The use of pre-ongrowing feeds in the adaptation of sea bass (Dicentarchus labrax,L. 1758) fry to net cages

In this study, which was planned to monitor the growth and development of sea bass (Dicentrarchus labrax, L., 1758) obtained from a hatchery belonging to a private hatchery at random and with the same characteristics in the breeding medium in the net cages, the fry - young individuals in the transition period between 2-50 g were examined. In this study, which was carried out in a private hatchery located in Bodrum Göltürkbükü locality of Muğla province, 6 HDPE net cages with 20 meters diameter and 15-17 meters depth were used to form two parallel for each group. Approximately 100 thousand fishes with an average weight of 5±0,94 grams were stored in each net cage. Accordingly, 52% HP-13% HY A group, 52% HP-15% HY B group and commercially used 52% HP-18% HY content of the control group were evaluated as group C. The study lasted 90 days between July 2015 and September 2015. At the end of the study, live weight gain in group A fish was 43±0,54 grams, 43±0,07 grams for group B and 41±0,26 grams for group C. At the end of the experiment, almost the same growth was achieved with low fat content and more economical A feed. FCR values were found to be 1.28 for group A fish, 1.37 for group B and 1.32 for group C, respectively. There was no significant difference in the SGR ratio. VSI and HSI values were higher in B-fed fish with 15% fat content. The same growth was achieved with the less cost A feed from B group. It was obtained the less growth in C group.