Abstract
ABSTRACT We analyzed some aspects of the reproductive strategy of P. gracilis from the Cuautla River in central Mexico. A total of 491 specimens obtained through monthly samples were analyzed. There was an evident sexual dimorphism in the morphological features of P. gracilis. Overall sex ratio was 1:4.5 in favor of females. We found a direct relationship between the length and weight of the specimens (W=1.7−5 (1)3.07, r2=0.98, F, P<.001). The population structure of P. gracilis was grouped in six size classes, and the presence of only one modal group suggests that it has a short life span that lasts no more than a year or two. A difference in body size between the sexes at the onset of reproduction was noted. After analyzing 325 ovaries, six stages of maturation for females of P. gracilis were established. There was evidence of breeding activity throughout the year. In August and September the gonadosomatic index was highest (11.4% and 10.8% respectively). Body size was extremely variable, ranging from 1...
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