INVESTIGATION OF THE PRODUCTIVE AND BIOCHEMICAL FEATURS OF FRESHWATER FISH, THE OBJECT OF AQUACULTURE III. BIOCHEMICAL CHGARACTERISTICS OF STOCKING MATERIAL FROM CARP (CYPRINUS CARPIO L.), BIG-HEAD CARP (aARISTICHTHYS NOBILIS RICH.) AND GRASS CARP (CTENOPHARYNGODON IDELLA VAL.)

Liliana Hadjinikolova

Abstract: The purpose of this investigation is to make a biochemical characteristics and evaluation as regards the readiness for wintering of stocking material from carp fish species (Cyprinidae) with economical significance, like carp (Cyprinus carpio L.), big-head carp (Aristichthys nobilis Rich.) and grass carp (Ctenopharyngodon idella Val.) by investigating their bacu-up systems and determining their species specificity. The parameters and limits of variation of 10 biochemical features in the period prior and after wintering have been determined. A similarity in the seasonal changeability of total serum proteins and of blood glucose, characterized by lower spring and higher autumn average values has been established. The carp and grass carp have differed with a more intensive accumulation of proteins (up to 19.5%) and fats (up to 3.79%) in the body and or total proteins in the blood serum (up to 40.2 g.l-1) during the rearing period and their more intensive exhaustion during the period of wintering as compared to big-head carp. The values and the limits of variation of their energy of the investigated fish species bodies have been established. The energy consumption during the wintering has been 22.4% for the carp, 16% for big - head carp and 24% for grass carp.

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Date published: 2023-02-22