Best practices for catch-and-release shark angling: current scientific understanding and future research

Horton, Thomas W; Exeter, Owen M.; Garzon, Francesco; Gordon, Cat; Hawkes, Lucy A.; Hood, Ali R.; Righton, David; Silva, Joana F.; Witt, Matthew J.

doi:10.1016/j.fishres.2023.106760

Fisheries Research

2023

DOI: 10.1016/j.fishres.2023.106760

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Best practices for catch-and-release shark angling: current scientific understanding and future research

Thomas W Horton

Owen M. Exeter

Francesco Garzon

et al.

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2024

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Cited by 2 publications

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Physiological responses to capture, handling and tagging in the critically endangered flapper skate (Dipturus intermedius)

Cole,

Lavender,

Naylor

et al. 2024

Conservation Physiology

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Catch-and-release angling is a popular recreational pastime and an essential component of many fish research programmes. Marked physiological disturbances have been documented in elasmobranchs in response to angling and handling, but skates and rays remain understudied. Here, we describe for the first time the physiological responses of the critically endangered flapper skate (Dipturus intermedius) to angling, handling and tagging in Scotland. Sixty-one skate were captured by angling as part of a tagging research programme. We assessed individual health, measured blood parameters at two time points (post-capture and prior to release) and recorded heart and respiratory rates during handling and the surgical insertion of acoustic tags. Injuries or infections were identified in 10% of individuals and attributed to prior angling in two cases. Skate generally experienced a mild metabolic acidosis characterized by decreases in blood pH and bicarbonate and increases in lactate and glucose. Respiratory acidosis characterized by limited increases in PCO2 was also observed. The degree of acidosis was greater with warmer sea temperatures and longer fight times, and worsened during the time that skate were handled on deck. Heart rates during handling were negatively associated with body size, positively associated with temperature and also linked to time on the line. Taken together, our results suggest that elevated fight times and temperatures increase the physiological stress experienced by rod and reel-caught flapper skate. Efforts to reduce fight times and minimize heat exposure (including shading, irrigation and reduced handling time) should be beneficial for skate.

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Physiological responses to capture, handling and tagging in the critically endangered flapper skate (Dipturus intermedius)

Cole,

Lavender,

Naylor

et al. 2024

Conservation Physiology

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Physiological assessment of the effects of experimental capture and transport in Pacific spiny dogfish

Bouyoucos,

Weinrauch,

Eastham

et al. 2024

Can. J. Fish. Aquat. Sci.

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Sharks are collected from the wild as live specimens for display in aquariums and use in research. The methods by which live sharks are captured and transported can be associated with sub-lethal physiological outcomes or even mortality, which requires evaluation to determine optimal collection and transport methods for a given species. The present study evaluated the primary (i.e., endocrine) and secondary (i.e., biochemical) stress responses and mortality in Pacific spiny dogfish (Squalus suckleyi) following capture and subsequent transport between experimental rod-and-reel angling and longline fishing. Dogfish were resilient to transport following capture by either method, exhibiting no at-vessel mortality and 0.03% delayed mortality. Longline captured dogfish exhibited signs of primary (i.e., elevated corticosterone) and secondary (i.e., elevated plasma potassium, osmolality, glucose, and lactate; decreased blood pH) stress responses, whereas dogfish that experienced rod-and-reel capture and transport only exhibited a secondary stress response (i.e., elevated plasma potassium, osmolality, and lactate; decreased blood pH). Together, these data demonstrate that Pacific spiny dogfish are robust to capture and transport using experimental hook-and-line fishing techniques.

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Best practices for catch-and-release shark angling: current scientific understanding and future research

Cited by 2 publications

References 67 publications

Physiological responses to capture, handling and tagging in the critically endangered flapper skate (Dipturus intermedius)

Physiological responses to capture, handling and tagging in the critically endangered flapper skate (Dipturus intermedius)

Physiological assessment of the effects of experimental capture and transport in Pacific spiny dogfish

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