감성돔 아가미에 기생하는 요각류 Alella macrotrachelus 구제를 위한 저삼투압 처리 효과

Hyposmotic Treatment for Control of the Parasitic Copepod, Alella macrotrachelus on the Gill of Cultured Black Porgy

  • Min, Byung-Hwa (Department of Aquaculture, Pukyong National University) ;
  • Jeong, Min-Hwan (Department of Aquaculture, Pukyong National University) ;
  • Noh, Gyoung-Ane (Department of Aquaculture, Pukyong National University) ;
  • Lim, Han-Kyu (Aquaculture Research Team, National Fisheries Research and Development Institute) ;
  • Choi, Cheol-Young (Division of Marine Environment & Bioscience, Korea Maritime University) ;
  • Chang, Young-Jin (Department of Aquaculture, Pukyong National University)
  • 발행 : 2006.02.25

초록

감성돔 아가미에 기생하는 Alella의 형태 및 조직학적 구조를 관찰하고, 삼투압 충격에 의한 기생충의 구제 가능성을 조사하였다. 숙주당 Alella의 기생수는 평균 5개체였으며, 모든 개체가 암컷이었다. 이들은 아가미 연골조직에 bulla를 삽입하여 몸을 고정하고 있었다. 이 기생충의 몸은 두흉부$(1825.0{\pm}495.8{\mu}m)$, 몸통$(1822.1{\pm}521.5{\mu}m)$ 부착기인 bulla $(134.2{\pm}43.1{\mu}m)$ 구성되어져 있었다. 기생충은 아가미 2차새변을 섭취하였으며, 이로 인해 감성돔은 출혈과 빈혈이 발생하였고, 숙주의 폐사는 빈혈에 의한 것으로 추정된다. 감성돔에 기생한 Alella성체는 염분농도 $0{\sim}15\%_{\circ}$에서 48시간 이내에 100% 폐사하여, 삼투압 충격에 의하여 구제할 수 있는 것으로 판단되었다.

The objective of this study was to develop an efficient control method for the Alella macrotrachelus parasitic cultured black porgy, Acanthopagrus schlegeli utilizing the superior osmoregulatory ability of the host fish. The average number of the parasites on a fish was 5 worms (all female), which were attached to the cartilage of gill filament by their bulla. Morphologically, the parasite was tripartite with each length of $1822.1{\pm}521.5{\mu}m$ for the trunk $1825.0{\pm}495.8{\mu}m$ for the cephalothorax, and $134.2{\pm}43.1$ for the bulla. In histological observations, it was found that the female parasite took gill lamellae. Damage and loss of gill lamellae by the parasite caused hemorrhage and anemia in the fish. All parasites died within 48 hours by osmotic shock of freshwater or $5{\sim}15\%_{\circ}$ seawater treatment. These results suggest that Alella macrotrachelus could be controled by hyposmotic treatment.

키워드

참고문헌

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