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가막만 양식굴의 대량폐사에 관한 연구 Ⅱ. 부착생물 및 납작벌레

Mass mortality of oyster, Crassostrea gigas in Kamark bay Ⅱ. Fouling organisms and flatworms

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Fouling organisms and flatworms have been investigated at mass mortality of oyster, Crassostrea gigas in Kamark Bay. Mean mortality of oyster were 76.85% (75.4~78.4%) in inner (st. 10, 11) of Kamark Bay, 23.61% (9.6~43.6%) outer (st. 1~4, 7~9) of Kamark Bay, and 54.7% (49.0~60.4%) in Baekdo (st. 5, 6), respectively. At surrounded oyster farm area, temperature and salinity were 1.5℃ and 0.0003 higher from August to september in 1996 than ordinary year (1990~1995). fouling organisms of oyster culturing beds such as Mytilus edulis, Balanus sp., Styela sp., Caprella kroeyeri, Tropiometra afra macrodiscus and Actiniidae were much in quantity(1~5 individuals per collector). And more organism malignant to oyster culture such as Stylochus sp. were found especially in all stations(3~43 individuals per hanging rope). Number of Stylochus sp. in Baekdo (st. 5, 6) and inner Kamark Bay(st. 10, 11) ranged 21~43 individuals per hanging rope. This suggests that the mass mortality of cultivated oyster is caused by aqua-farm environment and flatworms.

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