. Bulletin. Science. 70 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES Table 1. Sex Minimum Maximum Mean St. dev. Males Standard length (mm) Weight (g) Females Standard length (mm) Weight (g) Undetermined Standard length (mm) Weight (g) 331 338 43 even with mean weight there was not significant differences between sexes with ; 95%; - 669; t - ; sig. level - X 109. The von Bertalanffy equations describing theoretical growth of males and fe
. Bulletin. Science. 70 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES Table 1. Sex Minimum Maximum Mean St. dev. Males Standard length (mm) Weight (g) Females Standard length (mm) Weight (g) Undetermined Standard length (mm) Weight (g) 331 338 43 even with mean weight there was not significant differences between sexes with ; 95%; - 669; t - ; sig. level - X 109. The von Bertalanffy equations describing theoretical growth of males and fe- males of the fantail sole are shown in Fig. 4. After age 3 (210 mm), females were consistently longer and heavier than males due to differences in reproductive condition or general robustness of fish, although the rate of growth (K) for the two sexes was similar (Fig. 5). However females attained an older age and longer length than males. For the estimation of mortality rates the best results were obtained by the Beverton and Holt (1959) method (Z = ; M = ; F = ) (Fig. 6). Although these populations of X. liolepis are considered exploited, the natural mortality coefficient (M) was taken as the (K) value, as an index, obtained from the von Bertalanffy growth equation (Beverton and Holt 1959). These results suggest that even though fantail sole is not a target species in the commercial fishery, the rate of fishing mortality is higher than natural mortality, possibly due to the large bycatch of flatfish, including fantail sole, in the shrimp fishery. Chavez and Ramos-Padilla (1974) mentioned that along the western coast of Baja Cali- fornia between 25 and 100 m depth that of tons caught tons were brown 1600 1400 ~ 1200 ^ WD ^ 1000 F Females Males F-W= x 10"6SLA1** ; n=375 . r = M-W= 10-5SL3-1215; n- 380; r = /'. Fig. 3. 150 200 250 300 350 400 Standard length (mm) Length-weight relationships of male and female Xystreurys liole
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