Journal of the Marine Biological Association of India

Observations on the biology of Hemirhamphus gaimardi (Cuvier and Valenciennes) of Pulicat Lake.

Volume 22 Issue 1&2

Munawar Sultana, K. Raman, P. M. Abdul Kadir, S. Srinivasagam and G. R. M. Rao

Abstract

Biology of Hemirhamphus gaimardi of Pulicat Lake was studied during the period 1978-80. Separate as well as combined length-weight relationship of males and females were found out. Relative condition was estimated separately for males and females. Fluctuations in the Kn value at different lengths and in different months were studied. Sex ratios were worked out for different months, years and length groups. The smallest fully mature female fish measured 102 mm in length and 50% level of maturity was noticed at 138 mm. The ovary stages were classified based on colour, appearance and size of ova. Multiplicity of modes in the frequency curves of ova diameters indicates that this fish is a continuous spawner releasing eggs in batches. The structure of a ripe egg has been described. Fecundity of the species in the size range 102-161 mm varied from 555 to 9065. Relationship of fecundity and length of fish and ovary weight, and the relationship between fish weight and ovary weight have been studied. Studies on age and growth have revealed that the fish during the first year, grows to about 100-120 mm in length. Body length-scale length relationship has been worked out. Fishery in the lake has also been studied. The fish is caught in far greater numbers during the months of April, June, August, September and November especially from the northern sector of the lake which serves as its breeding and feeding ground.

Date : 31-12-1981