Blar i Brage IMR på forfatter "Herrmann, Bent"
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Prediction of square mesh panel and codend size selectivity of blue whiting based on fish morphology
Cuende, Elsa; Arregi, Luis; Herrmann, Bent; Sistiaga, Manu; Aboitiz, Xabier (Peer reviewed; Journal article, 2020)Square mesh panels (SMPs) are selective devices used extensively to supplement codend size selectivity in trawl fisheries. Therefore, predictions of the effect of mesh size in both SMPs and codends on size selectivity are ... -
Quantification of bell-shaped size selectivity in shrimp trawl fisheries using square mesh panels and a sorting cone after a Nordmøre grid
Sistiaga, Manu Berrondo; Herrmann, Bent; Larsen, Roger B.; Brinkhof, Jesse (Peer reviewed; Journal article, 2019)Shrimp trawlers in the Barents Sea use a Nordmøre sorting grid ahead of a small-mesh codend to avoid bycatch while catching shrimps efficiently. However, small fish can still pass through the grid to enter the codend, which ... -
Quantification of gear inflicted damages on trawl-caught haddock in the Northeast Atlantic fishery
Sistiaga, Manu; Herrmann, Bent; Brinkhof, Jesse; Larsen, Roger B.; Jacques, Nadine; Santos, Juan; Gjøsund, Svein Helge (Peer reviewed; Journal article, 2020)External damages are indicators of the overall quality of fish and fish welfare. Haddock is an important commercial species widespread in the North Atlantic, but few studies related to quality have been carried out on this ... -
Quantifying the escape mortality of trawl caught Antarctic krill (Euphausia superba)
Krafft, Bjørn Arne; Krag, Ludvig Ahm; Engås, Arill; Nordrum, Sigve; Bruheim, Inge; Herrmann, Bent (CCAMLR;WG-EMM-16/04, Conference object, 2016) -
Quantifying the Escape Mortality of Trawl Caught Antarctic Krill (Euphausia superba)
Krafft, Bjørn Arne; Krag, Ludvig Ahm; Engås, Arill; Nordrum, Sigve; Bruheim, Yngve; Herrmann, Bent (Journal article; Peer reviewed, 2016-09-13)Antarctic krill (Euphausia superba) is an abundant fishery resource, the harvest levels of which are expected to increase. However, many of the length classes of krill can escape through commonly used commercial trawl mesh ... -
Release efficiency and selectivity of four different square mesh panel configurations in the Basque mixed bottom trawl fishery
Cuende, Elsa; Arregi, Luis; Herrmann, Bent; Sistiaga, Manu Berrondo; Basterretxea, Mikel (Journal article; Peer reviewed, 2020)Reduction of discards from the Basque mixed bottom trawl fishery is a challenge. To improve the selective properties of the gear used by the fleet and supplement codend size selection, a square mesh panel (SMP) installed ... -
Seleksjon i 4-panels enkeltristseksjon med- og uten løftepanel. Rapport fra fullskalaforsøk gjennomført ombord på tråleren "Ramoen" i perioden 28.oktober - 10.november 2013
Grimaldo, Eduardo; Lilleng, Dagfinn; Jørgensen, Terje; Sistiaga, Manu Berrondo; Herrmann, Bent (Research report, 2014)Resultatene fra toktet viste at løftepanelet foran sorteringsristen hadde en betydelig effekt på parameteren Cgrid, dvs. sannsynligheten for at en fisk kommer i kontakt med rista, og dermed på seleksjonen av torsk. Forskjellen ... -
Sequential codend improves quality of trawlcaught cod
Brinkhof, Jesse; Olsen, Stein Harris; Ingólfsson, Ólafur Arnar; Herrmann, Bent; Larsen, Roger B. (Peer reviewed; Journal article, 2018)Trawl-caught fish are frequently associated with deteriorated catch quality. This study presents a new dual sequential codend concept with the aim of improving the quality of trawl-caught fish by minimizing the frequency ... -
