Reproduction and spawning habitat of white trevally, Pseudocaranx dentex, in the Azores, central north Atlantic

Authors

  • Pedro Afonso IMAR / Department of Oceanography and Fisheries, University of the Azores
  • Jorge Fontes IMAR / Department of Oceanography and Fisheries, University of the Azores
  • Telmo Morato IMAR / Department of Oceanography and Fisheries, University of the Azores
  • Kim N. Holland Deparment of Zoology, Hawai’i Institute of Marine Biology, University of Hawai’i at Manoa
  • Ricardo S. Santos IMAR / Department of Oceanography and Fisheries, University of the Azores

DOI:

https://doi.org/10.3989/scimar.2008.72n2373

Keywords:

trevally, reproduction, spawning, habitat, offshore reefs, marine reserves

Abstract


Reproductive biology and habitat preferences of the white trevally, Pseudocaranx dentex (Carangidae), were studied in the Azores islands, central north Atlantic, to determine the spatial and seasonal dynamics of habitat use of immature and mature fish. The sex ratio was close to 1:1 and fish matured at about 30 cm fork length. There were no differences in the maturation or length-weight relationships between sexes. The spawning season lasts from June to September. Underwater visual censuses showed that schools of mature individuals preferentially aggregate around the summits of offshore reefs during the spawning season. In contrast, schools of smaller, immature fish use inshore habitats all year round. Our data support the hypothesis that offshore reefs are a preferential spawning habitat of larger white trevally, and most possibly for a number of visitor pelagic predators as well. Inverse relationships between exploitation levels, abundance and size composition at the two different islands suggest that the summer fishery targeting trevally schools around offshore reefs has negatively impacted the population. These findings bring additional ecological and management relevance to offshore reefs.

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Author Biography

Pedro Afonso, IMAR / Department of Oceanography and Fisheries, University of the Azores

Deparment of Zoology, Hawai’i Institute of Marine Biology, University of Hawai’i at Manoa, USA

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Published

2008-06-30

How to Cite

1.
Afonso P, Fontes J, Morato T, Holland KN, Santos RS. Reproduction and spawning habitat of white trevally, Pseudocaranx dentex, in the Azores, central north Atlantic. scimar [Internet]. 2008Jun.30 [cited 2020Nov.25];72(2):373-81. Available from: http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/854

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