Exploited fishery resources of the Vembanad Lake. Part III. Clam fisheries

B.M. Kurup, M.J. Sebastian, T.M. Sankaran, P. Rabindranath

Abstract



The molluscan fishery of the Vembanad Lake, Kerala, India is exclusively sustained by the black clam Villorita cyprinoides (Gray). The exploited quantity of black clam from the lake during July 1988 to June 1989 is estimated as 7025.06 tonnes. The average annual catch per hectare of the lake is worked out at 333.72 kg whereas that of clam bed area as 4490 kg. The clam landing is registered during the months of May and October. 47.43% of the clam exploited from the lake is accounted from the southern sector (Thanneermukkom to Alleppey) and 52.57% from the northern sector (Cochin to Thanneermukkom). The annual catch/ha is 296.86 kg in the north and 386.99 kg in the south. The catch/clam bed area in the two sectors are of the order of 5392.42 kg/ha and 3786.39 kg/ha in the northern and southern regions respectively. 5.51% of the northern sector and 10.22% of the southern sector sustained perennial clam beds. The clams obtained from the southern region has a modal size class of 20-24 mm in contrast to 15-19 mm in the northern sector. The exploited clam resources of the lake showed a declining trend when compared to previous estimates

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