Winter variability in the diets of groundfish inhabiting a subarctic sound with a focus on Pacific herring and walleye pollock piscivory

Gray, Benjamin P.; Bishop, Mary Anne; Powers, Sean P.

doi:10.1016/j.dsr2.2021.104984

Cited by 1 publication

(1 citation statement)

References 78 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pacific cod (Gadus macrocephalus) is an important fishery resource with high ecological and economic value in marine ecosystems (Ueba et al 2004;Savin 2007;Fissel et al 2017). They are widely distributed throughout the North Pacific and feed on various fishes and invertebrates, particularly walleye pollock (Gadus chalcogrammus), Pacific herring (Clupea pallasii), shrimps, and crabs (Albers and Anderson 1985;Yamamura et al 1993;Yang 2004;Poltev and Stominok 2008;Urban 2012;Gray et al 2021). In turn, Pacific cod are consumed by upper-level predators, such as Steller sea lions (Eumetopias jubatus (Goto et al 2017)) and beluga whales (Delphinapterus leucas (Quakenbush et al 2015)).…”

Section: Introductionmentioning

confidence: 99%

Summer diet and feeding strategy of Pacific cod (Gadus macrocephalus) inhabiting the southern coast of Hokkaido, Japan

Wang

Chimura

Sadayasu

et al. 2022

Marine Biology Research

View full text Add to dashboard Cite

The ontogenetic and interannual variations in the diet and feeding strategy of Pacific cod (Gadus macrocephalus) were examined based on 1,302 specimens collected by a trawling net off the southern coast of Hokkaido from late June to early July during 2016-2020. The diet comprised 63 species (13 taxa). Fish was the most important prey, followed by decapod crustaceans. In 2016, walleye pollock (Gadus chalcogrammus) was the dominant fish prey species, while amphipods, decapods, and Japanese lanternfish (Notoscopelus japonicus) were prominent in the diet in 2017.Japanese sardine (Sardinops melanostictus) were more predominant during 2018-2020. An ontogenetic comparison of diet indicated that smaller individuals (£ 400 mm standard length, SL) preyed mainly on small prey items, such as decapod crustaceans and polychaetes, whereas larger individuals (> 400 mm SL) preyed mainly on fish. Moreover, prey size exhibited a significant increasing trend with predator body length. These results suggest that Pacific cod has a flexible feeding strategy that differs by life stage. The updated information on predator-prey relationships provided herein improves our understanding of energy flow in the marine ecosystem and could facilitate ecosystem-based fishery management strategies.

show abstract