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The sand lobster Thenus orientalis formed a minor fishery supplementing the
trawl catches along Chennai coast. The annual landings of the species during
1982-1999 varied between 6.7 and 114.6t, with the catch trend showing gradual
progress leading to sharp rise in 1991-95 followed by moderate decline. Main
fishery season extended over September-February, with peak abundance in
monsoon months, October-November. Females were slightly larger among
population, as the mean-size was 156.9 mm, against 153.6 mm for male. The L”
was 298.25 mm and K, 0.2967/yr for female and 288.91 mm and 0.3216/yr for
males, which worked out the growth performance of 4.422 and 4.426 for the
respective sex. The overall sex-ratio of M:F was 46.3:53.7 and the minimum
size at maturity of female was 105.5 mm. The species showed two major spawning
spells around February-March and June-August and peak recruitments appeared
during January-February and May-July
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