Infestation of the Pacific cod Gadus macrocephalus by the parasitic copepod Haemobaphes diceraus (Copepoda: Pennellidae) at the eastern coast of the northern Kuril Islands and Southeast Kamchatka

Infestation of the Pacific cod Gadus macrocephalus by the parasitic copepod Haemobaphes diceraus... Material was collected in 1997–1999, 2002, and 2006 at the eastern coast of the northern Kuril Islands and at the southeastern extremity of Kamchatka. The prevalence of infection by the parasitic copepod Haemobaphes diceraus in the cod Gadus macrocephalus during the study period averaged 22.2%. The intensity of H. diceraus infection was up to 6 ind/fish, and it increased with decrease in the average and greatest body length of the cod. With increase in fish body length, the role of the fourth branchial arch as the attachment site of the parasite decreased and the importance of the second branchial arch increased. Pacific cod mainly become infected by H. diceraus at depths of 101–150 m. A sharp increase in the occurrence of chitinized remains of this parasite occurred in fish starting with the 41–45 cm size group. The death rate of infected cod up to 40 cm long was 14.3%. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

Infestation of the Pacific cod Gadus macrocephalus by the parasitic copepod Haemobaphes diceraus (Copepoda: Pennellidae) at the eastern coast of the northern Kuril Islands and Southeast Kamchatka

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Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2010 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Freshwater & Marine Ecology
ISSN
1063-0740
eISSN
1608-3377
D.O.I.
10.1134/S1063074010010049
Publisher site
See Article on Publisher Site

Abstract

Material was collected in 1997–1999, 2002, and 2006 at the eastern coast of the northern Kuril Islands and at the southeastern extremity of Kamchatka. The prevalence of infection by the parasitic copepod Haemobaphes diceraus in the cod Gadus macrocephalus during the study period averaged 22.2%. The intensity of H. diceraus infection was up to 6 ind/fish, and it increased with decrease in the average and greatest body length of the cod. With increase in fish body length, the role of the fourth branchial arch as the attachment site of the parasite decreased and the importance of the second branchial arch increased. Pacific cod mainly become infected by H. diceraus at depths of 101–150 m. A sharp increase in the occurrence of chitinized remains of this parasite occurred in fish starting with the 41–45 cm size group. The death rate of infected cod up to 40 cm long was 14.3%.

Journal

Russian Journal of Marine BiologySpringer Journals

Published: Apr 7, 2010

References

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