Influence of Diets with Different Amounts of Cotton Seeds and Reduced Contents of Protein on Some Biometric and Biochemical Parameters of Carp (Cyprinm carpio L.)

L. HADJINIKOLOVA and R. ATANASOVA
Institute of Fisheries and Aquaculture, Varna, Branch Plovdiv, BG - 4003 Plovdiv, Bulgaria

Abstract

HADJINIKOLOVA, L. and R. ATANASOVA, 2006. Influence of diets with different amounts of cotton seeds and reduced contents of protein on some biometric and biochemical parameters of carp (Cyprinus carpio L.). Bulg. J. Agric. Sci., 12: 329-336

The aim of the research is to trace out the influence of diets with three levels of un-defatted cotton seed and reduced protein content on some biometrical and biochemical parameters in one-summer old carp (Cyprinus carpio L.). The values of the parameters that have been traced out (Fulton's condition coefficient, Weight index of the liver, Bactericidal activity of the blood serum, Total protein, Blood glucose, water, protein, fat and minerals) reflect the specific balance of the plastic and energy substances as a result of the feeding, deviations from the physiological norms of carp have not being taking into consideration.
The more the non-protein energy in the diets increases by means of the inclusion of 56% cotton seed and level of crude protein 23%, the greater the share of the deposited fat in the body of one-year-old carp, of the blood sugar and the relative weight of liver becomes. Upon reducing the level of crude protein in the diets from 29 to 23%, decreasing of the contents of the total protein in blood serum with 18.3% and of the relative share of proteins in carp's body from 3 to 7% is noticed. At the above protein levels the fish had a good resistance. As far as the analyzed fish are concerned modifications in colour and consistency of liver have not been registered.

Key words: carp, cotton seed, diet, blood glucose, total protein, chemical composition of the body.