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Journal of Fisheries and Aquatic Science

Year: 2008 | Volume: 3 | Issue: 5 | Page No.: 320-327
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Authors

K. Sivashanthini

G.A. Charles

S. Shutharshan

Keywords

Research Article

Fecundity Studies of Gerres abbreviatus (Bleeker, 1850) From the Jaffna Lagoon, Sri Lanka

K. Sivashanthini, G.A. Charles and S. Shutharshan
The present study on fecundity of Gerres abbreviatus, Bleeker, 1850 (Pisces: Gerreidae) occurring in Jaffna lagoon, Sri Lanka covers annual fecundity, batch fecundity, spawning frequency and relationship between fecundity and various lengths of G. abbreviatus. The composite histograms based on the diameters of all oocytes at successive stages of maturation showed three modes in ovaries at stages 4, 5 and 6 in G. abbreviatus. Fecundity varied from 167610 to 3162280 ova for an animal with a total length of 149 to 280 mm. Annual Fecundity (AF) varied significantly between various size groups and showed perfect positive correlation with total length (TL, mm) and total weight (W, g). The relationships between length or weight and fecundity were statistically significant and best described with the simple linear regressions: AF = 19.678 TL3.563 and AF = 218.2 TW1.226. Linear regressions for logarithmic transformed data of annual fecundity and batch fecundity versus total length were computed. Comparison of these two regressions confirmed that G. abbreviatus spawn around three batches of eggs during a season.
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