9,403,222 research outputs found
Observations on Trypanosoma granulosum Laveran et Mesnil, 1902 (Protozoa, Kinetoplastida), a blood parasite of eel, Anguilla anguilla (L.)
No full textThe results of a comparative study on Trypanosoma granulosum Laveran et Mesnil,1902 in the peripheral blood of eel, Anguilla anguilla from two lakes in north-western Poland are presented. The following parameters were analysed: dependence of the infection parameters on the host′s age and the number of the protozoans in one drop of blood. Hitherto existing data on the morphology of the parasite have been presently supplemented. In addition, the division stages were observed, which indicates that the species can multiply within the fish. Such phenomenon has not been observed in T. granulosum in natural conditions
Hemato- and histopathological changes in the whitefish (Coregonus Albula (L.) invaded by metacercariae of Cotylurus Erraticus (Syn. Ichthyocotylurus)
No full textA histopathological examination of parenchymal organs of the whitefish Coregonus albula (L.) infestcd with metacercariae of Cotylurus erraticus established the extent of inflammation and necrotic changes and justified a possiblity that the fish died as a result of the invasion. The examination revealed damaging inflammation of the cardiac muscle and retrogressive changes in the kidney vrith progressing damage of nephron elements, congestion, and hyperplasia of endoparenchyma of hemopoietic properties. The high pathogenicity of Cotylurus erraticus metacercariae is evidenced by the scope of necrobiotic changes resulting from mechanical damage brought about by penetration, encystment, and intoxication
A preliminary evaluation of health condition of eel Anguilla anguilla (L.) from the Szczecin Lagoon in 1971-1973 and 1982-1983
No full textThe health condition of eel, Anguilla anguilla (L.), caught in the Szczecin Lagoon off Trzebież in 1971-1913 and in 6 fishing grounds in 1982-1983 is evaluated. The clinical analysis, anatomo-pathological examinations, and hematologic parameters demonstrated a considerable increase in the incidence of circulatory disorders involving acute or chronic damaging inflammations, dominated by necropoietic lesions in viscera. The extent of pathologic changes is conditioned by, i.a., toxic effects of cyanobacteria (including Microcystis aeruginosa) blooms occurring in the Lagoon′s eutrophic waters
Hematological, clinical and anatomical pathology of the European eel (Anguilla anguilla (L.)) from polluted waters of northwestern Poland
No full textWithin the years 1970-1973 a total of 820 eel individuals were checked for their health state. The eels were caught in water bodies (Szczecin Lagoon and lakes: Dąbie, Siecino, Czaplinek, and Lipiany) of a different level of pollution. Based on clinical, anatomopathologic, hematologic, and cytologic analyses, the range of exogenous intoxication was determined. The internal organs revealed symptoms of hemocytopathy with acute and chronic damaging inflammations, degenerative and necrobiotic processes prevailing
Myxobolus portucalensis Saraiva & Molnar, 1990 in various organs of eel, Anguilla anguilla (L.)
No full textMorphology of Myxobolus representatives parasitic on the fins and various internal organs of eels, Anguilla anguilla (L.) originating from the Szczecin Lagoon and the Odra River estuary area (Poland) was studied. The sporozoans were found to represent a single species identified as M. portucalensis Saraiva & Molnar, 1990. The infection parameters were determined for the respective organs. The species studied have not been previously reported from the internal organs of the eel and the present record is the first from Poland
Protozoans parasitic on Anguilla anguilla (L.) from the Szczecin Lagoon and River Odra mouth
No full textProtozoans parasitic on Anguilla anguilla (L.) caught in 5 areas o the Szczecin Lagoon and the River Odra mouth were studied in 1982-1983. A total of 11 protozoan species were found: Ichthyophthirius multifliis, Trichophrya piscium, Trichodina jadranica, Trichodinella epizootica, Myxidium giardi, Spironucleus mobilis, Eimeria anguillae, Zschokkella stettinensis, Sphaerospora gilsoni, Trypanosoma granulosum, and Myxobolus sp. Six species were frequent or very common. The parasitic invasion was relatively strong
Metazoan parasites of the eel, Anguilla anguilla (L.) in the Szczecin Lagoon and River Odra mouth area
No full textA total of 183 eel, Anguilla anguilla (L.), individuals (measuring 34-84 cm l.t.) caught from five areas of the Szczecin Lagoon and the River Odra mouth area were examined. They were found to house 13 parasitic species, three of which (Bothriocephalus claviceps, Proteocephalus macrocephalus, and Ergasilus sieboldi) being frequent. Acanthocephalus lucii was a relatively frequent parasite, too. The remaining 9 species, i.e., Azygia lucii, Deropristis inflata, Ichthyocotylurs platycephalus (metacercariae), Raphidascaris acus, Camallanus lacustris, Eustrongylides excisus (larva), Acanthocephalus anguillae, Ergasilus gibbus, and Argulus foliaceus were rather rare. The areas the fish were obtained from differed to some extent in the degree of infection. The lowest number of parasites was found off Lubin (5 species) and in the Odra mouth area (6 species), while fishing grounds off Trzebież yielded the highest number of parasitic species (12). The differences are related to environmental conditions being different in the individual areas
Development of haemogregarines (Apicomplexa), blood parasites of eel, Anguilla anguilla (L.)
No full textHaemogregarines were found in 23 (2.8%) out of 820 eel, Anguilla anguilla (L.) individuals caught in the Szczecin Lagoon and lakes D±bie, Siecino, Drawsko, and Lipiany (north-western Poland). Different developmental stages were present predominantly in the leukocytes and extracellularly; more seldom, they occurred also in the peripheral blood erythrocytes, in the liver, spleen, and kidney. Merogony involving different stages with nuclear chromatin aggregated into 2, 4, 8, 16, 32 and more groups within a cell was followed. During the subsequent differentiation, chromatin shifted to the cell periphery and merozoites (up to 32 and more), attached to the residual body, were formed by separation. The released merozoites were scattered between cells. During gamogony, gamont-resembling forms were formed as a stage terminating development in the fish host
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