ABSTRACT
The infestation dynamic of the sprat (Sprattus sprattus balticus), the Baltic herring (Clupea harengus membras), and the Baltic cod (Gadus morhua callaris) with nematodes Contracaecum osculatum 1 (Anisakidae) from Russian waters of the South Baltic were studied in 2000-2012. Peculiarities of larval growth in different hosts were analyzed. A total of 6233 fish specimens were investigated, including 1420, 3867, and 946 specimens of sprat, herring, and cod, respectively. The prevalence and mean intensity indices of sprat, herring, and cod constituted 1.27 ± 1 0.3% and 1.0, 1.4 ± 0.19% and 1.13 ± 0.38, and 11.63 ± 1.04% and 5.62 ± 8.00, respectively. The increasing of infection indices was observed in recent years. It was associated with the increase in the number of grey seals, definitive hosts of C. osculatum in the Baltic Sea. The growth of helminthes larvae in sprats, Baltic herrings, and cods was revealed. The important role of the sprat in the cod infestation with C. osculatum and in the transmission of this parasite was demonstrated for the first time.
Subject(s)
Fish Diseases/epidemiology , Fish Diseases/parasitology , Fishes/parasitology , Nematoda/physiology , Nematode Infections/epidemiology , Nematode Infections/veterinary , Animals , Larva/physiology , Oceans and Seas/epidemiology , RussiaABSTRACT
Data on 13 species of fish myxosporeans from the Antarctic part of the Atlantic Ocean is present. Among them, 8 new species are described: Zschokkella australis sp. n., Davisia nototheniae sp. n., Ceratomyxa orthospora sp. n., C. ellipsoidea sp. n., C. antarctica sp. n., Leptotheca ampla sp. n., Pseudalataspora squamifrons sp. n., P. meridionalis sp. n.). Four species were found for the first time in the region and four species were found in new hosts.
Subject(s)
Eukaryota/isolation & purification , Fishes/parasitology , Animals , Antarctic Regions , Eukaryota/classification , Eukaryota/cytology , Fish Diseases/parasitology , Food Industry , Gallbladder/parasitology , Kidney/parasitology , Muscle, Skeletal/parasitology , Protozoan Infections, Animal/parasitology , Species Specificity , Urinary Bladder/parasitologyABSTRACT
Two new genera of the lepocreadiid trematodes, Gibsonia gen. n., (type species--G. hastata sp. n.) from Macrourus carinatus Günther, 1878 (Macrouridae), collected in the Falkland Islands area, and Muraenolepitrema gen. n. (type species--M. magnatestis sp. n.) from Muraenolepis microps Lönnberg, 1905 (Muraenolepidae), collected in the South Georgia Island area, are described. Gibsonia gen. n. differs from all known genera of the family Lepocreadiidae by unusual body shape divided into 2 parts, suctorial formations, great number of glandular cells and a muscular bulge of the body sides; it differs from the closely related genus Lepidapedon by separate genital pores. Muraenolepitrema gen. n. differs from Myzoxenus by bursa shape, separate genital pores, lobed shape of genital organs.
Subject(s)
Fishes/parasitology , Trematoda/classification , Animals , Atlantic Islands , Intestines/parasitology , Trematoda/anatomy & histology , Trematoda/isolation & purificationABSTRACT
Two new species of Acanthocephala of the genus Echinorhynchus were found and described from fishes of Falkland-Patagonia and South Georgia Island area. E. longiproboscis sp. n. from Dissostichus eleginoides and Macrourus holotrachys intestines differs from its close relative E. gadi (Zoega in Müller, 1776) in proboscis armature and the proboscis to the body length ratio. E. georgianus sp. n. from D. eleginoides intestines differs from E. gadi in proboscis armature and length and shape of the basal hooks.
