Age, growth, and spawning season of red bream (Beryx decadactylus) off the southeastern United States
Red bream (Beryx decadactylus) is a commercially importantdeep-sea benthopelagic fish with a circumglobaldistribution on insular and continental slopes and seamounts. In the United States, small numbers arecaught incidentally in the wreckfish (Polyprion americanus) fishery which operates off the southeastern coast, but no biological information exists for the management of the U.S. red bream population. For this study, otoliths (n=163) and gonads (n=161) were collected from commercially caughtred bream between 2003 and 2008 to determine life history parameters. Specimens ranged in size from 410 to 630 mm fork length and were all determined to be mature by histological examination of the gonads. Females in spawning condition were observed from June through September, and reproductively active males were found year-round. Sectionedotoliths were difficult to interpret, but maximum age estimates were much higher than the 15 years previouslyreported for this species from the eastern North Atlantic based on whole-otolith analysis. Estimated ages ranged from 8 to 69 years, and a minimum lifespan of 49 years wasvalidated by using bomb radiocarbon dating. Natural mortality was estimated at 0.06/yr. This study showsthat red bream are longer lived and more vulnerable to overfishing than previously assumed and should bemanaged carefully to prevent overexploitation.
| Main Authors: | , |
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| Format: | article biblioteca |
| Language: | English |
| Published: |
2011
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| Subjects: | Biology, Ecology, Fisheries, |
| Online Access: | http://hdl.handle.net/1834/25371 |
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