Abstract
The fish (Catla catla, Labeo rohita and Cirrhina mrigala) muscle protein profile viz. sarcoplasmic, myofibrillar and stromal proteins has been determined after one year pond fertilization trial under polyculture system. Fish were reared under five nitrogen levels (0.10, 0.13, 0.16, 0.19 and 0.22 g N) from broiler droppings and a control without additives. The present investigation reveals significant interactions between treatments and species for sarcoplasmic, myofibrillar and stromal proteins. Higher concentration of sarcoplasmic proteins in Catla catla corresponded with the comparative decrease of myofibrillar proteins. The correlation coefficients between sarcoplasmic and myofibrillar proteins of the three fish species were significantly negative while the same between stromal and myofibrillar proteins were negatively significant for Cirrhino. mrigala only. This shows that stroma would increase at the expense of myofibrillar proteins, in Cirrhina mrigala. The correlation between sarcoplasmic and stromal proteins was positively significant in Cirrhina mrigala and negatively so (P
