Effects of Goldfish (Carassius auratus) and Roach (Rutilus rutilus) extracts on the growth indexes and survival rate of Beluga (Huso huso Linnaeus 1758) fingerlings

In order to investigate the effect of extracts of Goldfish and Roach extracts on the food acceptability of giant sturgeon fingerlings (Huso huso), an experiment for about a month was carried out in the Aquaculture Research Center of the School of Fisheries at the University of Agricultural Sciences and Natural Resources of Gorgan. To do this research, Goldfish and Roach extracts mixed together with three concentrations (diluted, medium and concentrated) and three replicates of each were added to the diet of fingerling giant sturgeon. Experiment was conducted within 250 liter polyethylene tanks which were half filled. 20 specimens of fingerling Beluga with an average weight of (5 ±0.2 g) were placed into storage tanks and were fed four times daily as much as full satiety. At the end of the cultivation period Growth Factors and survival were analyzed. Results showed that adding extracts of Goldfish and Roach in the diet of fingerling Beluga the growth parameters such as: Weight Gain (WG), percentage of Weight Gain (PWG), Specific Growth Rate (SGR), Condition Factor (CF), Daily Growth Rate, Daily Growth Index (GI) and Food Conversion Ratio (FCR) has been improved. Although, all treatments compared with control were significantly different, but the best indicators of growth at least in the treatment of Roach was observed. Also a significant difference in Survival Rates between treatments were observed (P < 0.05). The highest Survival Rate in treated extracts of Goldfish was observed in average concentration and minimum was observed in control treatment (P < 0.05).