Benthos and substratum characteristics of prawn culture fields in and around the Cochin backwater
Date
1992Author
Aravindakshan, P.N.
Balasubramanian, T.
Devi, C.B.L.
Nair, K.K.C.
Gopalakrishnan, T.C.
Jayalakshmy, K.V.
Kutty, M.K.
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Benthic ecology of certain selected seasonal and perennial prawn fields in the Cochin Backwaters, Kerala, India was studied for understanding the environmental factors controlling the abundance of the major groups of macrobenthos which form significant component of food of prawns. Substratum characteristics, bottom temperature, salinity, pH, oxygen. Eh and organic carbon content of the mud are the parameters examined for identifying the governing factors controlling the benthic abundance in the areas investigated. However, seasonal fluctuations of the substratum characteristics were found to influence the qualitative and quantitative composition of the biota in areas 1, 2 and 4. In all the areas of the seasonal and perennial ponds, almost all the groups, particularly the most dominant ones, viz. polychaetes, amphipods and tanaidaceans were correlated with sand and clay, but negatively with silt. Generally the benthos showed little coexistence; rather they preferred independent existence
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