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Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
RESEARCH ARTICLE

First insights into the vertical habitat use of young porbeagles in the north-western Atlantic with implications for bycatch reduction strategies

Brooke N. Anderson https://orcid.org/0000-0003-4299-3496 A F * , Heather D. Bowlby B , Steven Saul C , Yun Kang C , Neil Hammerschlag D G , Lisa J. Natanson E and James A. Sulikowski A H
+ Author Affiliations
- Author Affiliations

A School of Mathematical and Natural Sciences, Arizona State University, Glendale, AZ 85306, USA.

B Fisheries and Oceans Canada Maritimes Region, Dartmouth, NS, B2Y 4A2, Canada.

C College of Integrative Sciences and Arts, Arizona State University, Mesa, AZ 85212, USA.

D Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL 33149, USA.

E Retired. Formerly at National Marine Fisheries Service, Northeast Fisheries Science Center, Narragansett Laboratory, Narragansett, RI 02882, USA.

F Present address: School of Life Sciences, Arizona State University, Tempe, AZ 85281, USA.

G Present address: Atlantic Shark Expeditions Ltd, Boutiliers Point, NS, B3Z 0M9, Canada.

H Present address: Hatfield Marine Science Center, Oregon State University, Newport, OR 97365, USA.

* Correspondence to: bnanderso@gmail.com

Handling Editor: Colin Simpfendorfer

Marine and Freshwater Research 75, MF23182 https://doi.org/10.1071/MF23182
Submitted: 19 September 2023  Accepted: 26 July 2024  Published: 20 August 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context

For threatened marine species, data on their vertical habitat use patterns can reveal risk of interactions with fishing gear and can inform bycatch avoidance strategies. Such data are lacking for young porbeagles (Lamna nasus), which are captured as bycatch in north-western Atlantic fisheries.

Aims

We aimed to examine temporal patterns in diving and characterise vertical habitat use of young porbeagles during summer and autumn.

Methods

We used data from short-term (28-day), high-resolution (5-min interval) pop-off satellite tags attached to 14 young (young-of-the-year and 1-year-old) porbeagles to model depth use.

Key results

Occupied depths ranged from the sea surface to 679 m, with ambient water temperatures of −0.2 to 26°C. Diel period and season were factors related to depth use.

Conclusions

Sharks exhibited a diel activity pattern characterised by more extensive use of the water column during the day while remaining primarily at the surface at night. Depth use differed between seasons, with summer characterised by greater affinity for surface waters (0–10 m) compared to autumn.

Implications

Young porbeagles are at risk of interaction with active fisheries on the continental shelf, but interactions may be reduced by setting gear deeper at night or during summer.

Keywords: bycatch mitigation, diel migration, elasmobranch, fisheries, Lamna nasus, satellite tagging, shark conservation, wavelet analysis.

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