Observations on the spawning biology of Liza parsia (Hamilton-Buchanan) in the Cochin Estuary

B.M. Kurup, C.T. Samuel

Abstract



The maturity and spawning of Liza parsia in the Cochin Estuary, Kerala, India was studied from January to December 1979. The breeding season extends from October to May with peak spawning from December to April. Relatively high gonadosomatic values were observed from October to April after which a decrease was noticed upto June. Size at first maturity for female is around 129.0 mm S.L. and for male is around 120 mm S.L. The sex ratio was significantly different in January and February: the skewed sex ratios were due to the preponderance of females over males and then the mean ratio between male and female was found to be 1:1, 24. Fecundity of the species varied from 64,278 to 3,87,576 eggs and the relationship obtained was log F = 2.1951 + 3.3780 log L. The maximum number of mature fishes was observed from December to April when the estuary had nearly marine conditions. During the spawning periods the mean temperature ranged from 30 to 34 degrees C and salinity from 8 to 29 ppt in the area from where collection were made

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