Early larval development of edible oyster Crassostrea madrasensis (Perston)

Samuel, D (1982) Early larval development of edible oyster Crassostrea madrasensis (Perston). In: Proceedings of the Symposium on Coastal Aquaculture, Part 2, MBAI, 12-18 January 1980, Cochin.

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Abstract

Early larval development of edible oyster Crassostrea madrasensis (Perston) mature male and female edible oyster Crassostrea madrasensis selected from the Tuticorin oyster farm were stripped and the eggs were artificially fertilized in glass containers. 91.5 to 92.2 percentages of eggs underwent successful fertilization and the larvae were reared up to umbo stage in one experiment. The size of the mature egg varied from 49 to 59 µ,. A method of filtering and washing the eggs using centrifugation was devised as the eggs could not be retained even by the finest sieve (nylobolt bolting cloth 30 HD) available. The fertilized eggs were cultured in different vessels of size ranging from 1 liter to 80 liters containing filtered ultraviolet treated sea water. 85% of the fertilized eggs successfully reached the straight hinge-stage in 18 to 24 hours. The umbo stage was reached in 11 days, provided Chlorella salina was supplied as food. Antibiotics were used to control other organisms developing in the culture and multivitamins as a source of nutritional supplement

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