MORPHOLOGICAL AND BIOCHEMICAL STUDY OF THE DIGESTIVE TUBE IN COMMON CARP, PRUSSIAN CARP AND BIGHEAD CARP

The present paper proposed to realize the comparative morphological and biochemical study of the digestive tube for two-summer old Cyprinus carpio, Carassius auratus gibelio and Aristichthys nobilis representatives, grown in a supervised system, using for biometrical and gravimetrical analysis classical methods, and for alanine- and aspartate-aminotransferase, the colorimetric method with 2,4-dinitrophenylhydrazine. The resulted data were processed and interpreted statistically, obtaining a whole tableau of statistical indices which reflects to the best the real situation. In parallel, were analyzed the regression equations drawn on the bases of the Pearson parametrical correlation index, pointing each time on one hand, the degree of reciprocal influence of the two pears of compared variables, and on the other hand the proportion in which the respectively relation is respected. The researchʹs results evidenced, for all the three cyprinid species taken in this study, positive correlations for both pears of variables (the bodyʹs standard length-the digestive tubeʹs length, the bodyʹs weight-the digestive tubeʹs weight), the registered transaminasic activity presenting higher values for common carp and bighead carp, the minimal level registering in both cases for alanine- so as for aspartate-aminotransferase in Prussian carp (9.82 UE/g/min., respectively, 8.02 UE/g/min.).