Influence of Landing Net Mesh Type on Handling Time and Tissue Damage of Angled Brook Trout

Lizée, Teah W.; Lennox, Robert J.; Ward, Taylor D.; Brownscombe, Jacob W.; Chapman, Jacqueline M.; Danylchuk, Andy J.; Nowell, Liane; Cooke, Steven J.

doi:10.1002/nafm.10033

Cited by 21 publications

(12 citation statements)

References 19 publications

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“…) and the use of materials that may be less injurious to fish such as knotless rubber (Lizée et al. ). As fish caught by beach seine had low injury rates with 5‐cm stretch mesh, using a similar mesh size may be an effective gear restriction for fisheries using dip nets.…”

Section: Discussionmentioning

confidence: 99%

Consequences of Fishery Gear Type and Handling Practices on Capture and Release of Wild Steelhead on the Bulkley River

Twardek

Elmer

Beere

et al. 2019

N American J Fish Manag

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Steelhead Oncorhynchus mykiss are captured and released during spawning migrations by the commercial, subsistence (Indigenous), and recreational fishing sectors, though the consequences of these fisheries interactions on steelhead migration are poorly understood. This study evaluated injury, reflex impairment, behavior, and survival of released wild adult steelhead following capture in the subsistence dip-net, subsistence beach-seine, and recreational angling fisheries of the Bulkley River, British Columbia. Wild steelhead were captured using common handling practices employed in each fishery and were monitored postrelease using radiotelemetry. A greater proportion of steelhead captured by dip net and seine had impaired righting reflexes compared with angled fish, but only fish captured by dip net had notably higher incidence of injury (i.e., net marks, torn fins, flesh wounds, scale loss). Fish captured by dip and seine net had considerably faster peak migration rates (>4,000 m/d) than angled fish (<1,000 m/d), which likely reflects when the steelhead are encountered during their migration in these fisheries (earlier versus later stages). Air exposure (15-74 s) and water temperature (9.2-15.1°C) at the time of capture had significant negative relationships with 24-h fallback behavior (temperature only), intermediate-term (10-20 d after capture) migration rates, and peak migration rates in dip-net-captured steelhead. There were no significant effects of capture duration or fish length on injury, righting reflexes, or migratory behavior. Immediate mortality upon release was rare and occurred in only one fish captured by dip net. The 3-d survival was 88-97% for dip-net-caught steelhead, 96-100% for seine-caught steelhead, and 68-100% for angled steelhead. Despite inherent differences in timing and location between these fisheries, findings suggest that air exposure and water temperature can decrease steelhead migration rates. Fishers should look for opportunities to avoid or minimize these capture and handling conditions when releasing steelhead.

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Section: Discussionmentioning

confidence: 99%

Consequences of Fishery Gear Type and Handling Practices on Capture and Release of Wild Steelhead on the Bulkley River

Twardek

Elmer

Beere

et al. 2019

N American J Fish Manag

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show abstract

“…Other studies on other types of angling tools and techniques by the authors have helped provide clarity about their efficacy (e.g. fish gripping devices, Danylchuk et al., 2008; landing net mesh types, Lizee et al., 2017), yet those studies were done in a bit of a vacuum when it comes to the angling industry. Moving forward, using this example of hook disgorgers for deeply hooked fish, more explicit partnerships among anglers, the angling trade, scientists and regulators are encouraged (see Cooke et al., 2017; Danylchuk et al., 2017), when it comes to evaluating whether tools created by the industry and angling community are worthy of use because of the benefits to the fish.…”

Section: Resultsmentioning

confidence: 99%

Hook disgorgers remove deep hooks but kill fish: A plea for cutting the line

Cooke

Danylchuk

2020

Fisheries Management Eco

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Recreational fishing can result in deep hooking (e.g. in the gullet) of fish that are intended to be released, leading to the development of various tools intended to assist with hook removal. So‐called “hook disgorgers” are typically marketed as being a mechanism to retrieve the hook while doing so in a way that reduces harm to the fish, despite there being many studies that demonstrate that it is best to cut the line for deeply hooked fish. A study was designed to test the effectiveness of six different hook disgorgers for deeply hooked smallmouth bass, Micropterus dolomieu Lacépède, captured using baitholder hooks relative to shallow hooked controls and fish for which the line was cut. Reflex impairment and survival at 10 min, 1 hr and 24 hr were assessed. The study was terminated after early results revealed that all but one of the fish that had the hook removed died (n = 17), while all fish that were hooked in the jaw (n = 4) or had the line cut (n = 5) survived. The ethical conundrum faced by the research team is discussed here, recognising that an incomplete study would have less statistical rigour even though it was very clear that disgorgers used when hooks were in the gullet killed the fish. Stopping rules are common in pharmaceutical trials and can also be used to inform catch‐and‐release research to maintain fish welfare. Best practices for anglers include cutting the line when fish are hooked in the gullet, and changing fishing strategies and gear type when deep hooking is encountered on a routine basis, otherwise mortality can be unnecessarily high.

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“…For example, it has been discussed that hook entanglement in landing nets is a period of additional air exposure. This can potentially be eliminated by the use of rubberised, large mesh nets, as these can reduce the risk of hook entanglement and consequent abrasive damage (Lizée et al, 2018). Their mandated use would thus provide benefits to fish welfare and angler experiences.…”

Section: Discussionmentioning

confidence: 99%

Temperature effects on the physiological status and reflex impairment in European grayling Thymallus thymallus from catch-and release angling

2019

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There is a growing body of research communicating how angler behaviour can be adjusted and optimised to reduce fish injury and impairment resulting from the capture of recreationally angled fishes. However, few studies have focused on how individual and interacting abiotic variables influence the outcomes of catch and release (C&R) angling. A population of European grayling Thymallus thymallus at their upper thermal limit of their geographic distribution provided a model cold-water species that was representative of other fishes sensitive to climate warming impacts and that are subjected to C&R across different seasons. Here, C&R angling for T. thymallus was conducted during summer (>15 o C) and winter (<10 o C), with 97 fish captured (220-490 mm). Measurement of tertiary stress responses (reflex impairment, as time to body equilibrium, an important predictor of post-release mortality) revealed that at >15 o C, fish took significantly longer to regain equilibrium (178 ± 44 s) than at <10 o C (70 ± 40 s). Multivariate testing revealed air exposure had a stronger effect on reflex impairment than fight time. Testing of post-capture, prerelease blood chemistry on sub-samples of captured fish revealed fish had significantly elevated levels of both glucose and lactate at >15 o C versus <10 o C, In entirety, these results suggest that stress responses and post-release mortality risk in cold-water fishes subjected to C&R could be reduced via temperature-informed fishery management practises, and by minimising, or ideally eliminating, air exposure.

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Influence of Landing Net Mesh Type on Handling Time and Tissue Damage of Angled Brook Trout

Cited by 21 publications

References 19 publications

Consequences of Fishery Gear Type and Handling Practices on Capture and Release of Wild Steelhead on the Bulkley River

Consequences of Fishery Gear Type and Handling Practices on Capture and Release of Wild Steelhead on the Bulkley River

Hook disgorgers remove deep hooks but kill fish: A plea for cutting the line

Temperature effects on the physiological status and reflex impairment in European grayling Thymallus thymallus from catch-and release angling

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