Bait, Bait Loss, and Depredation in Pelagic Longline Fisheries–A Review

Kumar, K. V. Aneesh; Pravin, P.; Meenakumari, B.

doi:10.1080/23308249.2016.1162134

Cited by 23 publications

(15 citation statements)

References 49 publications

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“…While not yet considered a viable alternative for high-volume commercial fisheries (Aneesh Kumar, Pravin, & Meenakumari, 2016), additional research on selective bait types could provide meaningful strides in by-catch reduction for some hook fisheries. Adoption of circle hooks over straight-shanked "J" hooks has been shown to decrease deep hooking, reduce hooking in soft tissue and increase survival in several species in both troll and longline fisheries (reviewed in Serafy et al, 2012).…”

Section: Mitigation Optionsmentioning

confidence: 99%

A synthesis to understand responses to capture stressors among fish discarded from commercial fisheries and options for mitigating their severity

et al. 2018

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Discarding non‐target fish from commercial fisheries is controversial and has been a persistent concern for fisheries managers globally. Discard management strategies typically begin by understanding mortality rates among discarded fish, a challenging task given the dynamic, highly context‐specific nature of fisheries. An alternative is to develop our knowledge of how stressors operate by first understanding the causes of mortality that drive this context dependence. Particularly relevant to mitigation efforts is an understanding of how fish respond to the physical factors of fishing, such as the gear itself and methods of fishing and handling the gear. We provide a synthesis of how commercial fishing methods may influence discard mortality and outline means by which capture‐induced stress and injury can be mitigated for common commercial gear types, emphasizing method variants or alternatives during capture, handling, and release that could improve survival. This synthesis identifies exhaustion and injury as the most detrimental and ubiquitous stressors experienced by discarded fish, with few options for mitigating their effects. Trawls and hanging net fisheries are identified as the most harmful gears for by‐catch, characterized by high stress regardless of method variants and limited options for mitigation. Irrespective of gear type and type of stressor, minimizing durations of capture and handling and encouragement of good handling behaviour (e.g., during landing and sorting) will reduce the magnitude of stress and injury in fish, and ultimately increase survival.

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Section: Mitigation Optionsmentioning

confidence: 99%

A synthesis to understand responses to capture stressors among fish discarded from commercial fisheries and options for mitigating their severity

et al. 2018

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“…Additional factors, such as the firmness of the bait and how well it holds to the hook, are important characteristics influencing the final effectiveness of each type of bait, as they determine how long the bait stays on the hook (Kumar et al. ).…”

Section: Discussionmentioning

confidence: 99%

“…Once the fish is close to the bait, other factors, such as size and shape, increase in importance for attracting the fish to attack the bait. Additional factors, such as the firmness of the bait and how well it holds to the hook, are important characteristics influencing the final effectiveness of each type of bait, as they determine how long the bait stays on the hook (Kumar et al 2016).…”

Section: Discussionmentioning

confidence: 99%

Effect of Bait Type and Bait Size on Catch Efficiency in the European Hake Merluccius merluccius Longline Fishery

et al. 2018

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We investigated the effect of bait type and bait size on the catch efficiency of a demersal longline fishery targeting European Hake Merluccius merluccius in the North Sea. Automation of the labor-intensive processes onboard fishing vessels requires finding alternatives to the traditional bait used in the fishery (i.e., whole European Pilchard Sardina pilchardus). Of the six alternative baits investigated, four resulted in significant reductions in catch efficiency ranging from 32% to 90%. Only chopped Atlantic Herring Clupea harengus was a reasonable alternative bait, with an estimated non-significant loss of only 2.12% in European Hake catch efficiency. Our results demonstrated that choice of bait type and size can affect the catch efficiency of different sizes of European Hake. Thus, the choice of bait may also affect the size distribution of the catch. The latter highlights the importance of considering fish size when inferring the effect of bait choice on the catch efficiency of longline fisheries.Longlining is a widely used passive fishing method that is efficient and selective and can catch top-quality fish (Løkkeborg et al. 2010). In contrast to other popular fishing gears, such as trawls and seines, the effectiveness of a longline depends on both the construction of the gear (Herrmann et al. 2017) and the attractiveness of the bait Subject editor:

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“…Depredation is usually defined as “the partial or complete removal of hooked fish or bait from fishing gear… by predators likes cetaceans, sharks, bony fish, birds, squids, crustaceans and others” distinguishing it from predation, that is, “the taking of free swimming fish (or other organisms)…” (Donoghue, Reeves & Stone, ; Gilman et al., ; Romanov et al., ). The partial or even complete removal of the catch and biting of the fish while being caught can lead to significant financial losses to the fisheries (Kumar, Pravin & Meenakumari, ; Nishida & Shiba, ; Rabearisoa, Bach, Tixier & Guinet, ).…”

Section: Introductionmentioning

confidence: 99%

Depredation in pelagic surface longlines in the Atlantic and Indian Oceans

Muñoz‐Lechuga

Coelho

2018

Fisheries Management Eco

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Depredation has aroused great interest over the last few decades, mainly due to the expansion of distant fishing, in particular longlines. For this study, captures and depredation records were taken by scientific observers on board Portuguese commercial longline vessels in the Atlantic and Indian Oceans between 2011 and 2016. A total of 1,336 fishing sets were monitored, with a total of 86,183 fish captured, including 1,681 depredation events. The percentage of depredation tended to increase along the time series, except in the last year where a decrease was noted. Significant differences between sizes of swordfish Xiphias gladius damaged by predators were observed in the Indian Ocean but not in the Atlantic. The highest proportions of depredation were observed on tuna and small pelagic fishes in both oceans. For swordfish, the effects of spatial variables were significant on the rate of depredation events. The results provide an overview of the depredation patterns in the Portuguese pelagic longline fishery in the Atlantic and Indian Oceans, which can inform and improve fisheries management and contribute to the development of effective mitigation measures to reduce the impacts of depredation on fisheries.

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Bait, Bait Loss, and Depredation in Pelagic Longline Fisheries–A Review

Cited by 23 publications

References 49 publications

A synthesis to understand responses to capture stressors among fish discarded from commercial fisheries and options for mitigating their severity

A synthesis to understand responses to capture stressors among fish discarded from commercial fisheries and options for mitigating their severity

Effect of Bait Type and Bait Size on Catch Efficiency in the European Hake Merluccius merluccius Longline Fishery

Depredation in pelagic surface longlines in the Atlantic and Indian Oceans

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