The optimized age and weight for release of juvenile stellate sturgeon (Acipenser stellatus) fer stocking

Document Type : Tarvij

Authors

1 International Sturgeon Research Institute

2 Iranian Fisheries Research Institute

Abstract

Nowadays, the artificial reproduction of sturgeon fish is the only method to restore the stocks of these valuable species. In this research, fingerlings provided from the reproduction and restocking center of Shahid Beheshti Complex and stocked in 12 tanks 2-ton with sea water, hole water and their mixture along with aeration with appropriate density. A number of 1200 stellate fingerlings at different ages of 55, 69, 77 and 85 days after hatching were stored at a density of 100 per square meter. Habituation of A. stellatus fingerlings in four rearing treatments including 55 days (0.5-1 g) treatment A, 69 days (1-3 g) treatment B, 77 days (3-5 g) treatment C and 85 days (5-10 g) treatment D was carried out in water and 4 tests in different salinities (0.5, 0.5-4, 4-9 and 9-13 g/thousand) and each test was done in 4 treatments. Each treatment was designed with 3 repetitions. Each experiment was carried out in a period of approximately one month along with feeding with live food, preferably gamarus, nereis worm, shironomide at the saturation level of 6 meals a day, and siphoning and changing water continuously. Biometry was done every 10 days. According to the study, A. stellatus fish fingerlings reached a growth of about 1 gram after 15 days of rearing in the 55-day rearing period (0.5-1 g). In the breeding period of 69 days (1-3 grams), after 24 days of rearing, the fingerlings reached an average weight of 5 grams

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