イワシとその食餌フランクトンとの関係-II

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書誌事項

タイトル別名
  • Relation between the Sardine and the Food Plankton-II
  • イワシ ト ソノ ショクジ プランクトン ト ノ カンケイ 2
  • On the Feeding Mechanism of <i>Sardinops melanosticta</i>
  • マイワシの攝餌機構について

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抄録

1. The Sardine seems to strain plankton, by swimming with opening mouth and further controlling the swimming velocity and the diameter of the mouth, so as to make the velocity of current on the gill-rakers the optimum velocity (about 2-3cm./sec.). Therefore, the feeding velocity of the sardine seems to be proportional to the surface of the gill-rakers, when the plankton dencity in the water is constant.<br> 2. By whether the time, which the gill-rakers require to be closed by plankton, is short or long, the sardine seems to recognize the plankton density in the water where it is feeding, in a short time (about one minute).<br> 3. The secondary concentration for the plankton gathered by the gill-rakers in the oral cavity seems to be performed by “the pharyngeal pockets” and “the pharyngeal rakers”.

収録刊行物

  • 日本水産学会誌

    日本水産学会誌 21 (7), 467-470, 1955

    公益社団法人 日本水産学会

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