Association of Walleye Pollock, Theragra chalcogramma, with the Jellyfish, Cyanea

Hyning, J. M. Van; Cooney, Ronan

doi:10.2307/1442701

Cited by 5 publications

(4 citation statements)

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“…On the other hand, some fish species may benefit from the increase in large medusae. The juvenile stages of some fish species ( Arai, 1988; Kingsford, 1993), including walleye pollock ( van Hyning and Cooney, 1974; Hamner, 1983; Brodeur, 1998), are found associated with medusae and may utilize them as shelter sites from intensive predation in the pelagic realm. It is too early to know how, if at all, the recent increase in large medusae will affect fish production in the Bering Sea, but continual monitoring and study of the ecology, including reproduction, feeding habits, and predators of this group is clearly warranted.…”

Section: Discussionmentioning

confidence: 99%

Evidence for a substantial increase in gelatinous zooplankton in the Bering Sea, with possible links to climate change

Brodeur

Mills

Overland

et al. 1999

Fisheries Oceanography

224

139

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We examined quantitative catches of large medusae from summer bottom trawl surveys that sampled virtually the same grid station on the eastern Bering Sea shelf using the same methodology every year from 1979 to 1997. This series shows a gradual increase in biomass of medusae from 1979 to 1989, followed by a dramatic increase in the 1990s. The median biomass increased tenfold between the 1982–1989 and 1990–1997 periods. Most of this biomass was found within the Middle Shelf Domain (50 < z < 100 m). The greatest rate of increase occurred in the north‐west portion of this domain. Whether this dramatic increase in biomass of gelatinous zooplankton has resulted from some anthropogenic perturbation of the Bering Sea environment or is a manifestation of natural ecosystem variability is unclear. However, several large‐scale winter/spring atmospheric and oceanographic variables in the Bering Sea exhibited concomitant changes beginning around 1990, indicating that a possible regime change occurred at this time.

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Section: Discussionmentioning

confidence: 99%

Evidence for a substantial increase in gelatinous zooplankton in the Bering Sea, with possible links to climate change

Brodeur

Mills

Overland

et al. 1999

Fisheries Oceanography

224

139

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“…Typically, Cnidaria are not themselves murre prey, although jellyfish do sometimes occur In murre diets (Harrison 1984). However, young stages of gadid fish are often associated with schyphozoans [Mansueti 1963, Van Hyning & Cooney 1974. During this investigation, juvenile pollock were caught in net tows (Evans 1992) and were also present in murre stomach samples (Table 2).…”

Section: Discussionmentioning

confidence: 99%

Foraging by murres (Uria spp.) at tidal fronts surrounding the Pribilof Islands, Alaska, USA

Decker¹,

Hunt²

1996

Mar. Ecol. Prog. Ser.

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We investigated the foraging distribution of 2 species of murres (Uria lomvia and U. aalge) in relation to Acoustically Determined Biomass (ADB) and hydrographic structure surrounding the Pribilof Islands, Bering Sea, Alaska, USA. The distribution and abundance of both murre species were similar; therefore, we combined data for thick-billed and common murres in the analysis. We found that murre densities were higher in frontal regions than in non-frontal regions. Maximum ADB was also found to be elevated in the frontal zone. Within frontal regions, high densities of rnurres were associated with regions containing relatively high levels of ADB. In contrast, we did not find significant correlations between murre density and ADB in the study area as a whole. We postulate that rnurres restrict their foraging to the frontal region because prey can be located more predictably within this zone than in other areas in the vicinity of the Pribilof Islands.

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“…Young pollock (17-24 mm SL) have been found swimming in close proximity to jellyfish in Prince William Sound (Van Hyning and Cooney, 1974); however, no evidence of symbiosis was observed. These authors suggest that the association is similar to that seen for juveniles of other fishes that are attracted to inanimate floating objects (see review by Kingsford, 1993).…”

Section: Species Associationsmentioning

confidence: 98%

A review of the distribution, ecology and population dynamics of age‐0 walleye pollock in the Gulf of Alaska

Brodeur

Wilson

1996

Fisheries Oceanography

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This review paper synthesizes published research and unpublished data on the abundance and distribution patterns, ecology and population dynamics of walleye pollock (Theragra chalcogramma) during their first year of life (age‐0) in the Gulf of Alaska. Distribution patterns have been described using mainly trawl catches, but recently, acoustic methodology has been employed, especially in examining vertical distributions. Although age‐0 pollock are found throughout the Gulf, the highest catches occurred west of Kodiak Island. Pollock are pelagic for at least their first 6 months of life but show an ontogenetic increase in depth distribution superimposed on a pronounced diel vertical migration at a larger size. Daily growth rates are variable depending on year, season and area, and growth generally ceases during the winter. The diet of age‐0 pollock shifts from mainly copepods in early juveniles to euphausiids by fall, with epibenthic organisms becoming important during the winter months. Feeding occurs mainly at night in surface waters. Age‐0 pollock are most frequently associated with gelatinous zooplankton (medusae) and older pollock. Many predators on age‐0 pollock have been identified; the most important are arrowtooth flounder (Atheresthes stomias), adult pollock, puffins (Fratercula spp.), murres (Una spp.), harbor seals (Phoca vitulina richardsi) and Steller sea lions (Eumetopiasjubatus). Modelling provides some insight into the population dynamics of these juveniles and environmental conditions which interannually affect their survival. These results are discussed relative to the importance of age‐0 pollock in the recruitment of this species and to their role in the pelagic ecosystem.

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Association of Walleye Pollock, Theragra chalcogramma, with the Jellyfish, Cyanea

Cited by 5 publications

References 0 publications

Evidence for a substantial increase in gelatinous zooplankton in the Bering Sea, with possible links to climate change

Evidence for a substantial increase in gelatinous zooplankton in the Bering Sea, with possible links to climate change

Foraging by murres (Uria spp.) at tidal fronts surrounding the Pribilof Islands, Alaska, USA

A review of the distribution, ecology and population dynamics of age‐0 walleye pollock in the Gulf of Alaska

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