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ISSN : 1225-3480
본 연구는 저염분 해수에 노출된 전복의 폐사 원인을 구명하고자, 수온별(15, 20 및 25℃)·염분별(30, 25, 20 및 15 psu)·노출시간별(3, 6, 12, 24 및 48 h) 북방전복, Haliotis discushannai 치패의 회복률 및 아가미의 조직학적 변화를 조사하였다. 모든 수온조건에서 20 psu 이하의 저염분 해수에 6시간이상 노출시킨 전복은 회복기간 동안 생존율이 감소하였으며,15 psu 해수에 24시간 이상 노출시킨 전복은 회복되지 못하고 전량 폐사하였다. 이를 조직학적으로 관찰한 결과, 20 psu이하의 저염분 해수에 6시간 이상 노출시킨 전복의 아가미 조직은 팽창 또는 손상되었으며, 15 psu 해수에 24시간 이상 노출시킨 전복의 아가미 조직은 대부분 파괴되었다. 이와 같은결과는 수온이 높을수록, 염분이 낮을수록, 노출시간이 길수록확연히 나타났다. 따라서 저염분 해수에 노출된 전복이 폐사하는 직접적인 원인 중의 하나는 아가미 조직의 손상으로 인한질식으로 판단된다.
This study looked into recovery rate and histological changes in the gills of juvenile abalone Haliotis discus hannai by exposure time (3, 6, 12, 24 and 48 h) of different water temperatures (15, 20 and 25℃) and salinities (30, 25, 20 and 15 psu) to understand reasons for the death of abalone exposed by low salinity water. In each water temperature, abalone spats that were exposed to low salinity water (less than 20 psu) for over 6 hours showed decrease in survival rate during recovery and those were exposed at the salinity of 15 psu for more than 24 hours all died. Histological observation showed expansion or damage of gills of the species which were exposed at less than 20 psu for over 6 hours. In case of abalones exposed at the salinity of 15 psu for over 24 hours, most gill tissues were destroyed. This result was glaringly obvious at a higher water temperature, lower salinity and longer exposure time. Accordingly, suffocation caused by damage of gills considered one of direct causes of the death.
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