Regional Differences in the Infection of the European Anchoy <i>Engraulis encrasicolus</i> with the Nematode <i>Hysterothylacium aduncum</i> in the Winter Period of the Crimea and the Caucasus Coasts

Abstract

The main indicators of infestation of European anchovy Engraulis encrasicolus (L.) with larvae of the nematode Hysterothylacium aduncum (Rudolphi, 1802) in winter were studied in two areas of the Black Sea: off the coast of Crimea and the Caucasus. Regional differences in the indicators of invasion intensity and abundance index in two-year-old and three-year-olds were revealed. When analyzing the values of the extensiveness of invasion, no significant differences were found. Three main factors that determine regional differences in anchovy infestation in the studied areas are analyzed.