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406 ..-.. E E 20 '-" .s:: C, 10 C. Q) ...J 50 COPEIA, 2000, NO.2 50 50 40 X. texanus age = 7 days 40 X. texanus age = 14 days X. texanus 40 age = 41 days 30 20 10 o o 30 60 90 120 50 30 20 10 o o 30 60 90 120 50 40 C. latipinnis age = 7 days 30 20 10 o o 30 60 90 120 50 40 30 20 10 o 20 40 60 80 100 50 30 40 C. latipinnis age = 14 days 40 30 20 10 o 20 40 60 80 100 Fig. 1. Changes in length (TL) over time of early life stage big-river fishes reared at three temperatures. Points represent mean responses of each species; ages are days posthatch at initiation of experiment. Circles denote 10 C, squares 14 C, and triangles 20 C. 10 o 20 40 60 80 100 50 G. cypha age = 7 days 30 20 o 20 40 60 80 100 50 G. cypha age = 14 days 40 30 20 ad 40 30 20 ~ 10 , , o 20 40 60 80 100 10 o 20 40 60 80 100 50 P. lucius age = 14 days 40 30 20 10 o 20 40 60 80 100 Time (days) Temperature shock.- There were no noticeable differences in behaviors among replicate tanks for any species, age, or temperature combina- tion in temperature shock tests. All 5-7 day G. CYPha larvae transferred from 20 C to 10 C im- mediately entered "cold coma," a condition characterized by an inability to maintain equi- librium and position in the water column (Cou- .~