columbia River. Lower temperatures in 2008 North Pacific waters brought in fatter plankton, which, along with greater outflows of Columbia River water, fed the resurgent populations.[41]

Proposed legislative efforts, such as the Northern Rockies Ecosystem Protection Act, are attempting to protect the headwaters of the sockeye salmon by preventing industrial development in roadless areas.

Record numbers of a once-waning population of sockeye salmon have been returning to the Northwest's Columbia Basin (as of June 2012), with thousands more crossing the river's dams in a single day than the total numbers seen in some previous years.[42]

Canada

Sockeye salmon jumping over a beaver dam, Aleknagik Lake, Alaska, United States

The conservation status of sockeye populations in Canada is under review by Fisheries and Oceans Canada as part of its Wild Salmon Policy strategy to standardize monitoring of wild salmon status.[43] Salmon runs of particular note are the Skeena and Nass river runs, and the most famous is the Fraser River sockeye run.

The Fraser River salmon run has experienced declines in productivity since the 1990s, mirroring a similar decline in the 1960s.[44]

The return abundance (population) of Fraser River sockeye in 2009 was estimated at a very low 1,370,000,[45] 13% of the pre-season forecast of 10,488,000.[46] That represented a decline from the recent (1993) historical cycle peak of 23,631,000[47] and the return abundance was the lowest in over 50 years. The reasons for this (former) decline remain speculative. According to a consortium of scientists assembled to review the problem, the decline highlights the uncertainty in forecasting salmon returns.[48] After the low returns, the Government of Canada launched a formal inquiry into the decline, the Commission of Inquiry into the Decline of Sockeye Salmon in the Fraser River.[49][50]

The Commission has been tasked with investigating all the factors which may affect Fraser River sockeye salmon throughout their life cycle. According to the terms of reference,[49][50] the subjects of investigation are "the impact of environmental changes along the Fraser River, marine environmental conditions, aquaculture, predators, diseases, water temperature and other factors that may have affected the ability of sockeye salmon to reach traditional spawning grounds or reach the ocean."

During the commission, hundreds of thousands of documents and scientific research papers were reviewed. Twelve technical reports were published using that information, looking at the possible impacts of diseases and parasites, hatchery diseases, contaminants, marine ecology, salmon farms, fisheries, predators, climate change and government management on the productivity of Fraser River sockeye runs.[51][52]

While the commission was holding public hearings, in the late summer of 2010, the largest run of sockeye since 1913 returned to the Fraser River system.[53] Final counts show that approximately 30 million salmon returned to the Fraser River and its tributaries in 2010. In total, approximately 11,591,000 Fraser sockeye were caught by Canadian fishers and 1,974,000 Fraser sockeye were caught by American fishers. The final projected escapement (fish which were not caught) was 15,852,990 fish.[54]

Recent unpredictable fluctuations in runs are speculated to be due to changing water temperatures.[55] There is high variation in thermal tolerance among the different sockeye salmon populations that migrate up the Fraser River.[56] The Chilko River sockeye salmon population is able to maintain cardiorespiratory function at higher temperatures, which may make them more resilient to the effects of rising river temperatures. In one study examining possible physiological mechanisms underlying these population differences in thermal tolerance, juvenile sockeye salmon from the Chilko River and Weaver Creek did not show any differences in force-frequency response of the heart or cardiac pumping capacity when reared in common garden temperatures at 5 °C and 14 °C.[57] Therefore, the physiology underlying these differences in thermal tolerance has yet to be determined.

Gallery

References

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Sockeye salmon: Brief Summary

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The sockeye salmon (Oncorhynchus nerka), also called red salmon, kokanee salmon, blueback salmon, or simply sockeye, is an anadromous species of salmon found in the Northern Pacific Ocean and rivers discharging into it. This species is a Pacific salmon that is primarily red in hue during spawning. They can grow up to 84 cm (2 ft 9 in) in length and weigh 2.3 to 7 kg (5–15 lb). Juveniles remain in freshwater until they are ready to migrate to the ocean, over distances of up to 1,600 km (1,000 mi). Their diet consists primarily of zooplankton. Sockeye salmon are semelparous, dying after they spawn. Some populations, referred to as kokanee, do not migrate to the ocean and live their entire lives in fresh water.

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Habitat

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Known from seamounts and knolls

Reference

Stocks, K. 2009. Seamounts Online: an online information system for seamount biology. Version 2009-1. World Wide Web electronic publication.

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