Effects of stress induced by changes of water temperature on the non-specific defense mechanism in cultured olive flounder, Paralichthys olivaceus

수온 변동 자극이 양식 넙치, Paralichthys olivaceus의 비특이적 생체 방어에 미치는 영향

  • 이덕찬 (부경대학교 수산과학연구소) ;
  • 김도형 (부경대학교 대학원 해양산업공학과) ;
  • 김수미 (부경대학교 수산과학연구소) ;
  • 강명석 (부경대학교 산업대학원 수산양식학과) ;
  • 홍미주 (부경대학교 수산생명의학과) ;
  • 김현정 (부경대학교 수산생명의학과) ;
  • 박수일 (부경대학교 수산과학연구소)
  • Published : 2002.08.01

Abstract

This study was performed to know the effects of stress induced by the daily fluctuation of water temperture from 18$^{\circ}C$ to 25$^{\circ}C$ up and down for 30 days on the defence mechanism of olive flounder. Puralichthys olivaceus. To make clear the temperature stress on the defense mechanism of the tested fish. several factors of immune response such as counting of leucocyte appearance in peripheral blood, phagocytic activity in whole blood cells, nitroblue tetrazolium(NBT) reduction, chemiluminescence(CL) response, and lysozyme activity were investigated at 28 days after giving the change of water temperature. The fish was controlled under the none feeding condition during experimental period. Mortality of the tested fish was rapidly increased up to 22% within the first one week of the experimental period without any additional stress factors. The number of neutrophil of peripheral blood in the tested group was significantly higher than the control group at the 2nd week. but the number of lymphocyte was significantly lower than the control group at the 1st and 3rd day of the experimental period. respectively. In the NBT reduction test, the activity of macrophage in the control group fish was the highest on the 7th day while that in the tested group was on the 3rd day. Also. the phagocytosis of tested group against formalin killed cells was retarded compared with the control. CL response of the tested group was significantly lower from 2nd to 5lh day of the experimental period than the control. 'The lysozyme activity of tested group was remained higher during the experimental period than the control. Even though the tested fish showed different results in some non-specific factors of immune respceses between tested and control group fish, olive flounder seems highly adaptable in repealed water temperature change in condition after one week under the given temperature fluctuation range.

Keywords

References

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