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KMID : 0380420010250030141
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Journal of Prventive Veterinary Medicine
2001 Volume.25 No. 3 p.141 ~ p.149
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Effects of FST-Chitosan Mixture on Cultured Rockfish (Sebastes schlegeli) and Olive Flounder (Paralichthys olivaceus)
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Jeon Byeong-Gu
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Abstract
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Various immunostimulants have been used in aquaculture industry for increasing resistance to infectious diseases. These immunostimulants also have additional effects, such as growth enhancement, on fish. Here we investigated the effects of fish somatotrophin-chitosan mixture (FST-chitosan) on cultured rockfish ( Sebastes schlegeli) and olive flounder ( Paralichthys olivaceus).
When the experimental group was treated with FST-chitosan (30mg/kg body weight) perorally for 2 months, the average body weight and average body length of fish in the experimental group were higher than those of fish in the control group. In an artificial infection experiment, experimental group was treated with FST-chitosan (30mg/kg body weight) perorally for 10 days, and challenged with Edwardsiella tarda and Streptococcus sp. Cumulative mortalities against E. tarda and Streptococcus sp. in FST-chitosan treated group were lower than those in non-treated group. In field trials, although FST-chitosan did not give 100% protection, cumulative mortalities were reduced by the treatment. These results suggest that FST-chitosan can be used as a useful immunostimulant in rockfish and flounder cultures.
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