Guide to the Parasites of Fishes of Canada, Part II: Crustacea

Abstract: GIBSON, D.I. 1996. Trematoda. In: L. Margolis and Z. Kabata (ed.) Guide to the parasites of fishes of Canada. Part IV. Can. Spec. Publ. Fish. Aquat. Sci. 124: 373 pp. More than 80 keys leading to the identification of more than 220 species of trematode parasites of Canadian fishes are provided. Diagnoses of more than 80 family-group taxa and 130 genera are given. Each genus is illustrated. For each species of trematode a Canadian host list, locality data, and any relevant remarks are included. In addition,… Show more

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The discovery of Caligus quadratus Shiino, 1954 (Copepoda: Caligidae) in the Mediterranean Sea, with a new host record and supplementary morphological information obtained using confocal laser scanning microscope (CLSM) and 3D image processing

Influence of the parasitic copepod Haemobaphes diceraus and Clavella perfida on growth and maturity of walleye pollock Theragra chalcogramma

et al. 2004

The effects of infection with parasitic copepods Haemobaphes diceraus and Clavell perfida on the growth and maturity of walleye pollock Theragra Thalcogramma off the coast of eastern Hokkaido, Japan were examined in the feeding season and spawning season. In the feeding season, the condition factor (KF) and hepatic somatic index (HSI) of walleye pollock decreased as the number of H. diceraus increased, but were not related to the number of C. perfida. In the spawning season, the KF, HSI, and gonadic somatic index (GSI) of both sexes of fish decreased as the number of H. diceraus increased. Reproductively spent fish were more often infected with H. diceraus than those of other maturity levels were. No atretic oocytes were detected in the gonads infected with H. diceraus. Histological observation of fish gonads suggests that H. diceraus infection may cause spawning to occur earlier or to be suspended. The lengths of fish at age did not differ between individuals infected with H. diceraus and uninfected ones. The infection rate of H. diceraus increased steadily with age, but no more than three H. dicer aus per host were observed. We conclude that H. diceraus infection significantly influences the reproduction of walleye pollock through the nutritional condition

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