Scientia Marina, Vol 72, No 2 (2008)

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


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

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

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

Jorge Fontes
IMAR / Department of Oceanography and Fisheries, University of the Azores, Portugal

Telmo Morato
IMAR / Department of Oceanography and Fisheries, University of the Azores, Portugal

Kim N. Holland
Deparment of Zoology, Hawai’i Institute of Marine Biology, University of Hawai’i at Manoa, United States

Ricardo S. Santos
IMAR / Department of Oceanography and Fisheries, University of the Azores, Portugal

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.

Keywords


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

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