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THE PROXIMATE AND MINERAL COMPOSITIONS OF FRESHWATER MUSSEL PARREYSIA CORRUGATA (MULLAR, 1774) FROM TUNGA RIVER IN THE WESTERN GHATS, INDIA

Shettigar Malathi & Seetharamaiah Thippeswamy

The proximate and mineral compositions of the freshwater mussel Parreysia corrugata (Mullar, 1774) inhabiting the upper reaches of Tungabhadra river in the Western Ghats, India have been analysed. Samples were collected from the river Tunga, at monthly intervals from March 2009 to February 2010. The average glycogen, protein and lipid contents in tissue were 9.62 mg g-1, 7.73% and 6.81% respectively. The concentrations of calcium, iron, manganese, sodium and potassium were 11.78, 6.33, 9.94, 3.33 and 4.56 mg g-1 respectively. Copper (0.06 to 0.16 mg g-1), zinc (0.37 to 0.55 mg g-1), magnesium (0.98 to 2.36 mg g-1) and iron (0.03 to 0.08 mg g-1) content showed minor variations. The multivariate statistical analysis of ambient environmental and biochemical variables in tissue of P. corrugata during the study period revealed a total of 5 components which accounted for 94.02% of total variance. The hierarchical cluster analysis using complete linkage showed 2 distinct groups of biochemical variables.