The biology of grey mullets in a tropical lagoon in Sri Lanka. 1. age and growth

M.J.S. Wijeyaratne, H.H. Costa

Abstract



The age and growth, coefficients of condition and length weight relationships of seven species of grey mullet viz. Liza subviridis (Valenciennes), L. macrolepis (Smith), L. tade (Forskal), L. vaigiensis Quoy and Gaimard, Mugil cephalus Linnaeus, Valamugil buchanani (Bleeker) and V. cunnesius (Valenciennes) were studied in Negombo lagoon, Sri Lanka. M. cephalus showed the highest asymptotic length of 897 mm while the lowest value of 300 mm was calculated for V. cunnesius. Allometric growth was evident in all species except in M. cephalus and the females of L. tade. Statistically, significant differences in the length weight relationship of the two sexes were observed in the case of L. subviridis, L. macrolepis, L. tade, M. cephalus and V. cunnesius. In these species, the coefficient of condition of the females were found to be significantly higher than those of the males

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