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<p>Overfishing and by-catch (the unintentional capture of non-target species or sizes) represent two of the greatest threats to marine populations. Modelling and predicting the trends of species captured during fishing could provide a tool with which to prioritise species and conservation actions. These aims are especially important in the case of sharks, since these species are targeted by the global shark fin trade and also unintentionally caught as by-catch by many fisheries. In this study we describe the by-catch of sharks in the traditional continental Ecuadorian fishery, with the specific aims to: (1) evaluate the temporal changes in the catch of the most common shark species from 2008 to 2018 in Ecuadorian coastal waters and (2) determine the changes in the total catch and size composition of these species. Shark by-catch in the Eastern Pacific Ocean (EPO) was evaluated by observers from longline fisheries, whose target catch comprises large pelagic fish (albacore, marlins or mahi mahi). In this context, sharks are true by-catches, as they are unintentionally captured and not targeted by the longline fisheries. We evaluated the six most frequently fished species of sharks in the EPO (<i>Prionace glauca, Alopias pelagicus, Alopias superciliosus, Sphyrna zygaena, Carcharhinus falciformes</i> and <i>Isurus oxirynchus</i>), including the sizes and quantify of catch by number. The average size (± standard deviation) of these species was 209.3 ± 8.5, 274.6 ± 13.6, 296.2 ± 7.9, 197.2 ± 26.8, 184.2 ± 8.3 and 168.3 ± 11.1&#xa0;cm, respectively. The results show a decline in the size of the captured shark species across years, which is particularly dramatic in the case of vulnerable species such as <i>S. zygaena.</i> A shift in fishing activity toward the Central-Eastern Tropical Pacific Ocean was also observed. The status of these six shark species should be considered in the design of future management measures in the area, including the protected sanctuary of Galapagos, where most of the recent catches are concentrated.</p>

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Temporal assessment of shark incidental catch in the Eastern Pacific Ocean

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Erklin Quintero,
  • Antonio J. Carpio,
  • Francisco S. Tortosa,
  • Jose Oteros

摘要

Overfishing and by-catch (the unintentional capture of non-target species or sizes) represent two of the greatest threats to marine populations. Modelling and predicting the trends of species captured during fishing could provide a tool with which to prioritise species and conservation actions. These aims are especially important in the case of sharks, since these species are targeted by the global shark fin trade and also unintentionally caught as by-catch by many fisheries. In this study we describe the by-catch of sharks in the traditional continental Ecuadorian fishery, with the specific aims to: (1) evaluate the temporal changes in the catch of the most common shark species from 2008 to 2018 in Ecuadorian coastal waters and (2) determine the changes in the total catch and size composition of these species. Shark by-catch in the Eastern Pacific Ocean (EPO) was evaluated by observers from longline fisheries, whose target catch comprises large pelagic fish (albacore, marlins or mahi mahi). In this context, sharks are true by-catches, as they are unintentionally captured and not targeted by the longline fisheries. We evaluated the six most frequently fished species of sharks in the EPO (Prionace glauca, Alopias pelagicus, Alopias superciliosus, Sphyrna zygaena, Carcharhinus falciformes and Isurus oxirynchus), including the sizes and quantify of catch by number. The average size (± standard deviation) of these species was 209.3 ± 8.5, 274.6 ± 13.6, 296.2 ± 7.9, 197.2 ± 26.8, 184.2 ± 8.3 and 168.3 ± 11.1 cm, respectively. The results show a decline in the size of the captured shark species across years, which is particularly dramatic in the case of vulnerable species such as S. zygaena. A shift in fishing activity toward the Central-Eastern Tropical Pacific Ocean was also observed. The status of these six shark species should be considered in the design of future management measures in the area, including the protected sanctuary of Galapagos, where most of the recent catches are concentrated.