Swimming depths of the giant jellyfish Nemopilema nomurai investigated using pop-up archival transmitting tags and ultrasonic pingers

スポンサーリンク

概要

• 論文の詳細を見る

• The swimming depths of 12 individual Nemopilema nomurai with bell diameters of 0.8-1.6 m were investigated using pop-up archival transmitting tags and ultrasonic pingers, and the validity of the research method was evaluated. The N. nomurai studied frequently showed vertical movement, with the swimming depth ranging from 0 to 176 m, The mean swimming depths of most individuals were less than 40 m. The swimming depths of N. nomurai in the northern Japan Sea in the winter were mostly deeper than those of this species in the southern Japan Sea in the autumn. This result suggests that the range of the depths almost depends on the vertical structure of the ocean. Swimming depths during the nighttime were significantly deeper than those during the daytime. More specifically, during the daytime, the swimming depths in the afternoon tended to be shallower than those in the morning, while during the nighttime, the swimming depths after midnight were deeper than those before midnight.エチゼンクラゲ計12個体の遊泳深度をポップアップタグや超音波発信器により調べるとともに，調査手法の妥当性を確認した。エチゼンクラゲは活発な鉛直移動を繰り返していた。遊泳深度は0～176m の範囲で，ほとんどの個体の平均遊泳深度は40m より浅かった。遊泳深度は秋の日本海南部よりも冬の日本海北部の方が深くなる傾向があり，基本的に滞在深度範囲は海洋の鉛直構造に依存していると推測された。遊泳深度は日中よりも夜間の方が深かった。日中には午前より午後の方が浅く，夜間には前半夜よりも後半夜の方が深くなる日周性が確認された。

• 2009-07-01

著者

• HONDA Naoto

  National Research Institute of Fisheries Engineering, Fisheries Research Agency

• WATANABE Toshihiro

  Headquarters of the Fisheries Research Agency

• MATSUSHITA Yoshiki

  Faculty of Fisheries, Nagasaki University

• Honda Naoto

  National Research Institute Of Fisheries Engineering Fisheries Research Agency

• Matsushita Yoshiki

  Faculty Of Fisheries Nagasaki University

• Watanabe Toshihiro

  Headquarters Of The Fisheries Res. Agency Kanagawa Jpn

関連論文

• Swimming depths of the giant jellyfish Nemopilema nomurai investigated using pop-up archival transmitting tags and ultrasonic pingers
• Analysis of mesh breaking loads in cotton gill nets: Possible solution to ghost fishing
• Relationship between soak time and number of enmeshed animals in experimentally lost gill nets
• Visual contrast threshold of striped beak-perch Oplegnathus fasciatus
• Automated acoustic method for counting and sizing farmed fish during transfer using DIDSON

スポンサーリンク