Journal of Aquaculture (한국양식학회지)

The Korean Society of Fisheries and Aquatic Science (한국양식학회)
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Improvement of Growth and Survival Rate in Larval and Juvenile Rockfish (Sebastes schlogeli) from Mother Fish in Vitellogenesis Injected with 3,5,35-triiodo-L-thyronine($T_3$)

난황형성기 모체내 3,5,35-triiodo-L-thyronine ($T_3$) 주사에 의한 조피볼락 자치어의 성장과 생존율 향상

  • 강덕영 (부경대학교 수산과학대학 양식학과) ;
  • 장영진 (부경대학교 수산과학대학 양식학과)
  • Published : 1998.08.01
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Abstract

The growth and survival rate of larvae and juveniles from female rockfish (Sebastes schlegeli) broodstock in vitellogenesis by injection of 3,5,3'-triiodo-L-thyronine $T_3$ with a dose of 20 mg/kg fish wt. were examined for 30 days and compared with sham-control fish injected dime-thyl sulfoxide and control fish. Larvae were fed with rotifers for first 5 days after parturition, rotifers and Artemia nauplii for next 10 days. And then, they were fed with Artemia nauplii and commercial diet. Growth of larvae and juveniles from maternal $T_3$injection was significantly faster than that of two controls, nevertheless, the condition factor was lower than that of controls. The whole body proximate analyses indicated that there were significant effects of $T_3$ injection on protein and lipid, but no significant on moisture and ash contents. Survival rate of the fish from maternal $T_3$injection was significantly higher than that of fish from the two controls. These results indicate that thyroid hormone supplements appear to confer a distinct advantage to larval and juvenile rockfish in early, fragile development stage.

난황형성 단계에 있는 암컷 어미에게 갑상선 호르몬인 3,5,3'-triiodo-L-thyronine ($T_3$)를 20 mg $T_3$/kg 체중으로 주사하여 출산된 조피볼락 자어를 대조구인 sham구 및 control구 자어와 함께 30일간 사육하면서 성장과 생존율을 비교하였다. 자어에게는 출산후 5일째까지 rotifer를 공급하였고, 6~15일까지 rotifer와 Artemia nauplii를, 이후 30일까지 Artemia nauplii와 넙치용 배합사료를 혼합공급하였다. 출산후 자어의 성장은 대조구들에 비해 $T_3$구에서 유의하게 빨랐으며, 생존율 역시 T하(3)구가 대조구들 보다 유의하게 높았다. 실험종료시 치어의 비만도는 $T_3$구가 control구에 비해 다소 낮았고, sham구에 비해서는 유의하게 낮았다. 이상의 결과, 조피볼락에 대한 $T_3$의 모체주사는 모체에서 유래된 외인성$T_3$가 초기 출산자어의 생리활성을 증진시켜, 자치어의 성장과 생존율 향상에 도움을 줄 수 있는 것으로 평가되었다.

Keywords

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