FISHERY BULLETIN: VOL. 69, NO. 1 



Table 6. — GSI of young female Bairdiella icistia after 

 five injections of various concentrations of salmon pitui- 

 tary extract over a 10-day experimental period (4-XI- 

 14-XI-69). 



ever, the results (Table 6) do indicate a general 

 increase in GSI corresponding to dose. That 

 these fish were not too small to respond to treat- 

 ment is indicated by the high GSI observed in 

 similar sized fish captured in Salton Sea during 

 the breeding season (Table 2, group 3). It is 

 possible that the rather small response observed 

 was due in part to the fact that the fish were 

 handled frequently and did not feed readily dur- 



ing the course of the experiment. This test 

 would probably be more successful if carried 

 out with 30- to 50-g fish kept under short-day 

 conditions at 14° C. 



GONAD HYDRATION 



Water Uptake Following Hormone Injections 



Weight gain on various hormones. — Short 

 term changes in body weight occurred 1 to 2 days 

 following the injection of various hormones. 

 This weight change was recorded as a percent 

 of the initial total body weight (Table 7) and 

 was found to vary from slightly negative values 

 to positive values of over 13 Sr of the body 

 weight. Single injections were given, and fish 

 were weighed prior to, and 30 hr after, injection. 

 With few exceptions, the fish showed little or 



Table 7. — Effects of hormones of GSI of Bairdiella icistia at 30 hr post-injection. 



or ovulate.) 



(1 = did, = did not hydrate 



168 



