曳網速度の違いによるプランクトンネット採集効率の差

中村 元彦

doi:10.2331/suisan.58.861

中村元彦

著者情報

ジャーナルフリー

1992 年 58 巻 5 号 p. 861-869

DOI https://doi.org/10.2331/suisan.58.861

詳細

発行日: 1992/05/25 受付日: 1991/09/24 J-STAGE公開日: 2008/02/29 受理日: - 早期公開日: - 改訂日: -
訂正情報
訂正日: 2008/02/29 訂正理由: - 訂正箇所: 論文抄録訂正内容: Wrong : The catch efficiency of a 24.9cm BONGO net on anchovy larvae Engrauris japonicus was examined at three different towing speeds: low speed (about 0.8m/sec: L), middle speed (about 1.3m/sec: M), and high speed (about 1.8m/sec: H). The ratio of catch efficiency, which is equivalent to capture probability multiplied by mesh retention, was calculated at M speed to at H speed (E_m/E_H) and at L speed to at H speed (E_L/E_H) from the catch data of larvae.
In the daytime, E_L/E_H decreases as the size of the larvae increases, and this value was 0.94-1.09 over an interval of 2.5-3.5mm in S.L., and 0.67-0.87 over an interval of 4.5-9.5mm in S.L. Although E_M/E_H in the daytime decreases as the size of larvae over 7.5mm in S.L. increases, it is bigger than 1, 1.04-1.49, over an interval of 2.5-6.5mm in S.L. At night, E_L/E_Hchanges a little, 0.93-1.12, over an interval of 2.5-8.5mm in S.L. and decreases as the size of the larvae over 9.5mm increases in S.L. These results suggest that capture probability does not always increase as the towing speed increases, and that small larvae can not avoid plankton nets at night.
Right : The catch efficiency of a 24.9cm BONGO net on anchovy larvae Engrauris japonicus was examined at three different towing speeds: low speed (about 0.8m/sec: L), middle speed (about 1.3m/sec: M), and high speed (about 1.8m/sec: H). The ratio of catch efficiency, which is equivalent to capture probability multiplied by mesh retention, was calculated at M speed to at H speed (E_M/E_H) and at L speed to at H speed (E_L/E_H) from the catch data of larvae.
In the daytime, E_L/E_H decreases as the size of the larvae increases, and this value was 0.94-1.09 over an interval of 2.5-3.5mm in S.L., and 0.67-0.87 over an interval of 4.5-9.5mm in S.L. Although E_M/E_H in the daytime decreases as the size of larvae over 7.5mm in S.L. increases, it is bigger than 1, 1.04-1.49, over an interval of 2.5-6.5mm in S.L. At night, E_L/E_Hchanges a little, 0.93-1.12, over an interval of 2.5-8.5mm in S.L. and decreases as the size of the larvae over 9.5mm increases in S.L. These results suggest that capture probability does not always increase as the towing speed increases, and that small larvae can not avoid plankton nets at night.

訂正日: 2008/02/29 訂正理由: - 訂正箇所: PDFファイル訂正内容: -

抄録

The catch efficiency of a 24.9cm BONGO net on anchovy larvae Engrauris japonicus was examined at three different towing speeds: low speed (about 0.8m/sec: L), middle speed (about 1.3m/sec: M), and high speed (about 1.8m/sec: H). The ratio of catch efficiency, which is equivalent to capture probability multiplied by mesh retention, was calculated at M speed to at H speed (E_M/E_H) and at L speed to at H speed (E_L/E_H) from the catch data of larvae.
In the daytime, E_L/E_H decreases as the size of the larvae increases, and this value was 0.94-1.09 over an interval of 2.5-3.5mm in S.L., and 0.67-0.87 over an interval of 4.5-9.5mm in S.L. Although E_M/E_H in the daytime decreases as the size of larvae over 7.5mm in S.L. increases, it is bigger than 1, 1.04-1.49, over an interval of 2.5-6.5mm in S.L. At night, E_L/E_Hchanges a little, 0.93-1.12, over an interval of 2.5-8.5mm in S.L. and decreases as the size of the larvae over 9.5mm increases in S.L. These results suggest that capture probability does not always increase as the towing speed increases, and that small larvae can not avoid plankton nets at night.

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