Specifics of Anisakis simplex larvae infection in the Pacific herring Clupea pallasii Valenciennes, 1847 from Lake Tunaicha

The purpose of the research is to analyze specifics of Anisakis simplex larvae infection in the body cavity of the lake Pacific herring in Lake Tunaicha (from materials of 1980 to 1995). Materials and methods. Conventional parasitological methods were used for collecting the material. The dissection recorded the number of nematodes in the fish. Parasitological studies of the herring from Lake Tunaicha (southern Sakhalin) were conducted from 1980 to 1995. A total of 4,438 fish caught in the Krasnoarmeyskaya channel and Lake Tunaicha were examined. Results and discussion. The parasite fauna in the herring from Lake Tunaicha included six parasite species of which two nematode species ( Anisakis simplex l., Hystorethylacium aduncum l.), one acanthocephala species ( Corynosoma strumosum juv.), one trematode species ( Brachyphalus crenatus ) and two parasitic copepod species ( Ergasilus wilsoni and E. hypomesi ). Among all the above species, A. simplex larvae were of greatest interest for study. The helminth is a typical species of the Pacific herring and poses a threat to human and animal health. The results of the studies found no difference in the infection of herring females or males in Lake Tunaicha. A change in the infection rate was demonstrated in the herring by age and linear dimensions depending on the fish life cycle (spawning and wintering migration periods). The first cases were recorded for herrings infected with Anisakis sp. larvae sized from 14 cm.