Seasonal variability in the gut ultrastructure of the parasitic copepod 
Neoergasilus japonicus (Copepoda, Poecilostomatoida)

Baud, A.; Cuoc, C.; Grey, J.; Chappaz, R.; Alekseev, V.

doi:10.1139/Z04-149

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Seasonal variability in the gut ultrastructure of the parasitic copepod Neoergasilus japonicus (Copepoda, Poecilostomatoida)

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Grey, J.
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Alekseev, V.
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Citation

Baud, A., Cuoc, C., Grey, J., Chappaz, R., & Alekseev, V. (2004). Seasonal variability in the gut ultrastructure of the parasitic copepod Neoergasilus japonicus (Copepoda, Poecilostomatoida). Canadian Journal of Zoology-Revue Canadienne de Zoologie, 82(10), 1655-1666. doi:10.1139/Z04-149.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-DA7B-B

Abstract

The gut structure and ultrastructure of Neoergasilus japonicus (Harada, 1930), a copepod from the family Ergasilidae (Copepoda, Poecilostomatoida) and a parasite of fish, were compared at different periods of the life cycle: in free-living specimens in October and after attaching to fish in January and June. Differences in the depth of the intestinal epithelium were prominent and other cellular characteristics appeared seasonally variable. We relate these to changes in the physiological activity. Preliminary data from stable-isotope analyses of attached specimens suggest nutritional contribution from parasitism. The possibility of a diapause in the life cycle, as well as the relationship between the morphology of the gut and early evolutionary parasitism of N. japonicus, are discussed.