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<p>The mangrove crab fishery (<i>Ucides occidentalis</i>) includes areas of sustainable use and custody (ASUC) which are granted to fishermen’s associations. Management involves seasonal closures and a total prohibition on fishing for female crabs, as well as setting a minimum legal size for male crabs (75&#xa0;mm carapace width-CW). Our aim was to establish a method for setting a total allowable catch (TAC) and an empirical harvest control rule (HCRe). The method is based on the population density of mangrove crab, therefore is fishery-independent and can be used as an empirical method and precautionary. We used the information on the Mondragón fishermen’s association, density and population size estimated in 2021, as well as reported crab landings for 2014–2020. We calculated the TAC by categorizing the male crabs as either non-commercial males (&lt; 75&#xa0;mm CW) or commercial (&gt; 75&#xa0;mm CW). Two equations were applied for setting the TAC, using <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:{\text{H}\text{C}\text{R}}_{\text{e}}\:\)</EquationSource> </InlineEquation>values of 0.3–0.7. The results were TAC1 = 72 945 − 170 205 and TAC2 = 72 311 − 168 725. The annual removal potential of male crabs from the population was between 10 and 23%. Considering the TAC1 values, these were lower than crab landings in all years except 2018 and 2020. TAC represents a fishery management alternative with results that are useful for decision-makers for sustainable management at the local and regional levels.</p>

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Total Allowable Catch Based on Population Size for the Mangrove Crab Fishery in Ecuador

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • René Zambrano,
  • Dialhy Coello

摘要

The mangrove crab fishery (Ucides occidentalis) includes areas of sustainable use and custody (ASUC) which are granted to fishermen’s associations. Management involves seasonal closures and a total prohibition on fishing for female crabs, as well as setting a minimum legal size for male crabs (75 mm carapace width-CW). Our aim was to establish a method for setting a total allowable catch (TAC) and an empirical harvest control rule (HCRe). The method is based on the population density of mangrove crab, therefore is fishery-independent and can be used as an empirical method and precautionary. We used the information on the Mondragón fishermen’s association, density and population size estimated in 2021, as well as reported crab landings for 2014–2020. We calculated the TAC by categorizing the male crabs as either non-commercial males (< 75 mm CW) or commercial (> 75 mm CW). Two equations were applied for setting the TAC, using \(\:{\text{H}\text{C}\text{R}}_{\text{e}}\:\) values of 0.3–0.7. The results were TAC1 = 72 945 − 170 205 and TAC2 = 72 311 − 168 725. The annual removal potential of male crabs from the population was between 10 and 23%. Considering the TAC1 values, these were lower than crab landings in all years except 2018 and 2020. TAC represents a fishery management alternative with results that are useful for decision-makers for sustainable management at the local and regional levels.