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IJFS 2017, 16 Back to browse issues page
Responses of growth rates and growth hormone levels of African catfish (Clarias gariepinus) to stocking density
X.M. Wang *, J.W. Gao, M. Xu, B.L. Mo, W. Dai, CH.X. Chen
, xiaomeiwem@yahoo.com
Abstract:   (2092 Views)

In order to estimate responses of growth rate and growth hormone of Clarias gariepinus to stocking density, fish (initial weight 30.71 ± 0.89 g) were stocked in 120-L tanks at densities of 35, 65, 95, and 125 kg/m3 for 60 days. On day 30 and 60, the fish growth rates were measured, pituitary growth hormone (GH) mRNA levels and serum GH concentrations were examined by real-time qPCR and ELISA technique, respectively. From day 0 to day 30, there were significant decreases in specific growth rates and relative weight gains at higher densities (95 and 125 kg/m3) compared to that at lower densities (35 and 65 kg/m3), whereas no significant effects of stocking density on the two indexes during the day 30−60 were detected. On day 30, GH mRNA levels were unaffected by stocking density, while on day 60, GH mRNA levels were significantly lower at the density of 125 kg/m3 than in the two lower densities. Serum GH concentration increased with decreasing stocking densities but only significantly between 35 kg/m3 and the other treatments on day 30. However, there were no significant differences between two lower densities as well as between 65 kg/m3 and 95 kg/m3 treatments on day 60. These results implied that effect of stocking density on SGR and RWG of C. gariepinus weren’t uniform in different growth periods and a weak positive correlation was observed between growth rate and GH in C. gariepinus in the present study.

Keywords: Clarias gariepinus, Stocking density, Specific growth rate, Relative weight gain, Growth hormone, Real-time qPCR, ELISA
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Received: 2017/05/14 | Accepted: 2017/05/14 | Published: 2017/05/14
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Wang X, Gao J, Xu M, Mo B, Dai W, Chen C. Responses of growth rates and growth hormone levels of African catfish (Clarias gariepinus) to stocking density. IJFS. 2017; 16 (2) :698-710
URL: http://jifro.ir/article-1-2728-en.html

Volume 16, Issue 2 (2017) Back to browse issues page
مجله علوم شیلاتی ایران Iranian Journal of Fisheries Sciences
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