• 한국양식학회:학술대회논문집
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• 한국양식학회 2002년도 춘계 한국양식학회 학술대회 발표요지
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• pp.240.2-241
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• 2002

• 한국동물학회:학술대회논문집
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• 한국동물학회 2001년도 공동 춘계학술대회
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• pp.83-83
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• 2001

No Abstract, See Full Text

• 한국양식학회:학술대회논문집
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• 한국양식학회 2003년도 추계학술발표대회 논문요약집
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• pp.145-145
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• 2003

To evaluate the effect of PAHs on fertilization and larval development of the Pacific oyster, Crassostrea gigas via in vivo exposure for 30 days. Conditioned C. gigas adult brood stock was taken from oyster farm in May 2003 and raised in flow through tank at 20-22$^{\circ}C$ with feeding equivalently mixed marine microalgae: Chaetoceros simplex, C. gracilis, Isochrysis galbana and Tetrasemis tetrathele. The oysters were exposed to PAHs cocktail at 200ppb (10 species) until they are fully riped with an untreated group. Motility of sperm, Fertilization and The percent of D-shaped larvae was measured under microscope (Olympus BX-50). Fertilization capability using dry sperm and eggs from both non- and PAHs treated brood stocks was significantly reduced at the treated group (P<0.01). In addition to the origin effect, it was obvious that fertilization of eggs from both group were adversely suppressed in consistent with PAHs level (P<0.01). The percent of D-shaped larvae in treated group was significantly reduced comparing to non-treated. The percent was adversely correlated with PAHs level, which was more significantly reduced in treated group. Therefore, it was obvious that PAHs exposure on the Pacific oyster has adverse affects on the sperm as well as larvae in both maternal and acute source.

• Fisheries and Aquatic Sciences
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• 제18권3호
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• pp.235-240
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• 2015

Seasonal variation in the prevalence of norovirus in oysters Crassostrea gigas was investigated and compared to levels of Escherichia coli, a fecal indicator in oysters. Oysters were collected from Iwon-myeon, Taean-gun, Korea, a primary production area for European Union export of oysters between 2013 and 2014. We observed seasonality in the prevalence of norovirus in oysters, with a higher prevalence and viral load detected during winter months. Oysters taken from production areas that complied with the European Union standard for raw consumption (< 230 MPN/100 g of E. coli) had 22.1% of the samples test positive for norovirus (15/68 samples). However, norovirus was not detected in any of the samples (0%, 0/4 samples) that were collected from production sites that exceeded the standard fecal contamination level for raw consumption (> 230 MPN/100 g of E. coli). These results indicated that there is a negative correlation between the prevalence of norovirus and high levels of E. coli in oysters. Therefore, our results suggest that current food safety guidelines using only a bacterial fecal contamination indicator, E. coli, may not adequately assess shellfish production areas for viral and bacterial contamination.

• 한국수산과학회지
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• 제15권1호
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• pp.42-46
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• 1982

한국산 참굴종패를 1981년 2월에 열대수역인 Malaysia국의 Ambong만에 이식하여 1981년 7월까지 양성하였다. 패각의 성장은 온대 수역에 비하여 훨씬 빠른 편이며 7월에 각고가 약 38.9lmm로 성장하였다. 육중은 이식 후 증가하기 시작하여 5월에 약 1.66g으로 최고의 값을 보인 후 6월 및 7월에는 각각 1.20g및 0.74g으로 현저히 감소하였다. 비만도의 경우도 5월 이후 현저히 감소하여 7월에 $11\%$로 가장 낮은 값을 보였다. 7월까지의 생존율은 약 $38\%$로 다른 열대수역에 이식한 것 보다 높은 편이었다.

