Laserfiche WebLink
<br />o <br />C.> <br />N <br />....:.... <br />t- <br />O <br /> <br />nonspawners died because it had jumped out of the tank during the night. The mortality of three <br /> <br />nonspawners was probably due to complications from surgery, two of the fish received radio <br /> <br />transmitters and the other fish was a sham control for the surgical implantation procedure. The <br /> <br />last mortality occurred 8 days after the study ended and may have been partly due to an injury it <br /> <br />received during the last growth sampling period, These results indicated that the dietary and <br /> <br />waterborne selenium concentrations tested did not adversely affect the survival of adult Colorado <br /> <br />pikeminnow, <br /> <br />Initial size <br /> <br />Analysis of growth data at day 0 showed that there were no significant differences in <br /> <br />initial weight, total length, or condition factors of adults among treatments (Table 4), Size <br /> <br />differences between the sexes were obvious and significant; females were about 1.7 times <br /> <br />heavier (F=7I.95, P<O,OI) and 1.2 times longer (F=I41. 13, P<O,OI) than the males, Average <br /> <br />condition factors at day 0 were also significantly higher in females (F=8.l4, P=O,04) compared <br /> <br />to the males. <br /> <br />Growth <br /> <br />Analysis of growth data revealed that there were no differences in weight, total length, or <br /> <br />condition factors of adults among treatments and no significant interaction of treatment with sex, <br /> <br />day, or sex and day for these growth parameters during the 245 day study (Table 5), However, <br /> <br />there was a significant effect of sex and day on all three growth parameters and there was a <br /> <br />significant interaction between sex and day for weight This interaction indicated that changes in <br /> <br />weight over time were different for females and males, Because there were no treatment effects <br /> <br />or any significant interactions with treatment, the data were pooled across treatments to examine <br /> <br />differences in growth over time. Mean growth metrics for fish in each treatment are given in <br /> <br />Appendices C-E. <br /> <br />28 <br />