Prey choice order of Crangon uritai as a predator for juvenile Pleuronectes yokohamae

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概要

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• During the spring in the coastal waters of Hakodate Bay the shrimp Crangon uritai is the predominant predator on larval and juvenile marbled sole, Pleuronectes yokohamae. To investigate the prey preferences of C. uritai, P. yokohamae and two other prey species, a mysid Nipponomysis sp. and a gammarid Haustorioides japonicus, were used for predation experiments. Among the three prey organisms studied, Nipponomysis sp. was preyed on first, followed by P. yokohamae, and finally H. japonicus. Prey profitability did not differ between P. yokohamae and Nipponomysis sp., though H. japonicus was less profitable. Nipponomysis sp. was larger, more perceptible, and slower to escape than P. yokohamae. A relatively high abundance of mysid Nipponomysis sp. could restrict and reduce predation on P. yokohamae by C. uritai. Gammarid H japonicus was able to escape relatively more easily, because its harder and slippery skin required more handling time than the other prey, possibly making it an undesirable food source for C. uritai. High perceptibility and low escape ability may be the most important factors affecting prey choice of C. uritai.餌種の特性の違いとエビジャコの餌選択の関係を知るために，捕食実験を行った。実験はエビジャコ5個体に対して，マコガレイ稚魚とその他エビジャコの主要な餌であるアミ類の1種Nipponomysis sp.とヨコエビ類の1種ナミノリソコエビを，それぞれ10個体ずつ同時に与えて行った。捕食結果，マコガレイ稚魚はエビジャコにとって処理に時間を要しない餌であるが，底面から離れることがほとんどないため発見されにくく，逃避能力も高いため，Nipponomysis sp.よりも捕食されにくい餌であった。ナミノリソコエビはマコガレイ稚魚に比べて小型であるが，捕獲してから処理に時間を要するため，最も捕食されにくい餌であった。このことからマコガレイ稚魚よりも相対的に目立ちやすく，逃避能力が低く，かつ処理に時間を要しない餌（アミ類）の存在は，エビジャコによるマコガレイ稚魚の被食頻度を低下させていると考えられた。

• 日本水産増殖学会 = Japan Aquaculture Societyの論文

著者

• JOH Mikimasa

  Graduate School of Fisheries Sciences, Hokkaido University

• NAKAYA Mitsuhiro

  Iloilo State College of Fisheries

• Nakagami Masayasu

  Tohoku National Fisheries Research Institute Hachinohe Station Fisheries Research Agency

• Nakagami Masayasu

  Hachinohe Branch Tohoku National Fisheries Research Institute

• Joh Mikimasa

  Graduate School Of Fisheries Sciences Hokkaido University

• Takatsu T

  Hokkaido Univ. Hokkaido

• Nakaya M

  Iloilo State College Of Fisheries

• Takatsu T

  Graduate School Of Fisheries Sciences Hokkaido University

• Takatsu Tetsuya

  Hokkaido Univ. Hokkaido Jpn

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