Japanese eel <i>Anguilla japonica</i> and aquatic animals collected with Ishi-kura net in the Iroha and Katsura Rivers, Oita Prefecture, Japan

• HARADA MAMI

  Graduate School of Global Environmental Studies, Kyoto University

• KUME MANABU

  Field Science Education and Research Center, Kyoto University

• MOCHIOKA NORITAKA

  Faculty of Agriculture, Kyushu University

• TAMURA YUJI

  Shallow Sea and Inland Water Section, Fisheries Research Division, Oita Prefectural Agriculture, Forestry and Fisheries Research Center

• KANZAKI TOKO

  Graduate School of Agriculture, Kyoto University

• HASHIGUCHI SHUNYA

  Graduate School of Agriculture, Kyoto University

• KASAI AKIHIDE

  Faculty of Fisheries Sciences, Hokkaido University

• YAMASHITA YOH

  Field Science Education and Research Center, Kyoto University

Bibliographic Information

Other Title

• 大分県国東半島・宇佐地域の伊呂波川と桂川に設置したウナギ石倉かごにより採集されたニホンウナギと水生動物群集
• オオイタケン クニサキハントウ ・ ウサ チイキ ノ イロハガワ ト カツラガワ ニ セッチ シタ ウナギ イシクラカゴ ニ ヨリ サイシュウ サレタ ニホンウナギ ト スイセイ ドウブツ グンシュウ

Abstract

　Local people in Oita Prefecture perform a traditional fishery called the Ishi-kura fishing method in estuaries. Ishi-kura is an underwater pile of approximately 0.5 tons of stones 15-30 cmin diameter, and wild eels dwell inside the pile and are caught using nets. We examined the relationship between Japanese eel Anguilla japonica and aquatic animals caught with an Ishi-kura net which was modified for aquatic animal research, in the Iroha and Katsura Rivers, Oita Prefecture, Japan. Based on community structure analysis, the aquatic animal community in the Ishi-kura net consisting of 54 taxonomic animals was divided into two groups by distance from the river month and substrate; the upstream group mainly contained the genus Hemigrapsus and genus Batillaria, and the downstream one predominantly contained Macrobrachium nipponense and Clithon retropicta. Based on stomach content analysis, 39 out of 79 eels consumed the same aquatic animal groups found in Ishi-kura. However, eels inhabiting downstream mainly preyed on mud shrimp, and those inhabiting upstream predominantly fed on crab, suggesting that eels may not use Ishi-kura for feeding but for living space. These findings suggest that Ishi-kura nets may be useful for monitoring eels as well as aquatic animals as their potential prey items.

Journal

• NIPPON SUISAN GAKKAISHI

  NIPPON SUISAN GAKKAISHI 84 (1), 45-53, 2018

  The Japanese Society of Fisheries Science

Keywords

• 石倉かご
• 餌生物
• 摂餌生態
• ニホンウナギ
• モニタリング

Details

• CRID: 1390001206423010944
• NII Article ID: 130006315644
• NII Book ID: AN00193422
• DOI: 10.2331/suisan.17-00032
• ISSN: 1349998X
• ISSN: 00215392
• NDL BIB ID: 028839912
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I028839912
• Web Site: https://www.jstage.jst.go.jp/article/suisan/84/1/84_17-00032/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed