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<p>Giant trevally (<i>Caranx ignobilis</i>; GT) is an apex predator in tropical waters of the Indo-Pacific and a target species of catch-and-release recreational fisheries, and little is known about the impacts that capture and handling have on GT. We evaluated the injury, physiological status, and post-release behavior of 73 GT caught using spinning gear with top-water lures that had different hook configurations in Kiritimati, Republic of Kiribati. GT caught using lures with a single J-hook or single treble hook were most often hooked in the mouth, while those caught on lures with two hooks (regardless of hook type) were more often hooked in the body. Unhooking difficulty and physical injury were greater for GT simultaneously hooked in both the mouth and body, particularly with lures having double treble hooks. Duration of air exposure increased when GT were captured on lures with one or two treble hooks and for larger fish. There was no mortality of GT at the time of release. Impairment of reflexes, particularly the ability to maintain equilibrium and bursting response, increased with fight time and duration of air exposure. Physiological measurement suggests that glucose and lactate levels increased with fight time, but only glucose increased with air exposure duration. GT tracked with pop-off biologgers showed consistent behavioral patterns including a short period (~ 5&#xa0;min) of low activity. Collectively, these results provide the first quantitative evidence of how GT respond to catch-and-release when caught with conventional tackle and thus can be used to inform best practices and management strategies.</p>

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Hooking injury, physiological stress, and post-release activity patterns of giant trevally (Caranx ignobilis) captured using spinning gear in a catch-and-release recreational fishery

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Andy J. Danylchuk,
  • Luc LaRochelle,
  • Graham D. Raby,
  • Brian Bennett,
  • Steven J. Cooke,
  • Jacob W. Brownscombe

摘要

Giant trevally (Caranx ignobilis; GT) is an apex predator in tropical waters of the Indo-Pacific and a target species of catch-and-release recreational fisheries, and little is known about the impacts that capture and handling have on GT. We evaluated the injury, physiological status, and post-release behavior of 73 GT caught using spinning gear with top-water lures that had different hook configurations in Kiritimati, Republic of Kiribati. GT caught using lures with a single J-hook or single treble hook were most often hooked in the mouth, while those caught on lures with two hooks (regardless of hook type) were more often hooked in the body. Unhooking difficulty and physical injury were greater for GT simultaneously hooked in both the mouth and body, particularly with lures having double treble hooks. Duration of air exposure increased when GT were captured on lures with one or two treble hooks and for larger fish. There was no mortality of GT at the time of release. Impairment of reflexes, particularly the ability to maintain equilibrium and bursting response, increased with fight time and duration of air exposure. Physiological measurement suggests that glucose and lactate levels increased with fight time, but only glucose increased with air exposure duration. GT tracked with pop-off biologgers showed consistent behavioral patterns including a short period (~ 5 min) of low activity. Collectively, these results provide the first quantitative evidence of how GT respond to catch-and-release when caught with conventional tackle and thus can be used to inform best practices and management strategies.