Blar i forfatter "Jørgensen, Terje"

Viser treff 1-5 av 5

    • Increasing catch efficiency for Nephrops in deep-water shrimp (Pandalus borealis) trawl fisheries 

      Ingólfsson, Ólafur Arnar; Jørgensen, Terje; Sistiaga, Manu; Herrmann, Bent; Kvalvik, Liz Beate Kolstad (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-14)
      In Skagerrak and the North Sea, coastal vessels harvest deep-water shrimp (Pandalus borealis) in a mixed fishery, in which catches of Nephrops (Nephrops norvegicus) are of economic importance for the fleet. Fishermen targeting shrimp in this area must use a sorting grid with a maximum bar spacing of 19 mm, which means that only the smallest Nephrops can pass through the grid to be retained in the ...

    • Potential for codends with shortened lastridge ropes to replace mandated selection devices in demersal trawl fisheries 

      Sistiaga, Manu; Brinkhof, Jesse; Herrmann, Bent; Larsen, Roger B.; Grimaldo, Eduardo; Cerbule, Kristine; Brinkhof, Ilmar; Jørgensen, Terje (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-28)
      In many trawl fisheries, codend size selectivity is supplemented by adding selection devices to the gear. In the Barents Sea gadoid fishery, combining diamond mesh codends with sorting grids is compulsory. However, the use of grids increases the costs and complexity of the gear, causing discontent among fishermen and prompting researchers to seek alternative solutions. Lastridge ropes are ropes ...

    • Prediction of goldsinny wrasse (Ctenolabrus rupestris) minimum size required to avoid escape through salmon (Salmo salar) farm nets 

      Sistiaga, Manu; Herrmann, Bent; Jørgensen, Terje (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-07)
      The salmon (Salmo salar) aquaculture industry has used various practices to treat salmon louse (Lepeophtheirus salmonis) infections, including mechanical, thermal, and chemical treatments. However, due to the environmental and fish welfare issues, and limitations associated with these practices, the use of cleaner fish has become a popular complementary delousing method. The goldsinny wrasse ...

    • Size-dependent escape risk of lumpfish (Cyclopterus lumpus) from salmonid farm nets 

      Herrmann, Bent; Sistiaga, Manu; Jørgensen, Terje (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-12-13)
      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 wild stocks. The guidelines for minimum sizes of cleaner fish to use in aquaculture cages are currently based on simple mesh penetration tests. However, these guidelines do not ...

    • Used vs. new: Does it have consequences for the performance of fishing gear? 

      Sistiaga, Manu; Jørgensen, Terje; Brinkhof, Ilmar; Herrmann, Bent; Brinkhof, Jesse (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-05-06)
      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 fishery, the use of a size sorting grid in front of the codend is compulsory. The flexigrid, a netting section containing two flexible grids, is the most widely used grid section in ...