Size selection of Antarctic krill (Euphausia superba) in a commersial codend and trawl body
Herrmann, Bent; Krag, Ludvig Ahm; Krafft, Bjørn Arne (Journal article; Peer reviewed, 2018)During fishing, many fish species are able to avoid the net walls of the trawl body and so the majority of size selection occurs in the codend of the net. Antarctic krill (Euphausia superba) are regarded as true planktonic ... -
Size Selection of Antarctic Krill (Euphausia superba) in Trawls
Krag, Ludvig A.; Herrmann, Bent; Iversen, Svein A.; Engås, Arill; Nordrum, Sigve; Krafft, Bjørn A. (Journal article; Peer reviewed, 2014-08-08)Trawlers involved in the Antarctic krill (Euphausia superba) fishery use different trawl designs, and very little is known about the size selectivity of the various gears. Size selectivity quantifies a given trawl’s ability ... -
Size selectivity and catch efficiency of bottom trawl with a double sorting grid and diamond mesh codend in the North-east Atlantic gadoid fishery
Brinkhof, Jesse; Larsen, Roger B.; Herrmann, Bent; Sistiaga, Manu (Peer reviewed; Journal article, 2020)This study investigated the size selectivity and catch efficiency in the North-east Atlantic demersal trawl fishery targeting cod (Gadus morhua) and haddock (Melanogrammus aeglefinus). The use of a sorting grid followed ... -
Size-dependent escape risk of lumpfish (Cyclopterus lumpus) from salmonid farm nets
Herrmann, Bent; Sistiaga, Manu; Jørgensen, Terje (Peer reviewed; Journal article, 2020)In the last decade, the salmon aquaculture industry has considerably increased the use of lumpfish juveniles as cleaner fish. Potential escape of reared lumpfish into the wild may spread diseases or genetically contaminate ... -
Species separation efficiency and effect of artificial lights with a horizonal grid in the Basque bottom trawl fishery
Cuende, E.; Herrmann, Bent; Sistiaga, Manu; Basterretxea, M.; Edridge, A.; Mackenzie, E.K.; Kynoch, R.J.; Diez, G. (Peer reviewed; Journal article, 2022)Achieving effective size selectivity for different species within a fishing gear is a major challenge in mixed fisheries. Fish behaviour may be exploited to separate species into separate codends where different selective ... -
Stimulating release of undersized fish through a square mesh panel in the Basque otter trawl fishery
Cuende, Elsa; Arregi, Luis; Herrmann, Bent; Sistiaga, Manu Berrondo; Onandia, Inigo (Journal article; Peer reviewed, 2019)Discards of regulated species in the Basque mixed trawl fishery are a challenge. In 2006, a square mesh panel (SMP) was introduced in the fishery to increase the release efficiency of undersized fish. However, studies have ... -
Understanding and predicting the effect of entrance cone diameters on the catch efficiency of snow crabs (Chionoecetes opilio) in conical pots
Cerbule, Kristine; Herrmann, Bent; Grimaldo Vela, Eduardo Enrique; Sistiaga, Manu; Brinkhof, Jesse; Vollstad, Jørgen (Peer reviewed; Journal article, 2022)Conical pots with a plastic entrance cone on the top are a type of fishing gear used to harvest snow crabs (Chionoecetes opilio) in Arctic regions. In this study, we assessed the effect of pot entrance diameter on the catch ... -
Used vs. new: Does it have consequences for the performance of fishing gear?
Sistiaga, Manu; Jørgensen, Terje; Brinkhof, Ilmar; Herrmann, Bent; Brinkhof, Jesse (Peer reviewed; Journal article, 2023)Sea trials to test size selectivity equipment in trawls are often limited in time because they are costly, and the results can be influenced by multiple factors that are often overlooked. In the Barents Sea gadoid trawl ...