Species richness and diversity of the parasites of two predatory fish species – perch (Perca fluviatilis Linnaeus, 1758) and zander (Sander lucioperca Linnaeus, 1758) from the Pomeranian Bay
Species richness and diversity of the parasites of two predatory fish species – perch (Perca fluviatilis Linnaeus, 1758) and zander (Sander lucioperca Linnaeus, 1758) from the Pomeranian Bay
Pomeranian Bay as an ecotone is a transition zone between two different biocenoses, which is
characterized by an increase in biodiversity and species density. Therefore, Pomeranian Bay is a destination of finding
and reproductive migrations of fish from the rivers entered the area. The aim of the study was to compare parasitic fauna
of two predatory fish species from the Pomeranian Bay, collected from the same fishing grounds at the same period. A
total of 126 fish studied (53 perches and 73 zanders) were collected in the summer 2013. Parasitological examinations
included: skin, fins, gills, vitreous humour and lens of the eye, mouth cavity, body cavity and internal organs. Apart
from the prevalence and intensity of infection (mean, range) the parasite communities of both fish species were
compared. European perch and zander were infected with parasites from five different taxonomic units. The most
numerous parasites were Diplostomum spp. in European perch and Bucephalus polymorphus in zander. The prevalence of infection of European perch ranged from 5.7% (Diphyllobothrium latum) to 22.3% (Diplostomum spp.) and for zander from 1.4% (Ancyrocephalus paradoxus, Hysterothylacium aduncum) to 12.3% (Bucephalus polymorphus). Different composition of the parasitic fauna is likely due to the different biology of both fish species.
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