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Development of New Methods for Quantifying Fish Density Using Underwater Stereo-video Tools
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Benchmarking global fisheries discards.

E Gilman1, A Perez Roda2, T Huntington3

  • 1Pelagic Ecosystems Research Group, Honolulu, USA. EGilman@utas.edu.au.

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|August 22, 2020
PubMed
Summary
This summary is machine-generated.

Fisheries discard 9.1 million tonnes annually, a 10.8% global catch rate. This significant reduction in marine waste is encouraging, but trawl fisheries require focused efforts to further decrease discards.

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Area of Science:

  • Marine biology
  • Fisheries science
  • Environmental science

Background:

  • Fisheries discards represent a substantial source of marine waste, yet global estimates of their scale are limited.
  • Accurate discard data are crucial for effective and sustainable fisheries management worldwide.

Purpose of the Study:

  • To estimate the global discard rate and magnitude in marine and estuarine capture fisheries.
  • To identify fisheries and gear types with the highest discard rates requiring targeted reduction efforts.

Main Methods:

  • Utilized United Nations Food and Agriculture Organization (FAO) databases on country-specific landings.
  • Estimated fishery-specific discard rates from direct observations.
  • Applied a Bayesian modeling framework to estimate global gear-specific discard rates.

Main Results:

  • An estimated 9.1 million tonnes of fish are discarded annually, representing 10.8% of the global catch.
  • The global discard rate has decreased by approximately 50% since the late 1980s.
  • Demersal otter trawl fisheries exhibit particularly high discard rates, necessitating focused interventions.

Conclusions:

  • Global fisheries discards have significantly declined but remain a substantial environmental concern.
  • Trawl fisheries, especially demersal otter trawls, require intensified efforts to reduce discards.
  • Regular global discard benchmarks are essential for monitoring the effectiveness of management strategies.