淡水浴と低塩分海水浴が単生類の寄生虫マハタハダムシの駆虫と宿主キジハタの生残に及ぼす影響

抄録

We investigated the removal of the monogenean parasite Benedenia epinepheli and survival of commercially-reared host red-spotted grouper Epinephelus akaara under immersion at salinities (0-20 psu) at 28-29 ℃. Replicate samples of juvenile grouper did not die in salinities of 6 psu and above for 2 hours. All parasites were removed from fish at <10 psu. Immersion time required for the complete parasite removal in 6 and 8 psu waters was 30 and 120 minutes, respectively. Our results suggest immersion into 6 psu salinity water for 30 minutes is a practical and effective treatment to remove B. epinepheli without significant mortality.