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Feeding habits of Pacific cod larvae and juveniles in Mutsu Bay, Japan

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Title: Feeding habits of Pacific cod larvae and juveniles in Mutsu Bay, Japan
Authors: Takatsu, Tetsuya Browse this author →KAKEN DB
Nakatani, Toshikuni Browse this author →KAKEN DB
Mutoh, Takashi Browse this author
Takahashi, Toyomi Browse this author →KAKEN DB
Keywords: Pacific cod
larvae and juveniles
feeding habits
Mutsu Bay
Issue Date: 1995
Publisher: Japanese Society of Scientific Fisheries
Journal Title: Fisheries Science
Volume: 61
Issue: 3
Start Page: 415
End Page: 422
Publisher DOI: 10.2331/fishsci.61.415
Abstract: The diets and prey widths of Pacific cod (Gadus macrocephalus) larvae and juveniles were examined in Mutsu Bay. In early March, 11 yolk-sac larvae were caught in midwater of the bay mouth. Five of 11 larvae captured had not opened their mouths, and the remaining six had not fed. Post-larvae ≤ 7mm in total length (TL) fed on copepod nauplii, particularly Pseudocalanus nauplii. Prey items of post-larvae >7mm TL were chiefly crustacean eggs, and Pseudocalanus spp. copepodites and adults. From April to June, the main food organisms of cod juveniles were calanoid copepods, and changed from Pseudocalanus spp. to Calanus pacificus, Acartia clausi, and Centropages abdominalis. In addition, cod juveniles opportunistically fed on large-sized food organisms, namely, reptant megalopae, planktonic gastropods, and natant zoeae. In July, cod juveniles mainly fed on benthic prey items, such as gammarid amphipods and fish. It seems probable that these large-sized food organisms play an important role as alternative prey for cod juveniles when they change their main food from calanoid copepods to benthic prey items.
Rights: © 1995 公益社団法人日本水産学会
© 1995 The Japanese Society of Fisheries Science
Type: article
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高橋 豊美

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