2015, Volume 17, Issue 1
Strategic Study of CAE >> 2015, Volume 17, Issue 1
Effect of stocking density on growth and quality in muscles of Cynoglossus semilaevis Günther adult fish in industrial recirculating aquaculture
1. Fisheries Aquaculture Engineering Laboratory, Marine Science and Engineering College, Qingdao Agricultural University, Qingdao, Shandong 266109, China;
2. Qingdao Key Laboratory for Marine Fish Breeding and Biotechnology, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Science, Qingdao, Shandong 266071, China
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Abstract
In order to collect more basic data of intensive aquaculture of Cynoglossus semilaevis Günther， 4 groups of different stocking densities were set up in industrial recirculating aquaculture system， the adult fish in rapid growth period (0.64±0.063) kg were observed， the parameters of growth and quality in muscles were detected. The results were shown as follows. a. The experiment continued for 7 months， the survival rate of Cynoglossus semilaevis Günther in recirculating aquaculture mode was in 88.01 %～93.34 %， weight gain rate was 139.69 %～191.09 %. With the decrease of stocking density， survival rate was on a declining curve， while growth rate and fatness were on a rising trend. The concentration of growth hormone was 2.522～2.862 4 μg/L， which was on a rising trend in earlier stage and then on a declining curve in later stage with the decrease of stocking density. b. There is no regular change of moisture， ash content， crude protein， crude fat， amino acid and fatty acid with the change of stocking density. c. In this experimental condition， the group whose intial stocking density is 210 got the best culture effect； the average survival rate per month was 98.72 %； the average gaining in weight per month was 0.152 6 kg/pcs； after 7 months breeding， the specific yield reached 23.03 kg/m3. This study showed that Cynoglossus semilaevis Günther has a good adaptability in industrial recirculating aquaculture， and the growth and quality in muscles were all in a better condition. It also showed that industrial recirculating aquaculture can greatly develop the culture potential of Cynoglossus semilaevis Günther， which was a preponderant culture mode for intensive aquaculture of Cynoglossus semilaevis Günther.
Keywords
Cynoglossus semilaevis Günther ; recirculating aquaculture ; stocking density ; growth ; nutrient composition
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