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By Jacob M. Jaworski

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Aspersa at one time varies from about 30 – 120, averaging 86 and the total fecundity is estimated at 400 – 450 eggs annually. 5 days for M. 7 days for E. vermiculata during the two seasons respectively. Staikou and Lazaridou (1990) decided that, 14% of M. cartusiana individuals reached maturity one year after hatching, while the majority reached maturity and laid eggs two years after hatching and all snails died after the reproductive period. 3 days after adulthood for M. cartusiana and E. vermiculata during the two seasons respectively; while, (Staikou and Lazaridou, 1990) found that, the sexual maturity of M.

Omena, EP; Amaral, A C Z. (2000). Population dynamics and secondary production of Laeonereis acuta (Treadwell, 1923) (Nereididae : Polychaeta). Bulletin of Marine Science, 67,421-432. Pauly, D; Munro, J L. (1984). Once more on the comparison of growth in fish and invertebrates. Fishbyte, 2, 21. Pauly, D; Moreau, J; Abad, N. (1995). Comparison of age structure and length-converted catch curves of brown trout Salmo trutta in two French rivers. Fisheries Research, 22,197-204. Rios, EC. (1994). Seashells of Brazil.

The data are compared in paired Fisher t-test and symbols indicate values that are significantly different from controls. 001. RESULTS Median lethal concentration for 96 hours of sodium arsenite in adult S. serrata was 15 ppm in static water environment. 8 x 105 cells / ml (Figure 1). Alteration in hemocyte density was recorded against 1, 2 and 3 ppm of sodium arsenite for 1, 2, 3, 4, 7, 15 and 30 days. The lowest and highest THC was accounted for the specimen exposed to 1 ppm of sodium arsenite for 3 and 30 days respectively (Figure 2).

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