Abstract
During the BMB/ICES Workshop on “Fish Diseases and Parasites in the Baltic Sea”, 25 November to 8 December 1994, samples of herring Clupea harengus and sprat Sprattus sprattus taken along a transect from the southwestern to the northeastern Baltic Sea were examined externally for the presence of symptoms of diseases and emaciation, and internally for infestation with Anisakis simplex. The results indicate significant geographical differences in the prevalence of all three symptoms in herring, but the interpretation is complicated by the apparent size dependence. This was not the case for sprat, but the much lower prevalence of diseases and emaciation may have prohibited the detection of a significant effect.
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