Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Survival, Hematologic and Histological Changes of File Fish Thamnaconus modestus Adult Exposed to Different Lower Temperature

저수온에 노출된 말쥐치 Thamnaconus modestus의 생존율, 혈액학적 및 조직학적 반응

  • Kim, Hae Jin (South East Sea Fisheries Research Institute, NIFS) ;
  • Lee, Hee-Jung (South East Sea Fisheries Research Institute, NIFS) ;
  • Kim, Won Jin (South East Sea Fisheries Research Institute, NIFS) ;
  • Shin, Yun Kyung (South East Sea Fisheries Research Institute, NIFS)
  • 김혜진 (국립수산과학원 남동해수산연구소) ;
  • 이희중 (국립수산과학원 남동해수산연구소) ;
  • 김원진 (국립수산과학원 남동해수산연구소) ;
  • 신윤경 (국립수산과학원 남동해수산연구소)
  • Received : 2019.10.14
  • Accepted : 2019.12.03
  • Published : 2019.12.31
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Abstract

Temperature is one of the most important criteria considered in species preference for aquaculture. Acute drop in temperature during winter is a cause of disease and mass mortality in farmed fish. This study was carried out the low water temperature tolerance, oxygen consumption, hematologic and histological responses to use as basic data for the management of fish farming which frequently cause death due to winter water temperature drop. Low-lethal water temperature for 4 days of file fish Thamnaconus modestus (4day-LT50) was 6.97℃ (6.69~7.27℃). Oxygen consumption rate decreased with decreasing water temperature, showing a significant difference between water temperatures. SOD activity increased significantly at 6℃ experimental group than control group (10℃) (p<0.05), but CAT did not show any significant difference between experimental temperatures (p>0.05). Cortisol increased with decreasing experimental water temperature compared to control group. Histological changes in the liver include decreased blood vessels in the blood vessels, proliferation of acid cells, condensation of the nucleus, atrophy of pancreatic exocrine gland cells, and enzyme source granules.

수온은 양식어류의 생존에 영향을 미치는 가장 주요한 환경 요인이며, 겨울철 급작스런 수온 하강은 양식어류의 질병과 집단폐사 발생의 요인이 되기도 한다. 본 연구는 겨울철 수온 하강으로 인해 빈번하게 폐사가 발생하고 있는 말쥐치의 양식관리를 위한 기초자료로 활용하기 위해 말쥐치의 하한수온내 성범위, 산소소비율, 혈액학적 및 조직학적 반응을 조사하였다. 수온 5℃에서 노출 3일째, 수온 6℃에서는 노출 4일째 모두 폐사하여 말쥐치의 저수온에 대한 반수치사 하한수온은(LT50) 6.97℃ (6.69~7.27℃)였다. 산소소비율은 수온 하강에 따라 감소하여 수온 간 유의한 차이(p<0.05)를 나타내었다. 혈액내 활성산소 소거효소인 SOD활성도는 대조구 10℃에 비해 수온 6℃에서 유의하게 상승하였다(p<0.05). 반면 CAT는 실험수온 간에 유의한 변화를 나타내지 않았다(p>0.05), 삼투질농도는 대조구와 실험수온 간 유의한 차이는 나타나지 않았다(p>0.05). 코티졸은 대조구에 비해 수온 하강에 따라 증가하였으며 수온 간 유의한 차이를 나타내었다(p<0.05). 간의 조직학적 변화는 혈관내 혈구의 감소, 간세포의 공포화와 간세포 핵의 응축, 췌장 외분비 선세포의 위축 및 효소원과립들이 감소하였다.

Keywords

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