Understanding sorting grid and codend size selectivity of Greenland halibut (Reinhardtius hippoglossoides)

Herrmann, Bent; Sistiaga, Manu Berrondo; Larsen, Roger B.; Nielsen, Kåre Nolde; Grimaldo, Eduardo

doi:10.1016/j.fishres.2013.04.004

Cited by 49 publications

(44 citation statements)

References 21 publications

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“…This methodology has been successfully used to estimate mesh selectivity of the most relevant demersal fish species in the Barents Sea: cod (G morhua), haddock (M. aeglefinus), Greenland halibut (R. hippoglossoides), and redfish (Sebastes ssp.) [31,[37][38][39]. The results obtained with the application of FISHSELECT have proved the reliability of the method as they are coherent with the results registered from earlier sea trials [37][38][39].…”

Section: The Fishselect Methodologysupporting

confidence: 82%

“…[31,[37][38][39]. The results obtained with the application of FISHSELECT have proved the reliability of the method as they are coherent with the results registered from earlier sea trials [37][38][39]. Thus, if we consider the flexibility the method offers compared to the traditional selectivity measuring methods, the value of the method becomes obvious.…”

Section: The Fishselect Methodologysupporting

confidence: 75%

“…Step 2: Fall-through experiments Fall-through experiments are carried out to decide if a fish can in principle physically pass through a certain rigid shape (subjected to the force of gravity only) (Figure 8). These shapes are perforated in 5-mm-thick solid nylon plates [39]. The shapes tested normally include diamonds, hexagons, and rectangles; however, there are no restrictions to the shapes one can test and use in FISHSELECT.…”

Section: Fisheries and Aquaculture In The Modern World 84mentioning

confidence: 99%

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Trawl Selectivity in the Barents Sea Demersal Fishery

Grimaldo¹,

Sistiaga²,

Herrmann³

et al. 2016

Fisheries and Aquaculture in the Modern World

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This chapter provides a general overview of the Barents Sea demersal trawl fishery. First, it reviews historical catch levels and current biomass status of four commercially important demersal species (cod, haddock, Greenland halibut, and redfish) and includes an overview of their management plan that has been carried out by the Joint Norwegian-Russian commission. Then, it presents the evolution of the technical regulations for improving size selectivity in this fishery and describes current challenges in gear selectivity. Later, this chapter describes the concept of size selectivity, introduces the selective parameters that define a selection curve, and progressively introduces different parametric models that describe the selection process. The most common experimental methods and gear used to collect selectivity data are described, and their advantages and disadvantages are discussed. Finally, this chapter describes an alternative, or a complementary method, to the conventional estimation of trawl selectivity-the FISHSELECT method. This method is based on morphology measurements and fish penetration models to estimate the selective properties of different mesh shapes and sizes at different mesh openings, which are later used to provide simulation-based prediction of size selectivity. FISHSELECT has already been applied to four important species of the Barents Sea Demersal Fishery, and the results have in all cases showed to be coherent with the results obtained from sea trial results.

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Section: The Fishselect Methodologysupporting

confidence: 82%

Section: The Fishselect Methodologysupporting

confidence: 75%

Section: Fisheries and Aquaculture In The Modern World 84mentioning

confidence: 99%

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Trawl Selectivity in the Barents Sea Demersal Fishery

Grimaldo¹,

Sistiaga²,

Herrmann³

et al. 2016

Fisheries and Aquaculture in the Modern World

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“…We adapted a flexible model for r(l, v) often applied for evaluating the efficiency of fishing gear in catch comparison studies (Krag et al 2014(Krag et al , 2015. This model has also been applied to model size selection of Greenland halibut (Reinhardtius hippoglossoides) in a sorting grid (Herrmann et al 2013):…”

Section: Collection Of Release Efficiency Data and Underwater Recordingsmentioning

confidence: 99%

“…The compulsory size selectivity device for the trawlers targeting cod and haddock (Melanogrammus aeglefinus) in the Barents Sea consists of a rigid sorting grid with a minimum bar spacing of 55 mm and a diamond mesh cod end with a minimum mesh size of 130 mm. Fishermen are allowed to use three different grid systems: the Sort-X double grid system (Larsen and Isaksen 1993); the Sort-V single grid system (Jørgensen et al 2006;Herrmann et al 2013); and the Flexigrid double grid system . The sorting area of these grids is limited, and fishermen report that fish accumulate in front and behind the sorting grids at high catch rates (>10 t·h -1 ).…”

Section: Introductionmentioning

confidence: 99%

Improving release efficiency of cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) in the Barents Sea demersal trawl fishery by stimulating escape behaviour

Grimaldo

Sistiaga

Herrmann

et al. 2018

Can. J. Fish. Aquat. Sci.

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Abstract:We tested the ability of stimulators to improve the release efficiency of cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) through the meshes of a square mesh section installed in a trawl. The section was tested in three different configurations: without any stimulation device, with a mechanical stimulation device, and with LED light stimulation devices. We analysed and compared the behaviour of cod and haddock in all three configurations based on release results and underwater recordings. Parallel to the fishing trials, we carried out fall-through tests to determine the upper physical size limits for cod and haddock to be able to escape through the square meshes in the section. This enabled us to infer whether lack of release efficiency was due to fish behaviour or release potential of the square meshes in the section. The results showed that the escape behaviour of haddock can be triggered by mechanical stimulation. In contrast, cod did not react significantly to the presence of mechanical stimulators. LED light stimulation had some effect on the behaviour of haddock, but not on cod.Résumé : Nous avons vérifié la capacité de stimulateurs d'améliorer l'efficacité de la libération de morues (Gadus morhua) et d'aiglefins (Melanogrammus aeglefinus) par les mailles d'une section de mailles carrées installée dans un chalut. La section a été mise à l'essai selon trois configurations différentes, soit sans aucun instrument de stimulation, avec un instrument de stimulation mécanique et avec des instruments de stimulation à lumière DEL. Nous avons analysé et comparé le comportement des morues et des aiglefins dans les trois configurations à la lumière des résultats de libération et d'enregistrements sous l'eau. Parallèlement aux essais de pêche, nous avons mené des essais de passage par gravité afin de déterminer les limites supérieures des tailles auxquelles les morues et aiglefins peuvent s'évader par les mailles carrées dans la section. Cela nous a permis d'établir si l'absence d'une libération efficace était due au comportement des poissons ou au potentiel de libération des mailles carrées dans la section. Les résultats montrent que le comportement d'évasion des aiglefins peut être déclenché par une stimulation mécanique. Les morues, au contraire, n'ont pas présenté de réaction significative à la présence de stimulateurs mécaniques. La stimulation à la lumière DEL a eu un certain effet sur le comportement des aiglefins, mais pas sur celui des morues. [Traduit par la Rédaction]

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A review of bycatch reduction in demersal fish trawls

Kennelly

Broadhurst

2021

Rev Fish Biol Fisheries

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Understanding sorting grid and codend size selectivity of Greenland halibut (Reinhardtius hippoglossoides)

Cited by 49 publications

References 21 publications

Trawl Selectivity in the Barents Sea Demersal Fishery

Trawl Selectivity in the Barents Sea Demersal Fishery

Improving release efficiency of cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) in the Barents Sea demersal trawl fishery by stimulating escape behaviour

A review of bycatch reduction in demersal fish trawls

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