The influence of hunger and predation risk on group cohesion in a pelagic fish, walleye pollock Theragra chalcogramma

  title={The influence of hunger and predation risk on group cohesion in a pelagic fish, walleye pollock Theragra chalcogramma},
  author={Susan M. Sogard and Bori L. Olla},
  journal={Environmental Biology of Fishes},
Variation in the intensity of schooling behavior in fishes suggests that the benefits of aggregation are balanced by certain costs. We examined the proximity of group members to each other in juvenile walleye pollock, Theragra chalcogramma, under different environmental conditions. Food availability, simulated by a gradient of six ration treatments, had a major influence on group cohesion, with increasing dispersion as food level decreased. Group cohesion also decreased at night relative to… CONTINUE READING
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