Ovurstórur fiskadeyði íalibrúki á Tjaldavík orsakaður av einum Gonyaulax excavata algublóma

Abstract

On the lOth of July 1984 the fjord of Trongisvágur including Tjaldavík cove became brownish-red in colour at the same time
that mortalities among rainbow trout and salmon on a fish-farm in the cove were observed. Three days later the overall
mortality rate was 77% (27 of 35 metric tons). The cause of these heavy mortalities turned out to be the toxic dinoflagellate
Gonyaulax excavata. Since G. excavata is best known as a cause of PSP in mussels, shellfish from a musselbed just inside the
cove were analyzed for PSP and shown to contain 9,000 mouse units PSP per 100 grams of tissue 14 days after the red tide.
Presumably toxin levels were much higher in earlier stages of the bloom. Furthermore, four cases of PSP following consumption of mussels from the fjord were diagnosed retrospectively in the village of Trongisvágur (2,500 inhabitants).