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3종의 연어과 어류와 수정난으로부터 분리한 물곰팡이병 원인 진균의 분류와 약물효과

Identification and chemotherapeutic effects of the fungi from three salmonid species and their eggs

김나영|정승희|박수일|이덕찬|지보영
수산생명의학회 (Aquatic Life Medical Science)|2007.08|한국어병학회지 (JOURNAL OF FISH PATHOLOGY)|제20권 제2호|pp. 147-160

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초록

2005년 11월과 12월에 걸쳐 연어 수정란 (ChS-E0511, 강원 양양), 무지개송어 수정란 (RaT-E0511, 경남 밀양), 무지개 송어 성어 (Rat-A0512, 강원 평창) 및 산천어 자어 (MaS-F0512, 강원 평창)에서 물곰팡이를 분리하였다. 분리 곰팡이의 분류 결과, 형태학적 및 유전학적 연구를 통하여 4종 모두 Saprolegnia parasitica로 확인되었으며, 연어 수정란으로부터 분리된 ChS-E0511 균주는 조란기 (oogonia)와 무성아 (gemmae)를 형성하므로 S. parasitica group 1으로 분류되었다. 분리균주인 ChS-E0511을 이용하여 다양한 약물의 성장 억제 효과를 측정한 결과, 사용금지 약물인 malchite green에 대한 약물 효과가 높게 나타났으며, 손바닥선인장 (Opuntia ficus-indica) 추출물 (MBT-01108), 2-bronopol (BNP) 및 sodium chloride 등에 대한 무지개송어 수정란의 상대발안율이 높게 나타났다. 본 연구의 결과, 국내 연어과 어류의 질병과 관련한 곰팡이는 S. parasitica로서 2가지 이상의 group으로 구분되며 다양한 약물들에 대한 평가가 지속적으로 이루어 져야 할 것으로 사료된다.

Abstract

Four strains of water mold, ChS-E0511, RaT-E0511, RaT-A0512 and MaS-F0512, were isolated from salmonid fish and/or their eggs taken from culture farms in Yangyang, Milyang and Pyeongchang, Korea in 2005. Descriptions of their morphological aspects, the results of the phylogenetic analysis conducted, and the sequence of the small sub-unit 18S rRNAs of the isolates confirmed that they all belong to the species Saprolegnia parasitica. Only one species, ChS-E0511, which was isolated from fertilized eggs of the chum salmon, was classified as part of the S. parasiticaGroup 1 according to its oogonia and gemmae production. The chemotherapeutic effects of various chemicals on the ChS-E0511 strain were assessed from the inhibitory effects of growth in GY media and the relative ratio of eyed eggs to fertilized eggs of the rainbow trout. Malchite green, a prohibited substance in food animals, was better than others, such as the Opuntia ficus-indicaextract, 2-bronopol, and sodium chloride. These results suggest that the fungi isolated from salmonids and/or their eggs identified as S. parasitica were composed of more than two groups. These isolates will be useful in an intensive evaluation of therapeutic agents.

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