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Evaluation of impact of artificial reefs on artisanal fisheries: need for complementary approaches

Abstracts

In a general context of fisheries decline due to overfishing and to other phenomena such as climate change, it appears to be crucial to implement a sustainable management of natural resources by finding a balance between conservation and exploitation purposes. Artificial reefs (ARs) have recently become one of the existing management tools, often in combination with fishing quotas or marine protected areas. To evaluate the effectiveness of the studied ARs, different methods have been used: (i) visual census by SCUBA diving (AR scale), (ii) fisheries landings survey (local scale) and (iii) external fish tagging (regional scale). Underwater visual census (UVC) showed a significantly higher species richness and density in ARs than in the control site. Abundance, biomass and LPUE data (Landings Per Unit Effort) issued from artisanal fisheries landings survey were not significantly different around the AR system from other fishing grounds of the French Catalan coast. The tagging experiments on Diplodus sargus suggested that the connectivity of demersal fish populations must be taken into account to evaluate the influence area of ARs and thus their indirect impacts on artisanal fisheries. The present study highlights the interest of combining methods covering different spatial scales in order to evaluate direct and indirect impacts of ARs on artisanal fisheries. Methods for the evaluation of AR efficiency are discussed.

Artificial reef; Artisanal fisheries; SCUBA visual census; Landings survey; Visual tagging


Dentro do atual contexto de redução nos estoques de peixes ligados à sobrepesca, e também à outros fenômenos tais como as mudanças climáticas, é indispensável implementar um plano de gestão durável para os recursos pesqueiros, conciliando sua exploração e conservação. Os recifes artificiais (RAs) tem surgido nos dias atuais como uma importante ferramenta de gestão, freqüentemente combinada à cotas de pesca ou áreas marinhas protegidas. Com a finalidade de avaliar a eficiência dos recifes artificiais, utilizou-se os seguintes métodos: i) censo visual direto através de mergulho autônomo com escafandro (na escala dos recifes artificiais); ii) monitoramento dos desembarques da pesca artesanal (na escala espacial local); e iii) marcações externas (em escala regional). As contagens realizadas através de mergulho mostraram que densidade e riqueza são significativamente mais elevadas nos recifes artificiais do que na área controle. A abundância, biomassa e os DPUE (Desembarques por unidade de esforço) provenientes do monitoramento dos desembarques da pesca artesanal, não foram significativamente diferentes entre as zonas de pesca do entorno dos recifes artificiais e as outras zonas de pesca da costa catalã francesa. Os resultados dos experimentos de marcação do sargo, Diplodus sargus, sugerem que a conectividade das populações de peixes demersais devem ser consideradas para avaliação das zonas de influência dos recifes artificiais e de seus impactos indiretos sobre a pesca artesanal. O presente estudo evidencia a oportunidade em combinar métodos que cubram diferentes escalas espaciais, a fim de avaliar os impactos diretos e indiretos dos RAs sobre a pesca artesanal. Os métodos para avaliar a eficiência dos recifes artificiais são também discutidos.

Recifes artificiais; Pesca artesanal; Censo visual por mergulho autônomo; Monitoramento de desembarques; Marcação visual


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Publication Dates

  • Publication in this collection
    11 Oct 2011
  • Date of issue
    2011

History

  • Received
    02 Feb 2010
  • Accepted
    15 Mar 2011
  • Reviewed
    26 Feb 2011
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