稚魚網による炉水量および採集量の変動について

スポンサーリンク

概要

• 論文の詳細を見る

• The present studys objective has been to clarify the tow to tow variations in the number of fish larvae taken in relation to the variation of the volume of water filtered. More than 230 surface towings and 170 towings of subsurface layers were carried out in the regions off central and southern Japan, and the results obtained are as follows: (1) Volume of water filtered vary from tow to tow, net to net and it is difficult to keep the volume of water filtered to a constant level by only maintaining a constant ship speed and towing time. (2) Collecting efficiency both in number and size appeared better in small meshed nets than large meshed nets at sea areas of poor plankton. However, the difference in the numbers collected diminished at towings in rich plankton waters, and the variation in collection became large with small meshed nets. (3) Variations in collection was large for samples of low collection and this decreased by increasing the amount of collection in numbers. (4) Movement of net during towing was stable at shallow layers and at calm seas and it oscillated to some extent at deeper layers and seas having complexed water stratification.

• 公益社団法人 日本水産学会の論文

著者

• 井田 斉

  Fisheries Department, University Museum, the University of Tokyo

• 井田 斉

  Fisheries Department, Faculty of Agricuiture, The University of Tokyo

関連論文

• 流れ藻に付随する幼稚魚の生態学的研究-II : 幼稚魚の行動および食性と流れ藻との関連について
• 流れ藻に付随する幼稚魚の生態学的研究-I : 流れ藻に付随する幼稚魚の季節変動について
• 本邦南岸域における浮游性幼稚魚の生態
• 稚魚網による炉水量および採集量の変動について

スポンサーリンク