. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GROWTH, RANK, AND MATURATION OF PRAWNS 381 chambers and no visible gonads: and (b) ripening females, with narrow brood chambers but having visible gonads (Sagi and Ra'anan, 1985). These first groups were im- mature as males never placed spermatophores upon them. Mature females were either (c) ovigerous with enlarged brood chambers bearing eggs or (d) post-ovigerous, with enlarged brood chambers but no visible gonads. Thus, the appearance of an enlarged brood chamber operationally defined the onset of maturation. Males were c
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GROWTH, RANK, AND MATURATION OF PRAWNS 381 chambers and no visible gonads: and (b) ripening females, with narrow brood chambers but having visible gonads (Sagi and Ra'anan, 1985). These first groups were im- mature as males never placed spermatophores upon them. Mature females were either (c) ovigerous with enlarged brood chambers bearing eggs or (d) post-ovigerous, with enlarged brood chambers but no visible gonads. Thus, the appearance of an enlarged brood chamber operationally defined the onset of maturation. Males were classified according to their morphotypic stage within the male social system (Ra'anan and Cohen, 1985;Kurisrt al, 1987). Statistical analysis Analysis of male growth characteristics. For each male, body weight was plotted over time. Males were separated into three categories: (1) individuals that were initially SM and remained in this morphotype until the end of the observation period; (2) SM individuals that transformed to the OC morphotype during the observation period; and (3) individuals, which were initially OC males, that trans- formed to the BC morphotype. On each sampling date, mean weight, standard deviation (SD), and the coefficient of variation, PCV, were calculated for each group of males. As the size distribution was skewed, the median body weights for each of these groups of males on each date were used to generate growth curves. Daily growth rates (± standard error of the mean) were described using the instantaneous rate of growth (also called specific growth rate or relative growth rate), G. where G = 100(1 nW, - 1 nW0 )/t, with W0 and W, being, respectively, the weights recorded initially and after t days (Fisher, 1946; Ricker. 1975; Kaufmann, 1981). This per- mitted the comparison of growth rates at different body sizes. The variance of the growth curve parameters was estimated for each morphotype according to Kaufmann (1981). The regression of G on InW was c
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
