Abstract
Male and female sand gobies Pomatoschistus minutus (Pallas) from the Oosterschelde (The Netherlands) were examined for the crustacean mesoparasite Lernaeocera lusci (Bassett-Smith) from Apnl to July 1992. Prevalence increased steeply from 4 % in Apnl to 80% (females) and 57 % (males) in June. The peak abundance of recently attached infective stages (pennella larvae) on sand gobies was found in May. By June, about 70% of parasites were in the post-metamorphosis stage and possessed egg strings. Significant differences in abundance between males and females were found in June but not in May. This may be due to sex-specific differences in behaviour during spawning time. The majority of post-spawning fish probably d ~ e d in July. Fish of the new year class which were captured in July harboured no parasites.
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