Diagnostic Description
provided by Fishbase
Anterior spines of first dorsal fin much higher than those mid-way, giving the fin a strongly concave outline. Interpelvic process small and bifid. Body naked except for corselet and lateral line. Swim bladder absent. A large rounded protuberances on 31st and 32nd vertebrae. Color is generally iridescent blue with black dorsal markings composed of 3 to 5 horizontal stripes. Also with variable black or dark gray spots above the pelvic fins. Occasionally with extensive longitudinal stripes of light gray on belly; some individuals have few or no belly markings.
Migration
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Oceanodromous. Migrating within oceans typically between spawning and different feeding areas, as tunas do. Migrations should be cyclical and predictable and cover more than 100 km.
Morphology
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Dorsal spines (total): 1015; Analsoft rays: 11 - 12; Vertebrae: 37
Trophic Strategy
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Differential abundance by season suggests a pattern of north-south migrations, which are not yet fully understood. Like in the first quarter of the year, they are found off Central America northwards to the tip of Baja California. In the second quarter, they are abundant in the northern part of this range. In the third quarter, they are found in western Baja California and in the fourth, from Baja California to northern Peru.
Biology
provided by Fishbase
Occurs rarely where surface temperatures fall below 23°C. Its larvae are more frequently encountered at temperatures above 26°C and are practically confined to waters within about 240 miles off the mainland. Inhabits near the surface of coastal waters and offshore waters (Ref. 11035). Form multi-species schools with Thunnus albacares and Katsuwonus pelamis. An opportunistic predator which shares feeding pattern with other tunas and probably compete for food with other species such as yellowfin tuna, common dolphin, oriental bonito, among others.
Importance
provided by Fishbase
fisheries: minor commercial; gamefish: yes; price category: high; price reliability: reliable: based on ex-vessel price for this species
Euthynnus lineatus
provided by wikipedia EN
Euthynnus lineatus, the black skipjack tuna or black skipjack, is a species of ray-finned bony fish in the family Scombridae. It belongs to the tribe Thunnini, better known as the tunas.[2]
Description
E. lineatus has a total of 10-15 spines in its dorsal fins with the anterior spines of the first dorsal fin being much taller than the middle spines which gives this fin a concave outline. The anal fin has 11 - 12 soft rays and it has a vertebra count of 37. Its body is almost entirely scaleless except for the lateral line and a "corselet", and there is no swim bladder. It is generally iridescent blue in colour with black markings on its back made up of 3 to 5 horizontal stripes, as well as a variable amount of black or dark grey spots above the pelvic fins. Occasional specimens have extensive longitudinal stripes of light grey on their belly while other individuals have few or no such markings.[3]
Distribution
Eastern tropical Pacific from San Simeon, California to northern Peru and the Galápagos Islands.[4]
Fisheries
No targeted fishery exists for this species, though it is taken incidentally in the course of other fishery operations.[1]
Biology
E. lineatus is a pelagic and oceanodromous species which is rarely recorded where the surface temperature falls below 23 °C (73 °F). The larvae are most commonly found at temperatures higher than 26 °C (79 °F). It is generally distributed in surface waters which are no more than 386 kilometres (240 mi) from land. E. lineatus will form multi-species schools with yellowfin tuna and skipjack tuna. It shows opportunistic predatory behaviour, sharing its feeding pattern with other tunas, as well as dolphins and other large predatory fish, with which it also competes.[1]
The spawning of this species has a wide geographical and temporal distribution, and in the eastern tropical Pacific it has been shown to occur over a wide area from coastal to oceanic waters.[1]
References
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Euthynnus lineatus: Brief Summary
provided by wikipedia EN
Euthynnus lineatus, the black skipjack tuna or black skipjack, is a species of ray-finned bony fish in the family Scombridae. It belongs to the tribe Thunnini, better known as the tunas.
- license
- cc-by-sa-3.0
- copyright
- Wikipedia authors and editors
