Hesperoleucus symmetricus és una espècie de peix de la família dels ciprínids i de l'ordre dels cipriniformes.
Als Estats Units és depredat per Ptychocheilus grandis.[6][7][8]
És un peix d'aigua dolça i de clima temperat.[4]
Es troba a Nord-amèrica: Califòrnia (Estats Units).[4][9][10][11][12][13]
Hesperoleucus symmetricus és una espècie de peix de la família dels ciprínids i de l'ordre dels cipriniformes.
The California roach (Hesperoleucus symmetricus) is a cyprinid fish native to western North America and abundant in the intermittent streams throughout central California. Once considered the sole member of its genus, it has recently been split into a number of closely related species and subspecies.[2]
These fishes are of a relatively chunky body shape, with a largish head and large eyes, but a small mouth oriented downwards. The color is a darker grayish-bluish above, and a dull silver underneath. During the breeding season, red-orange patches appear on the chin, operculum, and at the bases of pectoral, pelvic, and anal fins. The smallish dorsal fin has 7-10 rays, while the anal fin has 6-9 rays. They never get large, the maximum known being about 11 cm.[3]
Mainly bottom feeders, filamentous algae are the main part of their diet, followed by aquatic insects and crustaceans. They will also opportunistically eat insects and crustaceans at the surface. In turn, they are eaten by other fish, in particular green sunfish.
Spawning occurs mainly from March through June. They move into shallow, flowing water, over bottoms covered with small rocks, and form up into schools. Females lay a few eggs at a time, eventually putting down from 250 to 900 eggs each. The adhesive eggs are laid in crevices, where they stick to the rocks, and then the males fertilize them. The fry continue to dwell in the crevices until they are strong enough to swim actively.
California roaches seem to be resilient fishes that take advantage of the intermittent waters of central California under conditions too difficult for other fishes. As the springtime streams dry up in summer, roaches accumulate in large number in pools, which may be alkaline, hot (up to 95 °F), and low in oxygen. They also seem to cope well with sewage-polluted waters.
The distribution of the species complex comprises the Sacramento River/San Joaquin River drainage, including Pit River and Goose Lake, and many of the small coastal streams (Russian River, Pajaro River, Salinas River, Adobe Creek, Permanente Creek, etc.). Populations in southern California and in Warner Valley, Oregon, may be introductions.
In a recent revision of the California roach, previously considered a single species, it was split into four distinct species and two additional subspecies:[2]
The California roach (Hesperoleucus symmetricus) is a cyprinid fish native to western North America and abundant in the intermittent streams throughout central California. Once considered the sole member of its genus, it has recently been split into a number of closely related species and subspecies.
Hesperoleucus symmetricus es una especie de peces de la familia de los Cyprinidae en el orden de los Cypriniformes.
En los Estados Unidos es depredado por Ptychocheilus grandis.
Es un pez de agua dulce y de clima templado.
Se encuentran en Norteamérica: California (Estados Unidos ).
Hesperoleucus symmetricus es una especie de peces de la familia de los Cyprinidae en el orden de los Cypriniformes.
Hesperoleucus symmetricus Hesperoleucus generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Cyprinidae familian.
Hesperoleucus symmetricus Hesperoleucus generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Cyprinidae familian.
Amerikinės kuojos (Hesperoleucus) – karpinių (Cyprinidae) šeimos žuvų gentis.
Amerikinės kuojos (Hesperoleucus) – karpinių (Cyprinidae) šeimos žuvų gentis.
Hesperoleucus symmetricus is een straalvinnige vissensoort uit de familie van de eigenlijke karpers (Cyprinidae).[1] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1854 door Baird & Girard.
Bronnen, noten en/of referenties
昏白魚（学名：Hesperoleucus symmetricus）为輻鰭魚綱鯉形目鲤科的其中一種，分布於北美洲美國加州薩克拉門托河-聖約昆河流域，棲息在小型岩石溪流或水池，體長可達11公分。
这是一篇與鯉形目相關的小作品。你可以通过编辑或修订扩充其内容。 
