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Genetic and morphological variation in Pennella sp. (Copepoda: Siphonostomatoida) collected from Pacific saury, Cololabis saira

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Abstract

In this paper, we describe three morphotypes of large parasitic copepods identified as Pennella Oken, 1815 (Siphonostomatoida, Pennellidae), which are found on the commercial fish Pacific saury Cololabis saira (Brevoort, 1856) (Beloniformes, Scomberesocidae). Of three morphotypes (Pennella sp. (PSP), parasite A (PA), and indeterminate individuals (IDI)), PSP had feather-like abdominal brushes and egg sacs which were characters typical of Pennella, PA lacked abdominal brushes and egg sacs, and IDI had few abdominal brushes but no egg sacs. Nucleotide sequence differences of mitochondrial cytochrome oxidase subunit I (COI) and nuclear ribosomal internal transcribed spacer 1 (ITS1) regions between types were small and comparable with differences within a type, indicating that the three types were conspecific. Mean body length of PSP was significantly larger than those of PA and IDI, suggesting types PA and IDI were immature morphs of PSP or individuals that had ceased development prior to maturation.

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Acknowledgments

We thank the crews of the T/S Hokuho-maru from the Hokkaido Board of Education and the R/V Hokko-maru from Hokkaido National Fisheries Research Institute. We thank Dr. Dharmamony Vijai, Hachinohe Station, Tohoku National Fisheries Research Institute, for reviewing the manuscript. We also thank Dr. Kazuo Ogawa, Meguro Parasitological Museum, for access to closed-storage specimens of Pennella sp., and Dr. Masayasu Nakagami, Japan Fisheries Research and Education Agency, for assistance with collection of Pennella sp. We thank Ms. Junko Momosawa, Ms. Naoko Kubo, and Ms. Kanae Okabori of the Hachinohe station of the Tohoku National Fisheries Research Institute, for measuring Pacific saury and counting of Pennella sp.

Funding

This work was partially supported by the Fisheries Agency of Japan.

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Authors and Affiliations

  1. Hachinohe Station, Tohoku National Fisheries Research Institute, Japan Fisheries Research and Education Agency, 25-259 Shimomekurakubo, Same, Hachinohe, Aomori, 031-0841, Japan

    Satoshi Suyama

  2. Miyagi Prefecture Fisheries Research and Development Center, 97-6 Sodenohama, Watanoha, Ishinomaki, Miyagi, 986-2135, Japan

    Yoshio Masuda

  3. National Research Institute of Fisheries Science, Japan Fisheries Research and Education Agency, 2-12-4 Fukuura, Yokohama, Kanagawa, 236-8648, Japan

    Takashi Yanagimoto & Seinen Chow

Authors
  1. Satoshi Suyama
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  2. Yoshio Masuda
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  3. Takashi Yanagimoto
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  4. Seinen Chow
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Correspondence to Satoshi Suyama.

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The authors declare that they have no conflict of interest.

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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed by the authors.

Sampling and field studies

All necessary permits for sampling and observational field studies have been obtained by the authors from the competent authorities and are mentioned in the acknowledgements, if applicable.

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Communicated by H. Stuckas

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Suyama, S., Masuda, Y., Yanagimoto, T. et al. Genetic and morphological variation in Pennella sp. (Copepoda: Siphonostomatoida) collected from Pacific saury, Cololabis saira. Mar Biodiv 49, 1233–1245 (2019). https://doi.org/10.1007/s12526-018-0901-x

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  • DOI: https://doi.org/10.1007/s12526-018-0901-x

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