Author(s): Amrata Verma, Geetanjali Deshmukhe, AK Pal and AK Jaiswar

Abstract: Marine fishes are the largest living group of vertebrate. The present study was carried out to observe the abundance and seasonal distribution of the marine fish assemblage near Kalpakkam, Tamil Nadu. Fish diversity was evaluated from the by-catch landings from 30 km from north (Lat 12⁰35.566’ N, 80⁰15.138’ E) and south (Lat 12⁰31.514’ N, 80⁰02.263’ E) of the Kalpakkam coast, Tamilnadu, India. During the study period, 43 finfish species were recorded under 35 genera, 26 families and 7 orders. The families Leiognathidae and Sciaenidae were dominant with 4 species each followed by families Mullidae, Clupeidae and Synodontidae with 3 species each. The species, richness (d) ranged from 10.63 to 11.39, with lowest value in at Premonsoon N30 (PrM_N30) and highest in Summer S 15 (SuM_S15). Evenness (J') ranged from 0.9424 to 0.9875. The very even diversity was found at Premonsoon N 30 (PrM_N30) and very less even diversity recorded at summer S 15 (SuM_S15). The diversity Shanon-Weiner (H') ranged from 3.545 to 3.695. The maximum diversity was seen during at station S 15 (PrM_S15) Premonsoon and lowest diversity was also found at station S15 in summer season (SuM_S15). During post-monsoon station N 5 and N 15 recorded with similar diversity. The pH that indicated positive correlation with abundance of fish fauna but it was a weak correlation. If pH increase by 1% than fish abundance increases by 0.26%. Abundance was negatively correlated with temperature; by 1ºC increase in temperature a decrease of 0.42% abundance was seen. Salinity was negatively correlated with all parameter except temperature. The pH showed weak positive correlation with NH₄^-N. Temperature showed weak positive correlation with NH₄ ^-N and NH₃ ^-N. The NH₄ ^-N showed very weak positive correlation with pH and temperature. The NH₃^-N showed very weak positive correlation with NH₄ ^-N.

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