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Long-term changes in the population size and geographical distribution of Pennella sp. (Copepoda) on the saury, Cololabis saira, in the western North Pacific Ocean and adjacent seas
Nagasawa, K.; Imai, Y.; Ishida, K. (1988). Long-term changes in the population size and geographical distribution of Pennella sp. (Copepoda) on the saury, Cololabis saira, in the western North Pacific Ocean and adjacent seas, in: Boxshall, G.A. et al. (Ed.) Biology of copepods: Proceedings of the Third International Conference on Copepoda. Developments in Hydrobiology, 47: pp. 571-577. hdl.handle.net/10.1007/978-94-009-3103-9_67
In: Boxshall, G.A.; Schminke, H.K. (Ed.) (1988). Biology of copepods: Proceedings of the Third International Conference on Copepoda. Developments in Hydrobiology, 47. Kluwer Academic Publishers: Dordrecht. ISBN 90-6193-654-3. XII, 639 pp., more
In: Dumont, H.J. (Ed.) Developments in Hydrobiology. Kluwer Academic/Springer: The Hague; London; Boston; Dordrecht. ISSN 0167-8418, more

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Keywords
    Cololabis saira (Brevoort, 1856) [WoRMS]; Pennella Oken, 1815 [WoRMS]; Marine
Author keywords
    Pennella sp.; population biology

Authors  Top 
  • Nagasawa, K.
  • Imai, Y.
  • Ishida, K.

Abstract
    Changes in the population size and geographical distribution of the mesoparasitic copepod Pennella sp. (Siphonostomatoida: Pennellidae) on the saury. Cololabis saira, were studied for a period of six years (1981–86) in the western North Pacific Ocean and adjacent seas. The parasite was first recorded in the western North Pacific in 1981. Its population size increased rapidly in 1982–83 and declined slightly in 1984. During these years, infected fish were widely distributed in the western and central North Pacific and also found in the Sea of Okhotsk and the Sea of Japan. However, the population declined dramatically in 1985 and its distributional range was reduced. The parasite disappeared in 1986. The observed frequency distributions of parasites on the host population were the Poisson in 1981 and 1985, but those during 1982–1984 were over-dispersed and fitted the negative binomial.

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