Mohseni, M., Porali, H., Sajadi, M., Aghtoman, V. (2006). DETERMINATION OF THE BEST STOCKING DENSITY FOR REARING HUSO HUSO. , 15(3), 129-138. doi: 10.22092/isfj.2006.114902
M. Mohseni; H. Porali; M. Sajadi; V. Aghtoman. "DETERMINATION OF THE BEST STOCKING DENSITY FOR REARING HUSO HUSO". , 15, 3, 2006, 129-138. doi: 10.22092/isfj.2006.114902
Mohseni, M., Porali, H., Sajadi, M., Aghtoman, V. (2006). 'DETERMINATION OF THE BEST STOCKING DENSITY FOR REARING HUSO HUSO', , 15(3), pp. 129-138. doi: 10.22092/isfj.2006.114902
Mohseni, M., Porali, H., Sajadi, M., Aghtoman, V. DETERMINATION OF THE BEST STOCKING DENSITY FOR REARING HUSO HUSO. , 2006; 15(3): 129-138. doi: 10.22092/isfj.2006.114902

DETERMINATION OF THE BEST STOCKING DENSITY FOR REARING HUSO HUSO

مجله علمی شیلات ایران
Article 13, Volume 15, Issue 3, December 2007, Pages 129-138    PDF (171.64 K)
Document Type: Research Paper
DOI: 10.22092/isfj.2006.114902
Authors
M. Mohseni; H. Porali; M. Sajadi; V. Aghtoman
Abstract
Effects of stocking density on growth, food conversion ratio, specific growth rate, percentage of body weight increase in Huso huso were studied in two phases. Juveniles below one year old with an average weight of 92.09±1.72 grams and stocking densities of 1.6, 2.8 and 4 kg/m2 in 3 replicates for 100 days were reared as the phase one group. One year old Huso huso with an average weight of 918.13±21.87 grams and stocking densities of 1.5, 2.5, 3.5 and 4.5 kg/m2 reared for 120 days in 2000 liter fiberglass tanks were the second phase. Results revealed negative impact of density on growth, percentage of body weight, and specific growth rate and food conversion ratio in both phases. In the first phase, lower stocking density (1.6 kg/m2) showed significant increase in growth rate (P<0.05) as compared to 2.8 and 4 kg/m2 stocking densities resulting in 42.3% and 61 % growth rate respectively. Fish kept at 4 kg/m2 density showed malformed caudal fins and injured body due to higher tensions and contacts. In the second phase, the growth rate of fish decreased with increase in stocking density where fish with lower density (1.5 kg/m2) showed 7.2%, 15.6%, and 19.8% higher weight gain as compared to fish reared at 2.5, 3.5 and 4 kg/m2 stocking density. Analyses showed that with increase in stocking density, feeding area per fish decreases and tension between fish increases that leads to lower feeding efficiency. Based on the results, the recommended optimum stocking density for Huso huso individuals up to 90 grams is 1.5-2 kg/m2and for fish individuals over 900 grams each the density should be kept at 2.5-3 kg/m2.
Keywords
HUSU HUSO; Stocking density; Food conversion ratio; Growth
References
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