Ichthyotoxicity of Paralytic Shellfish Poison
نویسندگان
چکیده
Attempts were made to examine the ichthyotoxicity of paralytic shellfish poison (PSP) in sixteen species of marine and freshwater fishes. Most of them showed minimum lethal doses (LD100) ranging from 1-8 MU/20g body weight when injected with a partially purified PSP intra peritoneally. Exceptionally, several fishes such as a goby Acanthogobius flavimanus (LD100, 9-17 MU/20g) and puffer Fugu niphobles (14-29 MU/20g) were resistant significantly. On the other hand, all the fishes tested showed much higher resistibility against PSP when administered orally: e. g., the LD100 value was 320-400 MU/20g in rainbow trout Salmo gairdneri and >400 MU/20g in tilapia Tilapia nilotica, 540-600 MU/20g in flatfish Limanda herzensteini, and > 1,700 MU/20g in tigerfish Therapon jarbua. This indicates that the fish generally is endowed with some defense mechanism against PSP.
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