STUDY OF SOME MORPHOLOGICAL CHARACTERISTICS ONCORHYNCHUS MYKISS BREED FARMED IN SALMONID EXPLOATATIONS FROM MOLDOVA
C.E. Nistor, I.B. Pagu, Lenuţa Fotea, C. Radu, B. Păsărin
Study of morphological characters of fish by means of biometry is a frequently used method and consists in determining the variability of characters in isolated individuals or groups of individuals, by direct measurement, weighting and statistical processing of obtained data. Rainbow trout, Oncorhynchus mykiss, is characterized by intensively body growing superior to other salmonid breeds, being the breed which assimilates best the growing conditions of intensive trout farms. This breed is the object of the current study by analyzing of 40 individuals of third summer, 20 individuals in each batch (L1 and L2), in two trout farms from mountain area of Moldova. Based on the processing of the obtained data were calculated the most representative indexes and maintenance coefficients. The obtained values were between 3.58 at L1 batch and 3.83 at L2 batch for profile index; for Fulton coefficient 1.74 at L1 batch and 1.56 at L2 batch; for Kiselev index between 1.46 at L1 batch and 1.55 at L2 batch; for thickness index 44.44 at L1 batch and 45.61 at L2 batch; for fleshy index I 21.21 at L1 batch and 20.10 at L2 batch, and for fleshy index II 18.76 at L1 batch and 19.18 at L2 batch. After analyzing the obtained results we can conclude that the analyzed fish from both experimental batches presented a good state of maintenance.
Key words: morphological characters, Oncorhynchus mykiss, body indices, maintenance coefficients