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<p>The spotback skate (<i>Atlantoraja castelnaui</i>) is a large species (≈1400&#xa0;mm total length) subjected to intense fishing pressure in a multispecies fishery off Uruguay and northern Argentina (34º–41ºS). Despite this, species-specific landing reports and stock assessments are lacking. Demographic analyses may offer a comprehensive characterization of the population to examine potential responses to management actions. Here, we used a static age-structured Leslie matrix model to perform demographic analyses on <i>A. castelnaui</i>, with parameter uncertainty incorporated through Monte Carlo simulations. Without exploitation, the finite rate of population growth (<i>λ</i>) was 1.065&#xa0;years<sup>−1</sup>, the net reproductive rate (<i>R</i><sub>0</sub>) was 18.032 and generation time (<i>G</i>) was 23.833&#xa0;years. Elasticity analyses indicated that juvenile survival had greater effects on population growth rates than adult survival or fecundity. Using this model, we explored two management options: (1) fishing mortality applied to all age classes (current situation), and (2) fishing restricted to adults, excluding juveniles. Results indicate that sustainable fishing levels are reached when fishing mortality begins to be applied after sexual maturity. Urgent species-specific management measures for <i>A. castelanui</i> are needed, where a reduction in juvenile fishing mortality is the most likely measure to effectively mitigate population depletion.</p>

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Fishery management options for the critically endangered spotback skate, Atlantoraja castelnaui: the only privileged ones should be the juveniles

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Santiago A. Barbini,
  • Jorge M. Roman,
  • Santiago J. Bianchi,
  • Luis O. Lucifora

摘要

The spotback skate (Atlantoraja castelnaui) is a large species (≈1400 mm total length) subjected to intense fishing pressure in a multispecies fishery off Uruguay and northern Argentina (34º–41ºS). Despite this, species-specific landing reports and stock assessments are lacking. Demographic analyses may offer a comprehensive characterization of the population to examine potential responses to management actions. Here, we used a static age-structured Leslie matrix model to perform demographic analyses on A. castelnaui, with parameter uncertainty incorporated through Monte Carlo simulations. Without exploitation, the finite rate of population growth (λ) was 1.065 years−1, the net reproductive rate (R0) was 18.032 and generation time (G) was 23.833 years. Elasticity analyses indicated that juvenile survival had greater effects on population growth rates than adult survival or fecundity. Using this model, we explored two management options: (1) fishing mortality applied to all age classes (current situation), and (2) fishing restricted to adults, excluding juveniles. Results indicate that sustainable fishing levels are reached when fishing mortality begins to be applied after sexual maturity. Urgent species-specific management measures for A. castelanui are needed, where a reduction in juvenile fishing mortality is the most likely measure to effectively mitigate population depletion.