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The present paper provides a detailed description of a new species of Monogenea-Dactylogyrus triappendixis, parasitic on gills of tench, Tinca tinca (L.) from the lakes of north-west Poland. The above-mentioned species differs from its congeners, parasitizing the tench, with details of the male copulatory organ and armament of the vagina. It is a frequent parasite of the tench in the water bodies studied, at the temperature of about 18°C.
Polymorphic blood image of the horses was used to determine genetic distances between groups of horses of different colour. The study covered 1247 half–bred horses, for which the polymorphism of albumin (Al), transferrin (Tf), alkaline esterase (EspH 8.5), vitamin D binding protein (Gc) and Xk protein were determined. The analysis of genetic distance demonstrated that the studied groups of horses were considerably genetically separated depending on the colour. This allows concluding that there is an association between genetic polymorphism of some blood proteins and the coat colour of horses.
In the tench collected from three lakes of the north-western region of Poland, namely: lake Ińsko, lake Mielno, and lake Woświn, a total of 20 parasite species was recorded. Representatives of the following species were commonly found: Ichthyophthirius multifiliis, Dactylogyrus triappendixis, Asymphylodora tincae and Ergasilus sieboldi (the prevalence ranged from 34.37 to 65.62%). Trypanosoma sp., Myxobolus ellipsoides, Trichodina sp., Trichodinella epizootica, metacercariae of Tylodelphys clavata and Skrjabillanus tincae were recorded relatively often (18.75-28.12%). The presence of Thelohanellus pyriformis, Caryophyllaeus laticeps, egss of Sanguinicola sp., metacercariae of Diplostomum sp., and larvae of Raphidascaris acus (9.37% of infection) were recorded less frequently. The remaining parasites, namely: Philomerta ovata, Piscicola geometra, Acanthocephalus anguillae, A. lucii, and Argulus foliaceus occurred as single specimens (3.12% of infection). Protozoans T. epizootica and nematodes P. ovata were recorded for the first time in the tench in Poland, whereas 18 species of parasites have not been noted yet in the north-western region of the country.
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