When does fishing forage species affect their predators?

Ray Hilborn, Ricardo O. Amoroso, Eugenia Bogazzi, Olaf Jensen, Ana M. Parma, Cody Szuwalski, Carl J. Walters

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

This paper explores the impact of fishing low trophic level “forage” species on higher trophic level marine predators including other fish, birds and marine mammals. We show that existing analyses using trophic models have generally ignored a number of important factors including (1) the high level of natural variability of forage fish, (2) the weak relationship between forage fish spawning stock size and recruitment and the role of environmental productivity regimes, (3) the size distribution of forage fish, their predators and subsequent size selective predation (4) the changes in spatial distribution of the forage fish as it influences the reproductive success of predators. We show that taking account of these factors generally tends to make the impact of fishing forage fish on their predators less than estimated from trophic models. We also explore the empirical relationship between forage fish abundance and predator abundance for a range of U.S. fisheries and show that there is little evidence for a strong connection between forage fish abundance and the rate of change in the abundance of their predators. We suggest that any evaluation of harvest policies for forage fish needs to include these issues, and that models tailored for individual species and ecosystems are needed to guide fisheries management policy.

Original languageEnglish (US)
Pages (from-to)211-221
Number of pages11
JournalFisheries Research
Volume191
DOIs
StatePublished - Jul 1 2017

Fingerprint

forage
fishing
predator
predators
fish
trophic level
marine mammal
marine mammals
fishery management
fisheries management
reproductive success
spawning
predation
fishery
fisheries
spatial distribution
bird
productivity
ecosystems
ecosystem

All Science Journal Classification (ASJC) codes

  • Aquatic Science

Keywords

  • Ecopath
  • Ecosystem based fishery management
  • Forage fish
  • Marine predators
  • Small pelagics

Cite this

Hilborn, R., Amoroso, R. O., Bogazzi, E., Jensen, O., Parma, A. M., Szuwalski, C., & Walters, C. J. (2017). When does fishing forage species affect their predators? Fisheries Research, 191, 211-221. https://doi.org/10.1016/j.fishres.2017.01.008
Hilborn, Ray ; Amoroso, Ricardo O. ; Bogazzi, Eugenia ; Jensen, Olaf ; Parma, Ana M. ; Szuwalski, Cody ; Walters, Carl J. / When does fishing forage species affect their predators?. In: Fisheries Research. 2017 ; Vol. 191. pp. 211-221.
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Hilborn, R, Amoroso, RO, Bogazzi, E, Jensen, O, Parma, AM, Szuwalski, C & Walters, CJ 2017, 'When does fishing forage species affect their predators?', Fisheries Research, vol. 191, pp. 211-221. https://doi.org/10.1016/j.fishres.2017.01.008

When does fishing forage species affect their predators? / Hilborn, Ray; Amoroso, Ricardo O.; Bogazzi, Eugenia; Jensen, Olaf; Parma, Ana M.; Szuwalski, Cody; Walters, Carl J.

In: Fisheries Research, Vol. 191, 01.07.2017, p. 211-221.

Research output: Contribution to journalArticle

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Hilborn R, Amoroso RO, Bogazzi E, Jensen O, Parma AM, Szuwalski C et al. When does fishing forage species affect their predators? Fisheries Research. 2017 Jul 1;191:211-221. https://doi.org/10.1016/j.fishres.2017.01.008