. Bulletin. Science. COLOR PATTERNS IN KELP BASS 51. Fig. 3. Percent of OS males (bar graph) and gonosomatic index (GSI, line graph) from 365 male kelp bass (Paralabrax clathratus) collected from May 2001 to April 2002, by month of capture. Values for GSI are ± 1 SD. Numbers represent monthly sample sizes. Data were grouped to show monthly variations over a single year. df = 8, P < ). This coloration was not observed in any individuals collected from December 2001 to April 2002. Calico phase individuals were observed at both transect sites throughout the study period (Figure 4). OS phas
. Bulletin. Science. COLOR PATTERNS IN KELP BASS 51. Fig. 3. Percent of OS males (bar graph) and gonosomatic index (GSI, line graph) from 365 male kelp bass (Paralabrax clathratus) collected from May 2001 to April 2002, by month of capture. Values for GSI are ± 1 SD. Numbers represent monthly sample sizes. Data were grouped to show monthly variations over a single year. df = 8, P < ). This coloration was not observed in any individuals collected from December 2001 to April 2002. Calico phase individuals were observed at both transect sites throughout the study period (Figure 4). OS phase males were observed at both transect sites from May to July 2002, where they increased in frequency over this period (Figure 4). Monthly variations in the proportion of OS phase individuals observed on tran- sects were significantly different than expected at random for both the Intake Pipes site (Pearson chi-square goodness of fit, x2 = , df = 7, P < ) and the Pumpernickel Cove site (Pearson chi-square goodness of fit, x2 = , df = 7, P < ). The estimated spawning season based on GSI and maturity data showed a pattern very similar to the monthly frequency of collected OS phase males. Mean monthly GSI of males (Figure 3) and females (Figure 5) remained low from January to April. GSI of both sexes increased from April to June, peaked in June, and steadily declined throughout the summer and fall. GSI values of males and females were lowest in February and December. Monthly variations in male GSI (Kruskal-Wallis, KW = , df = 8, P < ) and female GSI (Kruskal- Wallis, KW = , df = 8, P < ) were significant. Males and females containing visibly ripe gonadal tissue were collected from May to October, and over 93% of adults collected from June to August were visibly ripe. Females with hydrated ovaries were collected from June through September, and the highest frequency of hydrated females occurred in July (Figure 5). The mean GSI of
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