Study on the evolution of some morphological characteristics of Silurus glanis species in different development stages, farmed in Iasi County.

The current study tracked the evolution of some morphological characters of European catfish individuals, at an age of second (L1), third (L2) and respectively four summers (L3), gathered from a fishery in Iasi County. Catfish breed Silurus glanis, was the object of the present study being analysed a number of 30 individuals, 10 individuals for each of the third categories of age. Effectuation of corporal measurements and weighting for each age is done to appreciate the maintenance state of them and also their adaptability at the conditions assured by the environment. Based on the obtained and processed data were calculated the most representative indexes and maintenance coefficients. The obtained values were between 5.00-5.40 for profile index; 0.90-1.06 for Fulton coefficient; 1,84-1,90 for Kiselev index; 62,81-68,37 for thickness index and 17,28-19,52 for fleshy index which bring out the ratio of the head from the standard body length. Having in view the obtained results we can conclude that the analysed fishes had a good state of maintenance.