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Fish Farm Performance of Copper-alloy Net Cage: Biological Safety of Red Sea Bream Pagrus major Rearing the Copper-alloy Net Cage  

Shin, Yun Kyung (South East Sea Fisheries Research Institute, NFIS)
Kim, Won-Jin (South East Sea Fisheries Research Institute, NFIS)
Jun, Je-Cheon (Aquaculture Management Division, Aquaculture Research Institute, NIFS)
Cha, Bong-Jin (Fisheries Engineering Research Division, NIFS)
Kim, Myoung-Sug (Pathology Division, NIFS)
Park, Jung Jun (South Sea Fisheries Research Institute, NIFS)
Publication Information
Korean Journal of Ichthyology / v.29, no.1, 2017 , pp. 41-51 More about this Journal
Abstract
To understand the application in farm for the fish aquaculture, we investigated biological and pathological traits on red sea bream Pagrus major which were reared in each copper-alloy net cage and the synthetic fiber net cage for 9 months. Two groups of cage were made and set in Yokji-eup, Tongyoung, Gyeongsangnam-do in size of 25 m in diameter and 10 m of depth. Survival rate of the red sea bream in the rearing copper-alloy net cage and synthetic fiber cage showed 99.75% and 99.70% respectively, there was no significant difference. Daily weight growth rate in each net was shown to 2.13 g/day and 1.65 g/day. Health analysis by blood composition analysis showed a favorable result in the copper-alloy net cage rather than in the synthetic fiber net. Bioaccumulation of heavy metal such as Cu and Zn especially in gonad was higher than other organ. Bioaccumulation of Cu and Zn in the muscle was lower compared to the permitted standard for food safety. Pathogenic infection test discovered Microcotyle tai for parasite, V. alginolyticus and other five species for bacteria. But there was a little bit difference of bacteria infection in copper-alloy net cage and copper-alloy net cage is expected to be has antibacterial effect. Thus, copper-alloy net cage can be applied to farm considering its system stability, recycling, antibiosis and food safety.
Keywords
Pagrus major; copper-alloy net cage; health analysis; pathogenic infection;
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