Seasonal Variation in Proximate and Mineral Composition of Koi, (Anabas testudineus, Bloch 1792)

The variation in proximate composition and mineral content was determined in relation to season and body weight of Koi (Anabas testudineus). The samples were collected from different places and seasons; further fishes were grouped as small (10–50 g) and big (52–150 g). The protein content was significantly higher (P<0.05) in small fish during January-April season vis-à-vis other groups. The fat content of the species was significantly (P<0.01) higher during September-December and January-April. The ash content was significantly higher (P<0.01) in small fish during May-August when compared to big fish. The moisture was significantly (P<0.01) higher and fat content was significantly lower during May-August in respective body size of Koi. Calcium content was significantly higher (P<0.01) in small fish during May-August whereas the phosphorus content was significantly higher (P<0.01) during January-April and September-December, irrespective of their body weights. Sodium and potassium content were significantly (P<0.01) higher in small fish during January-April. The zinc content is also higher in small fish during January-April. The results indicated that Koi is a good source of protein, fat and minerals.