Vertical Distribution and Prey of Walleye Pollock in the Northern Japan Sea

Kooka, Kouji; Takatsu, Tetsuya; Kamei, Yoshihiko; Nakatani, Tomoaki; Takahashi, Toyomi

doi:10.2331/fishsci.64.686

Cited by 17 publications

(15 citation statements)

References 11 publications

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“…Both fish were found to consume a large variety of prey items, which is consistent with food habit studies in other parts of their range (Bailey & Dunn 1979, Albers & Anderson 1985, Kooka et al 1998, Yamamura et al 2002, Yang 2004, Napazakov 2008. A third of the prey items were shared by both species.…”

Section: Discussionsupporting

confidence: 82%

Food habits of Pacific cod and walleye pollock in the northern Gulf of Alaska

Urban¹

2012

Mar. Ecol. Prog. Ser.

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Seasonal variations in the diets of Pacific cod Gadus macrocephalus and walleye pollock Theragra chalcogramma were examined from fish collected during 5 sampling periods from August 1998 to June 1999 in the Kodiak Island area in the Gulf of Alaska. Both species were shown to be generalist predators, eating a wide variety of fish and invertebrates. Pollock, which are limited to pelagic prey, can be considered more specialized than cod. Cod consumed 78 prey items, and pollock consumed 45 prey items, with 28 items shared by both species. Individual pollock, however, typically concentrated on a single prey item, while individual cod stomachs contained a wider variety of prey. The principal prey of Pacific cod was Tanner crab Chionoecetes bairdi, comprising > 28% of the cod diet by weight. The most common prey item for walleye pollock was the euphausiid Thysanoessa. Over the 5 sampling periods, the prey evenness and niche width occupied by the 2 species were similar, but seasonal differences were evident.

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Section: Discussionsupporting

confidence: 82%

Food habits of Pacific cod and walleye pollock in the northern Gulf of Alaska

Urban¹

2012

Mar. Ecol. Prog. Ser.

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“…However, in the northeastern Bering Sea euphausiids are only the primary prey item for pollock <40 cm, while larger individuals feed on larvaceans and decapods (Dwyer et al, 1987). Off northern Japan there is interannual variation in the spring diet, with amphipods being the dominant prey item in some years and euphausiids in others (Kooka et al, 1998). Euphausiids are the dominant food item for 30-40 cm pollock off southern Japan, while individuals >40 cm prey on juvenile pollock (Yamamura et al, 2002).…”

Section: Diet Compositionmentioning

confidence: 99%

“…Additionally, the aforementioned studies all sampled pollock with bottom gear, and relatively little information is available on the diet of pelagic adults. Two studies that did sample with midwater gear found very different diets: in the western GOA the diet of adults consisted primarily of (non-pollock) fishes (Duffy-Anderson et al, 2003), whereas off northern Japan the diet of adults consisted primarily of amphipods and euphausiids (Kooka et al, 1998). No information is available on the diet of pelagic adults in the northern GOA.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal changes in the diet composition and prey selection of walleye pollock (Theragra chalcogramma) in the northern Gulf of Alaska

2007

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“…, Nishimura (1969) 2-5 C 200 m (permanent thermocline) 5 C 200 m . Gong and Zhang (1986) 생활사 기반 모델을 이용한 동해 명태(Gadus chalcogrammus)의 개체군 평가 김규한·손명호 1 ·현상윤* Kooka et al (1998) 4 10 150-250 m 400-500 m .…”

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A Life Stage-based Model for Assessing the Walleye Pollock Gadus chalcogrammus Population in the East Sea

Kim¹,

Sohn²,

Hyun³

2017

Korean Journal of Fisheries and Aquatic Sciences

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Since the late 1990s, walleye pollock Gadus chalcogrammus fisheries in Korean waters have been considered collapsed. Although many fisheries scientists suspect that the collapse might have been triggered by overexploitation of juvenile pollock or environmental changes, such conjectures have been neither tested nor investigated, partially because of limited data on the population. There has been no survey of the population, and the ages of fish in fishery catch have rarely been identified. Instead, fishery catch data from 1975-1997 included information about two life stages, 'juveniles and adults,' and data on catch-per-unit-effort (CPUE) during 1963-2007 and those on fish length and weight during 1965-2003 had been sporadically collected from commercial fisheries. To test hypotheses about the collapse of the pollock fisheries, we used a statistical linear model with juvenile CPUE as the response variable, and abiotic (e.g., water temperatures) and biotic factors [e.g., adult pollock, flatfishes (Pleuronectidae sp.), and sandfish (Arctoscopus japonicus) CPUEs] as the explanatory variables. The model results indicated that depletion of the pollock population was associated with both biotic (adult pollock and flatfishes abundance) and abiotic factors (mid-water temperatures in February and October). We further interpreted the results from ecological and biological perspectives, suggesting possible mechanisms.

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Vertical Distribution and Prey of Walleye Pollock in the Northern Japan Sea

Cited by 17 publications

References 11 publications

Food habits of Pacific cod and walleye pollock in the northern Gulf of Alaska

Food habits of Pacific cod and walleye pollock in the northern Gulf of Alaska

Seasonal changes in the diet composition and prey selection of walleye pollock (Theragra chalcogramma) in the northern Gulf of Alaska

A Life Stage-based Model for Assessing the Walleye Pollock Gadus chalcogrammus Population in the East Sea

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