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Light and scanning electron microscopical examinations of nematode samples collected from the stomachs and intestines of catfishes Trichomycterus spp. (Trichomycteridae, Siluriformes) from three streams in Colombia revealed the presence of two species, Dentinema trichomycteri n. g., n. sp. (Cosmocercidae) (type-host Trichomycterus sp.) and Procamallanus (Spirocamallanus) chimusensis Freitas & Ibáñez, 1968 (Camallanidae). The new, monotypic genus Dentinema is characterised mainly by the presen...
Gyrodactylus quadratidigitus n. sp. (Monogenea, Gyrodactylidae) is described from the gills, fins and skin of Thorogobius ephippiatus (Lowe) (leopard-spotted goby) from Portland Castle Bay, Dorset, UK. G. quadratidigitus n. sp. most closely resembles the species of Gyrodactylus previously described by Geets from Pomatoschistus microps(Krøyer) in the approximate shape and size of the attachment hooks but can be readily distinguished from other species of the genus by the distinctive square sha...
The hypothesis that enzyme heterozygosity is associated with decreased morphological variance was tested using eight polymorphic loci and three meristic characters in large samples of the plaice, Pleuronectes platessa. The hypothesis was not corroborated and the conclusion drawn that such a relationship although observed by several other workers may not be a general one.
The effects of hydrogen peroxide administered at a concentration of 1500 ppm for 20 min at 7.5 °C on different life-cycle stages of Lepeophtheirus salmonis were examined experimentally. The mobile adult and pre-adult stages of L. salmonis readily reattached to Atlantic salmon after hydrogen peroxide treatment. Adult female lice, but not adult males or pre-adults, reattached in significantly lower numbers than untreated controls. Survival of early chalimus stages (I and II) was not affected by...
Gyrodactylus longipes n. sp. (Monogenea, Gyrodactylidae) is described from the gills of farmed juvenile gilthead seabream (Sparus aurata L.) from two sites located in Italy and Bosnia-Herzegovina and represents the second species of Gyrodactylus to be described from S. aurata. Gyrodactylus orecchiae Paladini, Cable, Fioravanti, Faria, Di Cave et Shinn, 2009 was the first gyrodactylid to be described from S. aurata, from populations cultured in Albania and Croatia. In the current study, G. lon...
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