Dolphinfish (Coryphaena hippurus) distribution in relation to biophysical ocean conditions in the northwest Atlantic
We analyzed temporal and spatial catch per unit effort (CPUE) of dolphinfish (Coryphaena hippurus) along the U.S. east coast using pelagic longline logbook data (1999-2007). A zero-inflated negative binomial model was fit using a variety of oceanographic variables to better understand distribution and abundance. The two most important dynamic oceanographic variables were sea surface temperature and chlorophyll-a concentration. We also used catch and release locations of dolphinfish caught by recreational fishermen (2002-2007) to compare conditions between datasets and for model evaluation. Dolphinfish CPUE was highest at 22-25°C with a peak at 24°C for the longline dataset, while recreational dolphinfish were caught in waters >19°C with peak catches occurring at 27°C. Dolphinfish CPUE was highest when chlorophyll-a concentration was <0.2mgm-3, and the majority of recreational dolphinfish were captured in waters <0.1mgm-3 with a peak at 0.02mgm-3. We also found that a majority (73.26%) of recreational dolphinfish were caught in association with Sargassum spp., and larger dolphinfish (>82.3cm FL) are caught more frequently outside of the floating mats. © 2014 The Authors.
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- Fisheries
- 4104 Environmental management
- 3103 Ecology
- 3005 Fisheries sciences
- 0704 Fisheries Sciences
- 0602 Ecology
- 0502 Environmental Science and Management
Citation
Published In
DOI
ISSN
Publication Date
Volume
Start / End Page
Related Subject Headings
- Fisheries
- 4104 Environmental management
- 3103 Ecology
- 3005 Fisheries sciences
- 0704 Fisheries Sciences
- 0602 Ecology
- 0502 Environmental Science and Management