caa a22 4500 477115888 CHVBK 20180405111622.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF00005222 doi (NATIONALLICENCE)springer-10.1007/BF00005222 Bestgen Kevin Larval Fish Laboratory, Department of Fishery and Wildlife Biology, Colorado State University, 80523, Fort Collins, CO, U.S.A. aut Growth, survival, and starvation resistance of Colorado squawfish larvae [Elektronische Daten] [Kevin Bestgen] Synopsis: Growth and survival of Colorado squawfish, Ptychocheilus lucius, larvae under fluctuating 18, 22, and 26° C (5° C diel fluctuations) and constant 18, 22, 26° C, and 30° C temperature conditions and ration size corresponding to 12.5, 28,64,142, 320 brine shrimp nauplii fish−1 day−1 determined from laboratory experiments. Growth was optimal at 31° C and high at temperatures of 26° C to 30° C, at the highest food abundance. Lowest growth was under lowest food rations and highest temperatures. Growth of Colorado squawfish larvae declined substantially at temperatures < 22° C. Neither growth nor survival was significantly different between fluctuating or constant regimes. Survival of Colorado squawfish larvae was highest (95%) at 26.2° C and 235 nauplii fish−1 day−1 and high at temperatures of 20 to 30° C with food abundance > 180 nauplii fish−1 day−1. Survival was lowest when food abundance was low and temperature was high. Highest mortality occurred more than 20 days after experiments began and mortalities occurred sooner in higher than lower temperatures. Colorado squawfish larvae denied food for 5, 10, or 15 d after first feeding could have begun (6 d), had survival greater than 87 % which was equivalent to continuously fed controls. Survival of fish denied food for 17.5 d after feeding could have begun declined from 84% before feeding to 57% after feeding. Point of no return was estimated between 17.5 and 20 d. Colorado squawfish have relatively high starvation resistance. Low, stable flows that simulate natural hydrographs may enhance growth, survival, and recruitment of early life stages of Colorado squawfish by increasing water temperature and food abundance in regulated rivers of the Colorado River basin. Kluwer Academic Publishers, 1996 Ptychocheilus lucius nationallicence Cyprinidae nationallicence Endangered nationallicence Colorado River nationallicence Temperature nationallicence Food abundance nationallicence Regulated river nationallicence Fish larvae nationallicence Critical period nationallicence Point of no return nationallicence Environmental Biology of Fishes Kluwer Academic Publishers 46/2(1996-06-01), 197-209 0378-1909 46:2<197 1996 46 10641 https://doi.org/10.1007/BF00005222 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00005222 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Bestgen Kevin Larval Fish Laboratory, Department of Fishery and Wildlife Biology, Colorado State University, 80523, Fort Collins, CO, U.S.A aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Kluwer Academic Publishers 46/2(1996-06-01), 197-209 0378-1909 46:2<197 1996 46 10641 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer