Age, growth, and reproduction of dolphinfish (Coryphaena hippurus) caught off the coast of North Carolina

Schwenke, Kara L. and Buckel, Jeffrey A. (2008) Age, growth, and reproduction of dolphinfish (Coryphaena hippurus) caught off the coast of North Carolina. Fishery Bulletin, 106(1), pp. 82-92.

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Abstract

Age, growth, and reproductive data were obtained from dolphinfish (Coryphaena hippurus, size range: 89 to 1451 mm fork length [FL]) collected between May 2002 and May 2004 off North Carolina. Annual increments from scales (n=541) and daily increments from sagittal otoliths (n=107) were examined; estimated von Bertalanffy parameters were L∞ (asymptotic length)=1299 mm FL and k (growth coefficient)=1.08/yr. Daily growth increments reduced much of the residual error in length-at-age estimates for age-0 dolphinfish; the estimated average growth rate was 3.78 mm/day during the first six months. Size at 50% maturity was slightly smaller for female (460 mm FL) than male (475 mm FL) dolphinfish. Based on monthly length-adjusted gonad weights, peak spawning occurs from April through July off North Carolina; back-calculated hatching dates from age-0 dolphinfish and prior reproductive studies on the east coast of Florida indicate that dolphinfish spawning occurs year round off the U.S. east coast and highest levels range from January through June. No major changes in length-at-age or size-at-maturity have occurred since the early 1960s, even after substantial increases in fishery landings.

Item Type: Article
Title: Age, growth, and reproduction of dolphinfish (Coryphaena hippurus) caught off the coast of North Carolina
Personal Creator/Author:
CreatorsEmail
Schwenke, Kara L.
Buckel, Jeffrey A.
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 106
Number: 1
Page Range: pp. 82-92
Date: 2008
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Item ID: 8858
Depositing User: Patti M. Marraro
Date Deposited: 14 Jun 2012 17:12
Last Modified: 14 Jun 2012 17:12
URI: http://aquaticcommons.org/id/eprint/8858

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