Elena Ciornea

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Elena Ciornea, Gabriela Dumitru

The aim of this paper was the biometric study (total length, standard length, the head's length, the maxim height of the body, the circumference and the length of digestive tube), the gravimetric study (body's weight and digestive tube's weight) and the biochemical study (amylase and digestive proteinases activity) for three-summer old Ctenopharyngodon idella representatives, from a systematic arrangement. For biometric and gravimetric analysis were used the classical methods knew in the literature of the field, and the biochemical data were obtained through Métais-Bieth colorimetrical method, respectively, the method with the reactive Folin-Ciocalteu, all the obtained values being subsequently statistically processed and interpreted, calculating a large variety of statistical indices (the average, the error and standard deviation, the variance, the amplitude, the upper and lower limits of confidence intervals, variance coefficient and average's precision coefficient), the correlation and regression relations from a series of character pears (the standard length-body's weight, the standard length-head's length, the standard length-the height, the standard length-the digestive tube's length, the weight of the body-the digestive tube's weight), as well as possible interindividual differences or similarities with Anova test. The obtained results evidences an intense rhythm of development for the individuals of this species, between all the pairs of investigated characters existing positive correlations, the enzymatic activity at digestive tube's level being also extremely underlined.

Key words: grass carp, regression, amylase, proteinases