Cite this paper:
WANG Yanfeng, CHI Liang, LIU Qinghua, XIAO Yongshuang, MA Daoyuan, XIAO Zhizhong, XU Shihong, LI Jun. Effects of stocking density on the growth and immunity of Atlantic salmon salmo salar reared in recirculating aquaculture system (RAS)[J]. HaiyangYuHuZhao, 2019, 37(1): 350-360

Effects of stocking density on the growth and immunity of Atlantic salmon salmo salar reared in recirculating aquaculture system (RAS)

WANG Yanfeng1,2,3, CHI Liang4, LIU Qinghua1,2,3, XIAO Yongshuang1,2,3, MA Daoyuan1,2,3, XIAO Zhizhong1,2,3, XU Shihong1,2,3, LI Jun1,2,3
1 CAS Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2 Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266000, China;
3 Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China;
4 College of Veterinary Medicine, Qingdao Agricultural University, Qingdao 266109, China
Abstract:
Atlantic salmon reared in recirculating aquaculture system (RAS) may lead to inappropriately high stocking density, because fish live in a limited space. Finding the suitable stocking density of Atlantic salmon reared in RAS is very important for RAS industry. In this paper, the influence of stocking density on growth and some stress related physiological factors were investigated to evaluate the effects of stocking density. The fish were reared for 220 days at five densities (A:24 kg/m3; B:21 kg/m3; C:15 kg/m3; D:9 kg/m3 and E:6 kg/m3). The results show that 30 kg/m3 might be the maximum density which RAS can afford in China. The stocking densities under 30 kg/m3 have no effect on mortality of Atlantic salmon reared in RAS. However, the specific growth rate (SGR), final weight and weight gain in the high density group were significantly lower than the lower density groups and middle density groups. Moreover, feed conversion rate (FCR) had a negative correlation with density. Plasma hormone T3 and GH showed significant decrease with the increase of the stocking density of the experiment. Furthermore, thyroid hormone (T3), GH (growth hormone) activities were decreased with stocking density increase. However, plasma cortisol, GOT (glutamic oxalacetic transaminase) and GPT (glutamic pyruvic transaminase) activities were increase with stocking density increase. And the stocking density has no effects on plasma lysozyme of Atlantic salmon reared in RAS. These investigations would also help devise efficient ways to rear adult Atlantic salmon in China and may, in a way, help spread salmon mariculture in China.
Key words:    stocking density|growth|physiological parameters|Atlantic salmon|RAS   
Received: 2017-11-24   Revised: 2018-02-01
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Articles by WANG Yanfeng
Articles by CHI Liang
Articles by LIU Qinghua
Articles by XIAO Yongshuang
Articles by MA Daoyuan
Articles by XIAO Zhizhong
Articles by XU Shihong
Articles by LI Jun
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