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Marine Ecology Progress Series

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MEPS 660:153-159 (2021)  -  DOI:

Preliminary estimate of post-release survival of immature porbeagles caught with rod-and-reel in the Northwest Atlantic Ocean

Brooke N. Anderson1,2,*, Heather D. Bowlby3, Lisa J. Natanson4, Rui Coelho5,6, Enric Cortés7, Andrés Domingo8, James A. Sulikowski2

1Marine Science Department, University of New England, Biddeford, ME 04005, USA
2School of Mathematical and Natural Sciences, Arizona State University-West, Glendale, AZ 85306, USA
3Fisheries and Oceans Canada Maritimes Region, Dartmouth, NS B2Y 4A2, Canada
4National Marine Fisheries Service, Northeast Fisheries Science Center, Narragansett Laboratory, Narragansett, RI 02882, USA
5Portuguese Institute for the Ocean and Atmosphere (IPMA, I.P.), 8700-305 Olhão, Portugal
6Centre of Marine Sciences (CCMAR), University of the Algarve, 8005-139 Faro, Portugal
7National Marine Fisheries Service, Southeast Fisheries Science Center, Panama City Laboratory, Panama City, FL 32408, USA
8Dirección Nacional de Recursos Acuáticos, Laboratorio de Recursos Pelágicos, 11200 Montevideo, Uruguay
*Corresponding author:

ABSTRACT: The Northwest Atlantic (NWA) population of porbeagles Lamna nasus is susceptible to capture in rod-and-reel fisheries and most individuals are discarded alive due to catch and size limits. To estimate post-release survival, pop-off satellite archival tags were attached to porbeagles captured with rod-and-reel. Fourteen tags were deployed, of which 13 transmitted. All sharks for which we had data survived, giving a post-release survival rate of 100%. Following release, 6 individuals remained in surface waters for several hours to days, while 2 individuals immediately resumed normal diving behaviors. For the remaining sharks (n = 5), low tag transmission resolution precluded the detection of fine scale post-release behavior. The duration of initial depth-holding behavior was characterized using a break-point analysis of dive track variance, which suggests porbeagles exhibited a median post-release recovery period of 116 h (10th and 90th percentiles = 68.8 and 280.1 h) following capture and handling. Our preliminary study suggests immature porbeagles are resilient to capture and handling, although more data would provide stronger support for management recommendations.

KEY WORDS: Porbeagle · Survival · Shark

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Cite this article as: Anderson BN, Bowlby HD, Natanson LJ, Coelho R, Cortés E, Domingo A, Sulikowski JA (2021) Preliminary estimate of post-release survival of immature porbeagles caught with rod-and-reel in the Northwest Atlantic Ocean. Mar Ecol Prog Ser 660:153-159.

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