REPORT OF INJURIES IN BATOIDS CAUGHT IN SMALL-SCALE FISHERIES: IMPLICATIONS FOR MANAGEMENT PLANS

Authors

  • Alexandre Fernandes Soares Rodrigues Universidade Estadual Paulista http://orcid.org/0000-0002-1953-1261
  • Bianca de Sousa Rangel Universidade de São Pailo
  • Natascha Wosnick Universidade Federal do Maranhão
  • Hugo Bornatowski Universidade Federal do Paraná
  • Jorge Luís Santos Universidade Santa Cecília
  • Renata Guimarães Moreira Universidade de São Paulo
  • Alberto Ferreira de Amorim Universidade Estadual Paulista

DOI:

https://doi.org/10.4257/oeco.2019.2301.07

Keywords:

bycatch, conservation, elasmobranch, impacts of fishing, lesions

Abstract

Despite of the ecological importance of several batoids caught as bycatch, little attention is given to the individual resilience in risk assessments. The report of physical condition is imperative for a realistic understanding of the impacts caused by fishing, as a way to reduce the negative consequences of bycatch and improvement of management protocols. In this context, the present study provides an analysis of injuries observed in nine species of batoids caught by small scale fisheries by adopting a non-lethal approach. Levels of injury were determined according to severity and the relation between fishing time and injury/mortality was assessed. Results showed that injury levels and release condition were strongly influenced by fishing effort and time until release, with fishing effort lower than 110 min related with minor injuries, lower capture mortality rates (10.6%) and better release conditions. Since the frequency of batoids in small scale fisheries as accompanying fauna is high, the cooperation between researchers, fishermen and authorities is essential to reduce the negative consequences of bycatch. Based in the data presented here, we recommend that management plans establish fishing effort times and immediate release in areas of ecological importance for endangered species, thus helping to promote batoids conservation.

Author Biography

Alexandre Fernandes Soares Rodrigues, Universidade Estadual Paulista

Biólogo e pesquisador, aluno de doutorado em Zoologia pelo Instituto de Biociências da Universidade Júlio de Mesquita de Botucatu, atuando na pesquisa da estrutura populacional, genética e impactos pesqueiros pelo Laboratório de Biologia e Genética de Peixes (IBB-UNESP); Mestre em pesca e aquicultura pelo Instituto de Pesca -- APTA-SAA-SP, com foco nas capturas incidentais de raias pela pesca artesanal de arrasto camaroeiro e Licenciado em Ciências Biológicas pela Universidade Cruzeiro do Sul. Desde 2012 visa colaborar com a sensibilização e conservação dos elasmobrânquios, através da educação ambiental e pesquisa e divulgação científica, participando como educador de organizações não governamentais. Em 2014 iniciou pesquisas com foco conservacionista no levantamento de biodiversidade e efeitos da pesca artesanal em elasmobrânquios no Setor Guaíbe da APA Marinha Litoral Centro de São Paulo, sempre priorizando em seus trabalhos o emprego de metodologias não letais de pesquisa. Em 2016 tornou-se membro da Sociedade Brasileira para o Estudo de Elasmobrânquios (SBEEL) integrando a Comissão Estudantil da entidade.

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Published

2019-03-14

Issue

Vol. 23 No. 1 (2019): Spontaneous submissions

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Articles