Latitudinal variation in egg size and number in anadromous masu salmon Oncorhynchus masou

Authors

  • K. Morita,

    Corresponding author
    1. * Hokkaido National Fisheries Research Institute, Kushiro 085-0802, Japan, Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-0809, Japan, § Ishikawa Prefecture Fisheries Research Center, Noto, Ishikawa 927-0435, Japan, Toyama Prefectural Fisheries Research Institute, Agricultural, Forestry & Fisheries Research Center, Fisheries Research Institute, Namerikawa, Toyama 936-8536, Japan, Akita Prefectual Fisheries Promotion Center, Oga, Akita 010-0531, Japan, # Japan Sea National Fisheries Research Institute, Niigata 951-8121, Japan and ** National Salmon Resources Center, Sapporo 062-0922, Japan
      †Tel.: +81 154 92 1715; fax: +81 154 91 9355; email: moritak@affrc.go.jp
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  • T. Tamate,

    1. * Hokkaido National Fisheries Research Institute, Kushiro 085-0802, Japan, Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-0809, Japan, § Ishikawa Prefecture Fisheries Research Center, Noto, Ishikawa 927-0435, Japan, Toyama Prefectural Fisheries Research Institute, Agricultural, Forestry & Fisheries Research Center, Fisheries Research Institute, Namerikawa, Toyama 936-8536, Japan, Akita Prefectual Fisheries Promotion Center, Oga, Akita 010-0531, Japan, # Japan Sea National Fisheries Research Institute, Niigata 951-8121, Japan and ** National Salmon Resources Center, Sapporo 062-0922, Japan
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  • Y. Sugimoto,

    1. * Hokkaido National Fisheries Research Institute, Kushiro 085-0802, Japan, Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-0809, Japan, § Ishikawa Prefecture Fisheries Research Center, Noto, Ishikawa 927-0435, Japan, Toyama Prefectural Fisheries Research Institute, Agricultural, Forestry & Fisheries Research Center, Fisheries Research Institute, Namerikawa, Toyama 936-8536, Japan, Akita Prefectual Fisheries Promotion Center, Oga, Akita 010-0531, Japan, # Japan Sea National Fisheries Research Institute, Niigata 951-8121, Japan and ** National Salmon Resources Center, Sapporo 062-0922, Japan
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  • Y. Tago,

    1. * Hokkaido National Fisheries Research Institute, Kushiro 085-0802, Japan, Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-0809, Japan, § Ishikawa Prefecture Fisheries Research Center, Noto, Ishikawa 927-0435, Japan, Toyama Prefectural Fisheries Research Institute, Agricultural, Forestry & Fisheries Research Center, Fisheries Research Institute, Namerikawa, Toyama 936-8536, Japan, Akita Prefectual Fisheries Promotion Center, Oga, Akita 010-0531, Japan, # Japan Sea National Fisheries Research Institute, Niigata 951-8121, Japan and ** National Salmon Resources Center, Sapporo 062-0922, Japan
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  • T. Watanabe,

    1. * Hokkaido National Fisheries Research Institute, Kushiro 085-0802, Japan, Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-0809, Japan, § Ishikawa Prefecture Fisheries Research Center, Noto, Ishikawa 927-0435, Japan, Toyama Prefectural Fisheries Research Institute, Agricultural, Forestry & Fisheries Research Center, Fisheries Research Institute, Namerikawa, Toyama 936-8536, Japan, Akita Prefectual Fisheries Promotion Center, Oga, Akita 010-0531, Japan, # Japan Sea National Fisheries Research Institute, Niigata 951-8121, Japan and ** National Salmon Resources Center, Sapporo 062-0922, Japan
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  • H. Konaka,

    1. * Hokkaido National Fisheries Research Institute, Kushiro 085-0802, Japan, Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-0809, Japan, § Ishikawa Prefecture Fisheries Research Center, Noto, Ishikawa 927-0435, Japan, Toyama Prefectural Fisheries Research Institute, Agricultural, Forestry & Fisheries Research Center, Fisheries Research Institute, Namerikawa, Toyama 936-8536, Japan, Akita Prefectual Fisheries Promotion Center, Oga, Akita 010-0531, Japan, # Japan Sea National Fisheries Research Institute, Niigata 951-8121, Japan and ** National Salmon Resources Center, Sapporo 062-0922, Japan
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  • M. Sato,

    1. * Hokkaido National Fisheries Research Institute, Kushiro 085-0802, Japan, Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-0809, Japan, § Ishikawa Prefecture Fisheries Research Center, Noto, Ishikawa 927-0435, Japan, Toyama Prefectural Fisheries Research Institute, Agricultural, Forestry & Fisheries Research Center, Fisheries Research Institute, Namerikawa, Toyama 936-8536, Japan, Akita Prefectual Fisheries Promotion Center, Oga, Akita 010-0531, Japan, # Japan Sea National Fisheries Research Institute, Niigata 951-8121, Japan and ** National Salmon Resources Center, Sapporo 062-0922, Japan
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  • Y. Miyauchi,

    1. * Hokkaido National Fisheries Research Institute, Kushiro 085-0802, Japan, Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-0809, Japan, § Ishikawa Prefecture Fisheries Research Center, Noto, Ishikawa 927-0435, Japan, Toyama Prefectural Fisheries Research Institute, Agricultural, Forestry & Fisheries Research Center, Fisheries Research Institute, Namerikawa, Toyama 936-8536, Japan, Akita Prefectual Fisheries Promotion Center, Oga, Akita 010-0531, Japan, # Japan Sea National Fisheries Research Institute, Niigata 951-8121, Japan and ** National Salmon Resources Center, Sapporo 062-0922, Japan
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  • K. Ohkuma,

    1. * Hokkaido National Fisheries Research Institute, Kushiro 085-0802, Japan, Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-0809, Japan, § Ishikawa Prefecture Fisheries Research Center, Noto, Ishikawa 927-0435, Japan, Toyama Prefectural Fisheries Research Institute, Agricultural, Forestry & Fisheries Research Center, Fisheries Research Institute, Namerikawa, Toyama 936-8536, Japan, Akita Prefectual Fisheries Promotion Center, Oga, Akita 010-0531, Japan, # Japan Sea National Fisheries Research Institute, Niigata 951-8121, Japan and ** National Salmon Resources Center, Sapporo 062-0922, Japan
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    • ††

      Present address: Fisheries and Fishing Port Division of Agriculture, Forestry and Fisheries Department, Toyama Prefectural Government, Shinsogawa, Toyama 930-8501, Japan.

  • T. Nagasawa

    1. * Hokkaido National Fisheries Research Institute, Kushiro 085-0802, Japan, Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-0809, Japan, § Ishikawa Prefecture Fisheries Research Center, Noto, Ishikawa 927-0435, Japan, Toyama Prefectural Fisheries Research Institute, Agricultural, Forestry & Fisheries Research Center, Fisheries Research Institute, Namerikawa, Toyama 936-8536, Japan, Akita Prefectual Fisheries Promotion Center, Oga, Akita 010-0531, Japan, # Japan Sea National Fisheries Research Institute, Niigata 951-8121, Japan and ** National Salmon Resources Center, Sapporo 062-0922, Japan
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†Tel.: +81 154 92 1715; fax: +81 154 91 9355; email: moritak@affrc.go.jp

Abstract

Latitudinal variation in egg size and number in anadromous masu salmon Oncorhynchus masou was examined. Relatively greater variation in egg size occurred among rivers than among females within rivers or within females. Egg size was generally greater and egg number generally lower at more northerly latitudes.

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