The effect of extension of the day light on the growth parameters of common carp (Cyprinus carpio, Linnaeus 1758) farming

In this study, the effects of different photoperiod regimens on the growth parameters of the mirror carp (Cyprinus carpio) growth in cages were investigated. Large fish groups with a mean live weight of 73.53 ± 25.50 g and small fish groups with a mean an average live weight of 24.46 ± 8.20 g were used in the study. Natural lighting (A) for each group of fish; 18A: 6K (18 hours illumination, B) and continuous illumination (C) 3 different photoperiod regime was applied. Big fish group is named as 1, small fish group 2. A total of 27.411 juvenile mirror carp were used in the experiment. In the study, the fish in the experimental groups were fed daily for 196 days, respectively 3, 4, 5 times a day. At the end of trial, the big fish were A1; B1; C1; While 2462.35±9.4 g, 2686.88±37.01g, and 2955.11±37.93 g respectively, general FCR 1.52; 1.86; 2.01 g, general SGR was found to be 1.86±0.05, 1.89±0.04, 1.94±0.03. At the end of 196 days, small fishes were determined as A2; B2; C2; 1234.79±82.33g, 1748.84±22.02 g, 1905.71±43.92 g respectively, while the general FCR was 1.33; 1.44; 1.61, general SGR 2.14±0.02; 2.31±0.02, 2.36±0.02. At the end of the experiment, it was determined that 18L:6D lighting regime had a positive effect on the growth and development performance of mirror carp fish. Keywords: Mirror carp, Cyprinus carpio, photoperiod