Tui chub
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| Gila bicolor (Girard, 1856) |
The tui chub Gila bicolor is a cyprinid fish native to western North America. Widespread in many areas, it is an important food source for other fish, including the cutthroat trout.
The form and appearance of the tui chub is variable; many were originally described as different species by J. O. Snyder, but have since been reduced to subspecies. In general, the color is deep olive above and white below, with a smooth variation in shading along the sides, and a brassy reflection. Fins are olive and sometimes tinted with red. The pectoral fins are far forward and low on the body. Length has been recorded at up to 45 cm, but 25 cm is more typical.
Tui chub diet is varied; young fish eat mostly invertebrates, adding plant material and especially algae as they mature. Habits also vary by location and the fineness of the gill rakers, so for instance fine-rakered forms in Pyramid Lake feed more on plankton in open water than the coarse-rakered forms, who live near the bottom and eats more plants and algae. The largest individuals will eat other fish also.
Tui chubs are found in a variety of habitats, including anything from small streams to large lakes and reservoirs, and both high cold lakes (Tahoe) and warmer desert streams.
They spawn anywhere between late April and early August, depending on temperatures. In Pyramid Lake the peak season is June; males move inshore first, then congregate around arriving females in shallow water, preferring areas of heavy vegetation. The female scatters her eggs randomly over a wide area, where they are then fertilized by several males. The hatchlings remain in the heavy vegetation for the remainder of the summer. In Lake Tahoe some chubs spawn around stream mouths in July.
The tui chub's range includes the Lahontan and Central system of the Great Basin, as well as the Owens and Mojave Rivers. It is found in the Pit River and Goose Lake of the upper Central Valley, in the Klamath River system, and in the Columbia River drainage.
[edit] Subspecies
The exact number of subspecies is not known; Sigler & Sigler estimate as high as 16. Agreed subspecies include:
- Gila bicolor bicolor
- Gila bicolor isolata
- Gila bicolor mohavensis
- Gila bicolor obesa
- Gila bicolor pectinifer
- Gila bicolor snyderi
[edit] References
- Gila bicolor (TSN 163544). Integrated Taxonomic Information System. Accessed on 18 April 2006.
- William F. Sigler and John W. Sigler, Fishes of the Great Basin (Reno: University of Nevada Press, 1987), pp. 166-170
- "Gila bicolor". FishBase. Ed. Ranier Froese and Daniel Pauly. March 2006 version. N.p.: FishBase, 2006.
