118 
Jerry W. Nagel 
Fig. 3. Number of enlarged follicles related to total length in gravid females from 
Straight Creek. 
March 1978 length/frequency distributions suggests between-year varia- 
tion in growth rates for the Straight Creek population during this study. 
Reproduction. ^y[oni\\\y gonad weights for mature specimens are 
presented in Figure 2 and indicate that spawning occurred in early April. 
In 1978, weekly samples were taken during March and April to more 
precisely indicate the time of spawning. On 4 April all seven mature 
females were still gravid, but on 1 1 April all but 1 of 12 mature females 
were spent. Afternoon water temperatures on these dates were 14°C and 
12°C, respectively. 
