An assessment on the influence of salinity in the growth of black clam (Villorita cyprinoides) in cage in Cochin Estuary with a special emphasis on the impact of Thanneermukkom salinity barrier
Journal Title: Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society - Year 2009, Vol 2, Issue 3
Abstract
Regular tidal flow, estuarine circulation and other allied hydrographical parameters in the Cochin Estuary has changed due to regular closure and opening of Thanneermukkom bund and entry of saline water in to the estuary. Temperature, salinity and bottom sediment texture are found to be the important factors significant for the growth and survival of bivalves. The environmental condition on different parts of the estuary especially at station II (south of bund), station IV (north of bund) and station V (near to bar mouth) showed a clear and distinct variation in all the hydrographical parameters due to the existence of Thanneermukkom bund and bar mouth. At stations II the frequency of temperature fluctuation was high and the dominant environment was freshwater when compared with station IV. Sediment texture at station II was sandy silt and at station IV was silty sand. At station V the dominant condition was saline and sediment texture was clayey in nature. A higher salinity was noted throughout the study period at station V. At station II the annual average growth was 8.48 mm; at station IV it was 15.15 mm and at station V it was 9.64 mm. Moderate level of salinity is found to be a favourable factor for the growth of Villorita cyprinoides. Growth rates of smaller clams were found to be higher than larger clams.
Authors and Affiliations
Aloorkalarickal Arun
Keywords
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