EFFECT OF LOBSTER SIZE VARIATION ON CATCHES ON THE CONTINENTAL SHELF OFF CEARÁ, BRAZIL

Autores/as

  • Soraya da Silva Neves Universidade Federal do Ceará, Departamento de Engenharia de Pesca
  • Juliana de Carvalho Gaeta Universidade Federal do Ceará, Instituto de Ciências do Mar
  • João Vicente Mendes Santana Instituto Federal de Educação, Ciências e Tecnologia do Ceará (IFCE) - Campus Acaraú.
  • Soniamar Zschornack Rodrigues Saraiva Instituto Federal de Educação, Ciências e Tecnologia do Ceará (IFCE) - Campus Acaraú
  • Raúl Cruz Universidade Federal do Ceará, Instituto de Ciências do Mar

DOI:

https://doi.org/10.32360/acmar.v48i2.5848

Palabras clave:

Panulirus, minimum legal size, fishing mortality, biomass

Resumen

In this study we evaluate to what extent variation in length class composition of P. argus at two depth ranges (1- 10 m and 30-50 m) is reflected in the overall biomass and how this affects the management of spiny lobster resources onthe continental shelf off Ceará. Lobster catches consisted mainly of large juveniles (42-50 mm CL) and pre-recruits (50-73 mm CL) in shallow waters, and of adults (80-109 mm CL) at intermediate depth (30-50 m). Based on selectivity curves,the size at first capture (L50) in shallow waters was 12% smaller than the minimum legal size (MLS). A 13% or a 21% increase would be required to reach the current MLS (75 mm CL) or the ideal MLS (80 mm CL), respectively. In contrast, at intermediate depth L 50 was greater than the MLS. Pre-recruits (50-73 mm CL) comprised 86% of catches (98% of the mean biomass) in shallow waters and 26.1% (55% of the mean biomass) at intermediate depth. If the L 50 for shallow waters were raised to the current MLS or the ideal MLS, the biomass would increase by 79 and 84%, respectively.

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Publicado

2015-12-01

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