Monthly Changes in Food Size of Larval Walleye Pollock Theragra chalcogramma at the Initial Feeding Stage in Funka Bay and Surrounding Vicinity in Hokkaido
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- Nakatani Toshikuni
- Faculty of Fisheries, Hokkaido University
書誌事項
- タイトル別名
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- Monthly Change in Food Size of Larval Walleye Pollock <i>Theragra chalcogramma</i> at the Initial Feeding Stage in Funka Bay and Surrounding Vicinity in Hokkaido
- Monthly Changes in Food Size of Larval
- Monthly change in food size of larval walleye pollock Theragra chalcogramma at the initial feeding stage in Funka Bay and surrounding vicinity in Hokkaido
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抄録
Larvae of walleye pollock Theragra chalcogramma were collected by vertical haulsfrom the sea bottom to the surface with a NORPAC net from January to March 1991 in Funka Bay and surrounding vicinity in Hokkaido. Larvae were abundant in January and decreased in February and March. To clarify the food availability of walleye pollock larvae at the initial feeding stage, the size of food for larvae smaller than 7mm in total length (TL) were measured. The total length of larvae collected in January ranged from 4.2 to 6.5mm. Most of 4.2-5.1mm TL larvae had empty stomachs. Food organisms were found from 7 larvae (4.8-6.5mm TL). Among them, copepod nauplii were dominated (60.5%), followed by invertebrate eggs (25.6%) and copepodids (13.9%). The body width of Oithona nauplii in the stomachs ranged from 84 to 121 μm and Paracalanus nauplius was 103 μm. Larvae of 4.0 to 13.2mm TL were collected in February. Six larvae (<7.0mm TL) fed on copepod nauplii (67.6%), invertebrate eggs (20.6%), copepodids (8.8%), and diatom Coscinodiscus sp. (3.0%). Copepod nauplii in the stomachs were larger than 95 μm in width. In March, food organisms taken by 5 larvae (<7mm TL) consisted of copepod nauplii (54.5%), invertebrate eggs (36.4%), and copepodids (9.1%). The width of copepod nauplii in the stomachs ranged from 156 to 176 μm. From these observations, it is considered that the primary food items of larval walleye pollock at the initial feeding stage are largesized copepod nauplii (>84 μm) in this area.
収録刊行物
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- Fisheries science
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Fisheries science 61 (3), 387-390, 1995
公益社団法人 日本水産学会
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詳細情報 詳細情報について
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- CRID
- 1390001204430382336
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- NII論文ID
- 130003902685
- 10004861960
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- NII書誌ID
- AA10993718
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- NDL書誌ID
- 3644313
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- ISSN
- 09199268
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可