Feeding of a Pelagic Chaetognath, <I>Sagitta nagae</I> ALVARIÑO in Suruga Bay, Central Japan
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概要
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The feeding of <I>Sagitta nagae, </I> the most predominant chaetognath species in Suruga Bay, was studied. Specimens were collected with ORI-100 net (1.0mm in mesh aperture) and MTD net (0.35mm in mesh aperture) and were fixed with neutralized formalin. The main food organisms of<I>Sagitta nagae</I>were the copepods, <I>Candacia bipinnata, Calanus pacificus</I> and <I>Pareuchaeta russelli</I>. The food-containing ratio (PIT, %) was higher at night and lower in the daytime. Here, P is the number of <I>Sagitta</I> containing food organisms in the gut and T is the total number of <I>Sagitta</I> examined. P/T was almost constant vertically in the upper 100m layer. P/T was generally influenced neither by food density nor by the copepod numbers per <I>Sagitta</I> in this study. <I>Sagitta nagae</I> took food throughout life. Food ingested by <I>Sagitta</I> per day was calculated as 37.6% of <I>Sagitta</I> in dry weight.
- 日本海洋学会の論文
日本海洋学会 | 論文
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