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Reproduction by the Endangered Cui‐ui in the Lower Truckee River
Author(s) -
Scoppettone G. Gary,
Wedemeyer Gary A.,
Coleman Mark,
Burge Howard
Publication year - 1983
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1983)112<788:rbteci>2.0.co;2
Subject(s) - endangered species , fish <actinopterygii> , fishery , reproduction , biology , larva , emigration , ecology , geography , archaeology , habitat
Adult spawning behavior and emigration of larvae of the endangered cui‐ui Chasmistes cujus were studied in a natural side channel of the lower Truckee River. External radio‐tags placed on eight apparently did not affect spawning behavior. Cui‐uis spawned in clusters of two to seven fish; usually a single female was flanked by two males. Each spawning act lasted 3–6 seconds, 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 m 2 . Males spawned over a 4–5‐day period, and females over 2.5–4 days. Most spawning occurred at night in water depths ranging from 9 to 43 cm, water velocities ranging from 23 to 87 cm/second, and temperatures of 12–17 C. The preferred spawning substrate was gravel. Peak emergence and out‐migration of cui‐ui larvae occurred 14 days after peak spawning. Received September 7, 1982 Accepted August 5, 1983