• 한국수산과학회지
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• 제46권6호
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• pp.813-818
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• 2013

In order to understand the co-culture impact of the sea squirt Halocynthia roretzi on the Pacific oyster Crassostrea gigas, we examined the filtration rate of the sea squirt in relation of water temperature ($5-25^{\circ}C$) and body weight. The filtration rate increased in relation to body weight and water temperature, indicating a clear positive correlation with the two variables. Due to the clear positive correlation between filtration rates at each temperature groups for acceptable collinearity, each constants at regression equation was further analyzed for a unified model of filtration rate. Therefore the filtration rate of H. roretzi was estimated as: Fr (L/h/animal)=$(0.1956+0.0182T){\times}DW^{0.7978EXP(-0.0273T)}$ for water temperature in the range of $5-25^{\circ}C$. The estimated filtration rates of H. roretzi were higher than those of C. gigas in the winter season (water temperatures below $16^{\circ}C$) in condition of equal body weight. Our results indicate that H. roretzi may have an advantage over C. gigas in food competition during the winter season when the two species are co-cultured.

• 한국환경과학회지
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• 제5권5호
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• pp.605-610
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• 1996

시판중인 생굴을 대상으로 Vibrio 속을 숙주로 하는 bacteriophage의 분리를 시도하였다. 4 종의 Vibrio 속과 5 혈청형의 Vibrio parahaemolytius를 실험대상으로 한 결과 배brio parahaemolyticus 2 혈청형에서만 bacteriophage가 분리되었다. 분리된 phage의 plaque 크기는 0.4mm였으며 전자현미경적 형태는 미부가 뚜렷하지 않은 육각형의 두부가 관찰되었고 크기는 67nm$\times$83nm 였으며, PFV/ml은 1.25$\times$$10^{11}$이었다. 분리된 phage는 chloro-form에 감수성을 나타내었다. 분리된 phage의 genomic 특성을 규명하기 위하여 핵산을 분리한 결과 DNA로 판명되어졌으며 두 혈청형 모두 제한효소 처리한 결과 Eco R I으로 4부위의 절단양상과 Hind III로부터 14부위 절단양상이 관찰되었다.

• 한국패류학회지
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• 제15권2호
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• pp.121-125
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• 1999

The present study aimed to elucidate whether and intestinal fluke, Gymnophalloides sp. exist in Gogunsan-gundo located at western part of Korean Peninsula; about 100 km apart from Gunsan city, Jeollabuk-do, Korea. The survey was carried out Two times each in 1997 and 1998, examining stool samples by means of formalin-ether concentration method. Results are summarized as follows : of 411 fecal samples examined, Gymnophalloides sp. positives were 19 (8.9%); 9.5% inMunyeodo, 1% in Seonyudo, but none in Jangjado. The positive cases did not show any specific clinical complaints. Prevalence rate of Gymnophalloides seoi metacercariae from oysters, Crassostrea gigas were 80.8%

• 한국수산과학회지
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• 제9권4호
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• pp.281-285
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• 1976

1976년 2월부터 5월까지 사이에 Venezuela국 서북부에 있는 Cocineta호산 굴의 채묘시간에 대하여 조사했다. 수분 함량 중 개체간의 수분 함량 범위는 2월에서 부터 5월로 되면서 차차 넓어졌고, 월별 수분 함량의 평균 값은 그 범위가 $80.67\~82.25\%$로서 큰 차가 없었다. 성숙 부유 유생 및 출현수로부터 채묘 시기로서 가장 좋다고 생각되는 시기는 4월 하순에서 5월 상순 사이이고 채묘 장소로서 가장 좋다고 생각되는 곳은 station 3이었으며 그 다음이 station 4였다.

• 한국수산과학회지
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• 제25권6호
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• pp.485-494
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• 1992

1985-1989년간 한국연안의 서로 다른 서식지로부터 채집된 진주담치 Mytilus edulis와 굴 Crassostrea gigas중의 중금속 농도를 알아보았다. 두이매패류에서 가장 높은 중금속농도는 조사점 1, 2, 5, 23 그리고 25에서 발견되었던 반면 가장 낮은 중금속농도는 진해만 주위의 조사점에서 발견되었다. 5개년간 굴과 진주담치의 평균중금속농도비는 Cu 16:1, Cd 1.63:1, Pb 1.36:1, Zn 7.61:1 그리고 Hg 2.08:1로서 굴이 진주담치보다 Cu, Zn, Hg에서 보다 효과적인 생물농축자로 나타났다. 진주담치의 크기별 분포는 크기가 클수록 중금속농도도 증가하였다.