• Food Science and Biotechnology
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• 제15권1호
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• pp.28-32
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• 2006

Protease inhibitor of 72.6 kDa was successively purified from chum salmon (Oncorhynchus keta) eggs by ion exchange, gel permeation, and affinity chromatographies. Protease inhibitor was purified with yield and purification fold of 1.50% and 58.11, respectively. SDS-PAGE results showed purified protease inhibitor consisted of two protein subunits of 54.0 and 18.6 kDa. Chum salmon inhibitor exhibited stability between 20 and $40^{\circ}C$ in weak acid environment (PH 6), and inhibited papain and cathepsin, members of cysteine protease, but not chymotrypsin. The protein inhibited cathepsin more effectively than did egg white protease inhibitor, whereas the reverse was true for papain. These results indicate chum salmon egg inhibitor is heterodimer, thus the inhibitor was classified as cysteine protease inhibitor.

• 한국어류학회지
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• 제5권1호
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• pp.53-67
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• 1993

1989년, 1990년 12월 강원도 양양군 남대천에서 채포한 연어로부터 수정난을 받아 양양내수면연구소와 한국해양연구소, 부화, 사육실에서 난 발생 과정 및 자치어의 형태를 관찰하였다. 수정난은 평균 난경이 7.2mm이며 주황색, 적색을 띤 분리 침성난이다. 부화까지의 적산 온도는$480{\sim}531^{\circ}C$였다. 부화직후의 자어는 전장이 1.80~2.56cm범위이며 커다란 난황을 갖고 바닥에 누워 있었다. 부화후 35일이 지난 평균 전장 3.56cm인 자어는 난황을 완전히 흡수하고 체측에 7~11개의 parr무늬가 나타나 치어(fry)기에 이른다. 부화후 3개월이 지나면 평균 전장이 $5.67{\pm}0.53cm$로 자라고 몸은 은색 광택을 띠면서 스몰트(smolt)가 된다. 연어의 초기 발육과정은 성장 체형의 변화로 미루어 1) 부상전의 자어기, 2) 부상기, 3) 스몰트기의 3단계로 나눌 수 있었다. 부상기에는 전장에 대한 주둥이, 몸통 길이, 체고의 비성장 속도가 빨랐다.

• 한국수산과학회지
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• 제42권1호
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• pp.34-40
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• 2009

In fresh water fish hatcheries and farms, Saprolegniales often cause serious mortality to the fish and their eggs. Malachite green is an effective antifungal agent, but is carcinogenic to fish and humans. Alternative antifungal agents are needed. Presently, we tested various concentrations of MBT-01108 (Opuntia ficus-indica extracts) alone and in combination with bronopol, formalin and sodium chloride (MBT-01108 mixture) on in vitro mycelial growth and in vivo remediation of adult eel, Anguilla japonica, infected with Saprolegnia sp. and fertilized eggs of chum salmon, Oncorhynchus keta, to evaluate the compounds' antifungal efficacy on eyed-egg and hatching rates. MBT-Oll08 mixtures incorporating bronopol and formalin at respective concentrations of 50 and 30 parts per million (ppm), and 100 and 20 ppm were most effective in controlling Saprolegnia in vitro and in vivo (P<0.05). Repeated daily exposures to 50 ppm and 100 ppm MBT-01108 were more effective than exposure every 2-3 days post-fertilization for the inhibition of Saprolegnia infection of rainbow trout, Oncorhynchus mykiss eggs as compared with control (0 ppm).