Fish Behavior in Relation to Longlines

Løkkeborg, Svein; Fernö, Anders; Humborstad, Odd-Børre

doi:10.1002/9780813810966.ch5

Cited by 19 publications

(13 citation statements)

References 79 publications

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“…For example, a RW can delineate home ranges of fish (e.g., Alós et al, ; Palmer, Balle, March, Alós, & Linde, ; Pedersen & Weng, ) because fish frequently move predictably within a discrete home range area (Fagan et al., ; Kie et al., ). In addition, there is a relationship between swimming speed and gear encounter probability (Kallayil et al., ; Løkkeborg, Fernö, & Humborstad, ; Løkkeborg et al., ; Villegas‐Ríos et al., ). Alós et al () and Alós, Palmer et al.…”

Section: Review Of Factors Underlying Fish Vulnerabilitymentioning

confidence: 99%

What makes fish vulnerable to capture by hooks? A conceptual framework and a review of key determinants

et al. 2017

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Considerable time and money are expended in the pursuit of catching fish with hooks (e.g., handlining, angling, longlining, trolling, drumlining) across the recreational, commercial and subsistence fishing sectors. The fish and other aquatic organisms (e.g., squid) that are captured are not a random sample of the population because external (e.g., turbidity) and underlying internal variables (e.g., morphology) contribute to variation in vulnerability to hooks. Vulnerability is the probability of capture for any given fish in a given location at a given time and mechanistically explains the population‐level catchability coefficient, which is a fundamental and usually time‐varying (i.e., dynamic) variable in fisheries science and stock assessment. The mechanistic drivers of individual vulnerability to capture are thus of interest to fishers by affecting catch rates, but are also of considerable importance to fisheries managers whenever hook‐and‐line‐generated data contribute to stock assessments. In this paper, individual vulnerability to hooks is conceptualized as a dynamic state, in which individual fish switch between vulnerable and invulnerable states as a function of three interdependent key processes: an individual fish's internal state, its encounter with the gear, and the characteristics of the encountered gear. We develop a new conceptual framework of “vulnerability,” summarize the major drivers of fish vulnerability, and conclude that fish vulnerability involves complex processes. To understand vulnerability, a shift to interdisciplinary research and the integration of ecophysiology, fish ecology, fisheries ecology and human movement ecology, facilitated by new technological developments, is required.

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Section: Review Of Factors Underlying Fish Vulnerabilitymentioning

confidence: 99%

What makes fish vulnerable to capture by hooks? A conceptual framework and a review of key determinants

et al. 2017

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“…The common bait types used, such as mackerel, herring and squid, have many alternative uses including human consumption. A growing market demand for these conventional baits in the last decade has led to an increase in price (Løkkeborg, Fernö, & Humborstad, ; Løkkeborg, Siikavuopio, Humborstad, Palm, & Ferter, ), leading to intensified search for alternative baits. By‐products from the marine food industry are obvious candidates, and baits made from these resources could make fishing more cost efficient and utilise material that otherwise would be regarded as waste.…”

Section: Introductionmentioning

confidence: 99%

“…Odours released by prey organisms are important to elicit food‐searching behaviour; many fish species rely on olfaction for prey detection at great distances (Atema, ; Bjordal & Løkkeborg, ; Hara, , ; Thomsen, Humborstad, & Furevik, ). Norwegian bait‐fishing for cod usually takes place in deep waters, mainly during the winter and in habitats of high turbidity, all of which are conditions with limited visibility (Hara, ; Løkkeborg et al., ). Under such conditions, the importance of olfactory prey detection becomes critical.…”

Section: Introductionmentioning

confidence: 99%

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Testing baits prepared from by-product of the shrimp and snow crab industry in the pot fishery for Gadus morhua (Linnaeus, 1758) and Pollachius virens (Linnaeus, 1758)

et al. 2017

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Summary In a study between October and November 2015 in northern Norway, bait prepared from the by‐product of the shrimp and snow crab industry was employed in the pot fishery to capture cod and saithe. Frozen natural herring was used as control bait. Pots with the three bait types were placed 1,000 m apart in order to eliminate the risk of interaction between the different baits. In total 11 sampling periods were conducted. There were no significant differences in catch rates between the different baits tested on cod and saithe. The manufactured bait tested in this study showed a continuous release of odours over a 14‐day period. Results show that the water content of the bait increases rapidly in the first phase of the immersion (until day 7), and the corresponding loss of bait mass (dry weight) suggest some physical disintegration (erosion) of the bait until the water content stabilizes. This study illustrates that it is possible to replace natural herring with hydrolysates from by‐products from shrimp or snow crab industry in the Norwegian pot fishery of cod and saithe.

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“…Longlining is a widely used passive fishing method that is efficient and selective and can catch top‐quality fish (Løkkeborg et al. ). 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.…”

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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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Fish Behavior in Relation to Longlines

Cited by 19 publications

References 79 publications

What makes fish vulnerable to capture by hooks? A conceptual framework and a review of key determinants

What makes fish vulnerable to capture by hooks? A conceptual framework and a review of key determinants

Testing baits prepared from by-product of the shrimp and snow crab industry in the pot fishery for Gadus morhua (Linnaeus, 1758) and Pollachius virens (Linnaeus, 1758)

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

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