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Tuna and swordfish catch in the U.S. northwest Atlantic longline fishery in relation to mesoscale eddies.

Publication ,  Journal Article
Hsu, AC; Boustany, AM; Roberts, JJ; Chang, J-H; Halpin, PN
Published in: Fisheries oceanography
November 2015

To analyze the effects of mesoscale eddies, sea surface temperature (SST), and gear configuration on the catch of Atlantic bluefin (Thunnus thynnus), yellowfin (Thunnus albacares), and bigeye tuna (Thunnus obesus) and swordfish (Xiphias gladius) in the U.S. northwest Atlantic longline fishery, we constructed multivariate statistical models relating these variables to the catch of the four species in 62 121 longline hauls made between 1993 and 2005. During the same 13-year period, 103 anticyclonic eddies and 269 cyclonic eddies were detected by our algorithm in the region 30-55°N, 30-80°W. Our results show that tuna and swordfish catches were associated with different eddy structures. Bluefin tuna catch was highest in anticyclonic eddies whereas yellowfin and bigeye tuna catches were highest in cyclonic eddies. Swordfish catch was found preferentially in regions outside of eddies. Our study confirms that the common practice of targeting tuna with day sets and swordfish with night sets is effective. In addition, bluefin tuna and swordfish catches responded to most of the variables we tested in the opposite directions. Bluefin tuna catch was negatively correlated with longitude and the number of light sticks used whereas swordfish catch was positively correlated with these two variables. We argue that overfishing of bluefin tuna can be alleviated and that swordfish can be targeted more efficiently by avoiding fishing in anticyclonic eddies and in near-shore waters and using more light sticks and fishing at night in our study area, although further studies are needed to propose a solid oceanography-based management plan for catch selection.

Duke Scholars

Published In

Fisheries oceanography

DOI

EISSN

1365-2419

ISSN

1054-6006

Publication Date

November 2015

Volume

24

Issue

6

Start / End Page

508 / 520

Related Subject Headings

  • Fisheries
  • 3708 Oceanography
  • 3005 Fisheries sciences
  • 0704 Fisheries Sciences
  • 0405 Oceanography
 

Citation

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MLA
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Hsu, A. C., Boustany, A. M., Roberts, J. J., Chang, J.-H., & Halpin, P. N. (2015). Tuna and swordfish catch in the U.S. northwest Atlantic longline fishery in relation to mesoscale eddies. Fisheries Oceanography, 24(6), 508–520. https://doi.org/10.1111/fog.12125
Hsu, Ango C., Andre M. Boustany, Jason J. Roberts, Jui-Han Chang, and Patrick N. Halpin. “Tuna and swordfish catch in the U.S. northwest Atlantic longline fishery in relation to mesoscale eddies.Fisheries Oceanography 24, no. 6 (November 2015): 508–20. https://doi.org/10.1111/fog.12125.
Hsu AC, Boustany AM, Roberts JJ, Chang J-H, Halpin PN. Tuna and swordfish catch in the U.S. northwest Atlantic longline fishery in relation to mesoscale eddies. Fisheries oceanography. 2015 Nov;24(6):508–20.
Hsu, Ango C., et al. “Tuna and swordfish catch in the U.S. northwest Atlantic longline fishery in relation to mesoscale eddies.Fisheries Oceanography, vol. 24, no. 6, Nov. 2015, pp. 508–20. Epmc, doi:10.1111/fog.12125.
Hsu AC, Boustany AM, Roberts JJ, Chang J-H, Halpin PN. Tuna and swordfish catch in the U.S. northwest Atlantic longline fishery in relation to mesoscale eddies. Fisheries oceanography. 2015 Nov;24(6):508–520.
Journal cover image

Published In

Fisheries oceanography

DOI

EISSN

1365-2419

ISSN

1054-6006

Publication Date

November 2015

Volume

24

Issue

6

Start / End Page

508 / 520

Related Subject Headings

  • Fisheries
  • 3708 Oceanography
  • 3005 Fisheries sciences
  • 0704 Fisheries Sciences
  • 0405 Oceanography