사료 내 면실박 및 대두박 첨가가 넙치의 번식 조직학에 미치는 영향

Effects of Dietary Supplementation of Cottonseed and Soybean meal on Reproductive Histology of Olive Flounder, Paralichthys olivaceus

  • Lim Se-Jin (Faculty of Applied Marine Science, Cheju National University) ;
  • Lee Kyeong-Jun (Faculty of Applied Marine Science, Cheju National University) ;
  • Lee Young-Don (Marine and Environmental Research Institute, Cheju National University) ;
  • Song Young-Bo (Faculty of Applied Marine Science, Cheju National University)
  • 발행 : 2006.05.01

초록

The gossypol existed in cottonseed meal is a well known antispermatogenic agent which can impair reproductive performances of male fish as well as mammals. Two feeding experiments were conducted to examine a toxic effect of dietary supplementation of cottonseed meal on reproduction in juvenile olive flounder (the first experiment) for 19 weeks and growing olive flounder (the second experiment) for 26 weeks. After each feeding study, females and males were sampled for histological examination in gonads and liver to verify any negative effects by the dietary supplementation of cottonseed and soybean meal on reproduction. After two feeding trial, the gonad somatic index (GSI) of male and female (from the first feeding trial) were not significantly different among all the dietary treatments. The GSI values of female (from the second feeding trial) were not significantly different among all the dietary treatments. However, males fed cottonseed and soybean meal containing diets exhibited significantly lower GSI than that fed the control diet after the second feeding trial. Histological examination of gonads and liver of fish fed cottonseed and soybean meal did not show any negative effects compared to those of fish ffd the control diet. Hepatosomatic index of fish in the first and second feeding trials were not significantly different among all the dietary treatments. The findings in this study suggest that dietary supplementation of cottonseed and soybean meal up to 40% fish meal replacement might not deteriorate the gametogenesis of juvenile and growing olive flounder. However, the supplementation in diets over 30% fish meal replacement might reduce GSI of male in growing olive flounder.

키워드

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