Selective haddock (Melanogrammus aeglefinus) trawling: Avoiding cod (Gadus morhua) bycatch |
| |
| Authors: | Ludvig A Krag Rene Holst Niels Madsen Kurt Hansen Rikke P Frandsen |
| |
| Institution: | 1. DTU Aqua, Technical University of Denmark, North Sea Science Park, DK-9850 Hirtshals, Denmark;2. SINTEF, North Sea Science Park, DK-9850 Hirtshals, Denmark;1. SINTEF Fisheries and Aquaculture (SFA), Brattørkaia 17C, 7010 Trondheim, Norway;2. SINTEF Fisheries and Aquaculture, Fishing Gear Technology, Willemoesvej 2, 9850 Hirtshals, Denmark;3. Norwegian College of Fishery and Aquatic Science, University of Tromsø, 9037 Breivika, Tromsø, Norway;1. Consiglio Nazionale delle Ricerche (CNR), Istituto di Scienze Marine (ISMAR) [National Research Council (CNR), Institute of Marine Sciences (ISMAR)], Largo Fiera della Pesca, 60125 Ancona, Italy;2. Consiglio Nazionale delle Ricerche (CNR), Istituto per l’Ambiente Marino Costiero (IAMC) [National Research Council (CNR), Institute of Coastal Marine Environment (IAMC)], Sp. San Raineri 86, 98122 Messina, Italy;3. SINTEF Fisheries and Aquaculture, Fishing Gear Technology, Willemoesvej 2, 9850 Hirtshals, Denmark;1. SINTEF Fisheries and Aquaculture, Fishing Gear Technology, Willemoesvej 2, 9850 Hirtshals, Denmark;2. SINTEF Fisheries and Aquaculture (SFA), Brattørkaia 17C, N-7010 Trondheim, Norway;3. University of Tromsø, Breivika, N-9037 Tromsø, Norway;1. Thünen Institute for Baltic Sea Fisheries, Alter Hafen Süd 2, Rostock 18069, Germany;2. SINTEF Fisheries and Aquaculture, Fishing Gear Technology, Willemoesvej 2, Hirtshals, 9850, Denmark;3. Swedish University of Agricultural Sciences (SLU), Department of Aquatic Resources/Institute of Marine Research, Turistgatan 5, Lysekil 453 30, Sweden;4. Norwegian College of Fishery and Aquatic Science, University of Tromsø, 9037 Breivika, Tromsø, Norway;1. IFREMER, Department of Biological Resources and Environment, Fisheries Science and Technology Research Unit, Laboratory for Fisheries Technologies and Fish Biology (RBE/STH/LTBH), 8 rue François Toullec, F-56100 Lorient, France;2. IFREMER, Department of Biological Resources and Environment, Fisheries Science for the English Channel and North Sea, Fisheries Resources Laboratory (RBE/HMMN/RHPEB), Avenue du Général de Gaulle, F-14520 Port-en-Bessin-Huppain, France;1. Thünen-Institute of Baltic Sea Fisheries, Palmaille 9, 22767 Hamburg, Germany;2. SINTEF Fisheries and Aquaculture, Fishing Gear Technology, Willemoesvej 2, 9850 Hirtshals, Denmark;3. Technical University of Denmark, National Institute of Aquatic Resources, North Sea Science Park, PO Box 101, DK-9850 Hirtshals, Denmark;4. Thünen-Institute of Baltic Sea Fisheries, Alter Hafen Süd 2, 18069 Rostock, Germany;5. National Marine Fisheries Research Institute/Morski Instytut Rybacki – Panstwowy Instytut Badawczy, ul. Kollataja 1, 81-332 Gdynia, Poland |
| |
| Abstract: | The critical condition of the North Sea cod stocks has resulted in restrictions on not only cod, but also haddock and other species that are caught together with cod. Thus full exploitation of the haddock stock is unachievable unless cod can be excluded from the haddock catch. We designed a selective trawl based on the behavioral differences between haddock and cod as they enter a trawl, i.e., cod stay close to the seabed whereas haddock rise above it. The trawl's fishing line is raised ～60 cm above the seabed to allow cod to escape beneath the trawl while haddock are retained. To collect the escapees, three sampling bags were attached beneath the raised fishing line. The selective haddock trawl reduced the total catch of cod by 55% during the day and 82% at night, and 99% of the marketable haddock was caught during the day and 89% at night. Cod escape rates were highly length dependent: smaller cod escaped the trawl in greater numbers than did larger individuals. Whiting, saithe, lemon sole, and plaice were included in the analysis. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
