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Reproduction by the endangered cui ui chasmistes cujus in the lower truckee river nevada california usa



Reproduction by the endangered cui ui chasmistes cujus in the lower truckee river nevada california usa



Transactions of the American Fisheries Society 112(6): 788-793



Adult spawning behavior and emigration of larvae of the endangered cui-ui C. cujus were studied in a natural side channel of the lower Truckee River. External radio-tags placed on 8 fish apparently did not affect spawning behavior. Cui-uis spawned in clusters of 2-7 fish; usually a single female was flanked by 2 males. Each spawning act lasted 3-6 s and individual fish spawned numerous times. The most active tagged male and female spawned at least 294 times and 114 times, respectively. Individual females broadcast eggs over an area of up to 50 m2. Males spawned over a 4- to 5-day period and females over 2.5-4 days. Most spawning occurred at night in water depths ranging from 9-43 cm, water velocities ranging from 23-87 cm/s and temperatures of 12.degree.-17.degree. C. The preferred spawning substrate was gravel. Peak emergence and out-migration of cui-ui larvae occurred 14 days after peak spawning.

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