Variation in behavioural responses of sub-tropical marine fishes to experimental longline capture

Talwar, Brendan S., Bouyoucos, Ian A., Brooks, Edward J., Brownscombe, Jacob W., Suski, Cory D., Cooke, Steven J., Grubbs, R. Dean, and Mandelman, John W. (2020) Variation in behavioural responses of sub-tropical marine fishes to experimental longline capture. ICES Journal of Marine Science, 77 (7-8). pp. 2763-2775.

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Fishes are often caught as bycatch on longlines and subsequently discarded. The behavioural response of fishes to longline capture is poorly understood, although it may be linked to the magnitude of the physiological stress response, and, ultimately, contribute to stress-induced mortality. We used accelerometers, video cameras, and hook timers to analyse the behavioural response of 13 subtropical teleost and elasmobranch species to experimental longline capture in The Bahamas. We found that, across all species and species groups, fight intensity during a capture event was best described by a negative linear and positive quadratic response. Nurse sharks and tiger sharks had lower fight intensity values and exhibited less steepness in their quadratic response during the first 10 min of capture than other species, particularly blacktip and Caribbean reef sharks. Nurse sharks also exhibited the most consistent fight intensity during the entire capture event compared to other shark species, particularly the blacknose shark. Generally, obligate ram ventilators and mixed ventilators exhibited higher steepness in fight intensity trajectories than buccal/spiracular pumpers, which had more consistent, lower fight intensity values. Behavioural responses to longline capture are species specific but may be linked to distinct evolutionary traits such as respiratory mode.

Item ID: 65080
Item Type: Article (Research - C1)
ISSN: 1095-9289
Keywords: accelerometer, bycatch, capture behaviour, fisheries capture, longline, shark, stress physiology, ventilation mode
Copyright Information: © International Council for the Exploration of the Sea 2020. All rights reserved.
Funders: Cape Eleuthera Foundation, New England Aquarium, Anderson Cabot Center for Ocean Life, Florida State University (FSU)
Date Deposited: 18 Nov 2020 01:58
FoR Codes: 31 BIOLOGICAL SCIENCES > 3109 Zoology > 310901 Animal behaviour @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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