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Feeding habits of Pacific pomfret Brama japonica inthe transition zone of the central North Pacific

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We examined the diets of three size groups of the Pacific pomfret Bramajaponica collected in April and May 2000 in the transition zoneof the central North Pacific. Amphipods, cephalopods and fish werethree of the most common prey groups of pomfret. Of the three size groups,small pomfret (11.0–19.9 cm standard length (SL))preyed mainly on amphipods and occasionally on cephalopods (mainlytransitional species Onychoteuthis borealijaponica) and fish.(These prey amphipods and fish could not be identified to lowertaxonomic levels because they were too digested.) Medium and largepomfret (20.0–30.9 and 31.0–40.9 cm SL,respectively) preyed mainly on cephalopods (mainly O. borealijaponica,but also on two subarctic species, namely Berryteuthis anonychus and Gonatopsisborealis), suggesting that these cephalopod species ensure energyfor the northward migration of these two size groups in the transitionzone in the spring. The next most common prey for medium pomfretwas amphipods (mainly subtropical species Phronima sedentaria and Platyscelusovoides), followed by fish (mainly Bathylagus sp.). However,in the case of large pomfret, fish (mainly Paralepididae sp. ‘A’)were the next most common prey, followed by amphipods (mainly P.sedentaria and P. ovoides), indicating that the importanceof fish as prey increases with growth for medium and large pomfret.
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Keywords: Brama japonica; central NorthPacific; onfeeding habits; quantitative analysis; transition zone

Document Type: Research Article

Affiliations: 1: Japan Society for the Promotionof Science, Chiyoda, Tokyo 102-8471, 2: Departmentof Zoology, National Science Museum, Shinjyuku, Tokyo 169-0073 and 3: Ocean Resources Division, National Research Institute of Far Seas Fisheries, Shimizu, Shizuoka424-8633, Japan

Publication date: 2003-04-01

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