[Anisakis simplex larvae from the Baltic herring as tag organisms in biological and fisheries research. I. Baltic herring and A. simplex nematodes: the models of parasitic infection and fish migration tags].

Models relating infection intensity with Anisakis simplex larvae to the fish length and weight were developed and applied to estimate the asymptotic size of herring. Generalized linear models (GLM) were used to analyse the prevalence and intensity of infection as dependent on time and area of sampling and the biological parameters of fish. For the characterization of herring populations in the southern Baltic, two complementary approaches were used: morphometric and meristic analyses to quantify the body shape of herring and the presence of parasites as fish migration tags.