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  • 11
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    Verringerung der Dorschbeifänge in der Schleppnetzfischerei auf Plattfische mit einem im Oberblatt reduziertem Grundschleppnetz (2021)
    In:  bernd.mieske@vti.bund.de | http://aquaticcommons.org/id/eprint/2945 | 1240 | 2011-09-29 18:14:26 | 2945 | Johann Heinrich von Thünen-Institut, Bundesforschungsinstitut für Ländliche Räume, Wald und Fischerei
    Details
    Publication Date: 2021-06-30
    Description: Trials with the “topless” version (with reduced upper panel) of the bottom trawl resulted in a 63 % reduction of cod bycatch in numbers, compared to the complete trawl. Flounder catches increased by 120 % on average. Further modification of the net opening height to optimize the trawl performance are underway.
    Description: Johann Heinrich von Thünen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung - Information Fishery research in 2010. Johann Heinrich von Thünen-Institut, Institut für Ostseefischerei, AG Fischereitechnik
    Keywords: Conservation ; Fisheries ; Engineering ; Dorsch ; Flunder ; Baltic Sea ; Fangtechnik ; Kliesche
    Repository Name: AquaDocs
    Type: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 25-35
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  • 12
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    Horizontale Trennblätter in Trawls zur Verringerung von Discards in der Ostsee (2021)
    In:  bernd.mieske@vti.bund.de | http://aquaticcommons.org/id/eprint/3078 | 1240 | 2012-04-25 23:08:57 | 3078 | Bundesforschungsanstalt für Fischerei
    Details
    Publication Date: 2021-07-01
    Description: A primary objective of the Common Fishery Policy of the European Union is the reduction of discards and unwanted by-catches in the fishery. In principle this could be achieved if the catching methods were optimised for this. Still high numbers of undersized flatfish are caught in the bottom trawls. Although EU regulations make the use of the BACOMA codend mandatory in the Baltic Sea cod areable to escape through square mesh escape window of the BACOMA net the whereas flatfish still remain in the cod-end. Gear experiments have been carried out with the aim to better separate cod from the flatfish fraction already when entering the rear belly, making use of the natural behaviour of the fish, i. e. the preferred swimming distance from the bottom of the net in the funnel. As cod have a natural tendency to keep a relativly great distance from the bottom, flatfish tend to stay close to it. It was attempted to separate both fractions by splitting the funnel into an upper and lower part with a horizontal panel. This wastested for two different nets, a cod trawl to separate cod from flatfish, and an eel-trawl to separate cod and flatfish from eel. Cod and flatfish separation is best at a panel distance of 50 cm from the bottom. Thus, 74 % of the cod were found in the upper panel, whereas 75 % of the flounder were in the lower section. A separation of eel from cod was however not possible, since eel tend to rise to the upper part of the net, together with cod.
    Description: Johann Heinrich von Thünen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung = Information on Fishery Research in 2010.
    Keywords: Fisheries ; fishing technique ; drag net
    Repository Name: AquaDocs
    Type: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 11-17
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  • 13
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    Ein Vorschlag zur Senkung des Schlepppwiderstandes von Grundschleppnetzen (2021)
    In:  bernd.mieske@vti.bund.de | http://aquaticcommons.org/id/eprint/2958 | 1240 | 2011-09-29 18:04:56 | 2958 | Johann Heinrich von Thünen-Institut, Bundesforschungsinstitut für Ländliche Räume, Wald und Fischerei
    Details
    Publication Date: 2021-06-30
    Description: Mathematical modelling shows that the projection area of the trawl twine influencing its hydrodynamic resistance can be reduced by approx. 30 % through increasing the mesh size of the trawl wings and the conical parts of the trawls, in combi-nation with the use of thinner twine. The interrelation between fuel consumption and projection area of the trawl twine as well as the influence of the enlarged meshes of the wings and first panels on the catch composition can only be measured by trials on fishing boats.
    Description: Johann Heinrich von Thünen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung - Information on Fishery Research in 2010. Johann Heinrich von Thünen-Institut, Institut für Ostseefischerei
    Keywords: Fisheries ; energy-saving ; fishery ; Vessel ; net design
    Repository Name: AquaDocs
    Type: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 43-45
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  • 14
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    Der Haftwasseranteil bei Heringsanlandungen über Bandwaagen (2021)
    In:  bernd.mieske@vti.bund.de | http://aquaticcommons.org/id/eprint/2967 | 1240 | 2011-10-22 12:38:19 | 2967 | Bundesforschungsanstalt für Fischerei
    Details
    Publication Date: 2021-06-30
    Description: In 2004 the fish processing company Euro-Baltic Fischverarbeitungs GmbH Mukran, went into operation on the Isle of Rügen at the Baltic coast of Germany. About 20 % of the herring landed there is discharged from the cutters into the processing plant by pipes, driven by pumps, in case that the landed volume exceeds 10 t fresh weight. In such case the herring is transported in water suspension by means of a pressure-vacuum suction pump system into containers and further transported via conveyer belt to a flowscale. During this process most of the water runs off. It is however unknown how much water remains with the fish and is eventually weighted as fish. To estimate this proportion the mixture of water and fish was stored in special transport containers, which allow the measurement of the run-off. As a result the study shows that on average 2 % of weight measured by the tape scale is water. Along with this factors were determined which influence the variability of the proportion of water.
    Description: Johann Heinrich von Thünen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung - Information Fishery Research in 2010. Johann Heinrich von Thünen-Institut, Institut für Ostseefischerei, Landesforschungsanstalt für Landwirtschaft und Fischerei Mecklenburg-Vorpommern, Institut für Fischerei, Euro-Baltic Fischverarbeitungs GmbH
    Keywords: Fisheries ; Engineering ; Clupea harengus ; Baltic Sea ; technical support
    Repository Name: AquaDocs
    Type: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 23-26
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  • 15
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    Der Anteil Transportwasser bei Heringsanlandungen mittels Vakuumsauganlage in Großraumbehältern (2021)
    In:  bernd.mieske@vti.bund.de | http://aquaticcommons.org/id/eprint/3066 | 1240 | 2011-09-29 17:57:56 | 3066 | Bundesforschungsanstalt für Fischerei
    Details
    Publication Date: 2021-07-01
    Description: Estimation of the water content of herring landings caused by pressure-vacuum double tank pumps and using of multi purpose transport containers About 80 % of herring that is landed in the fish processing company Euro-Baltic Fischverarbeitungs GmbH Mukran, on the Isle of Rügen at the Baltic coast is transported from the cutter into the processing plant by pumping. For this purpose 700 l-Euro-size polyethylene tubs (containers) are filled with herring by means of a pressure-vacuum pump-systems during the unloading of the cutter. To be able to pump the fish from the hold on board it is kept floating in water (transport water). At the end of the pumping/transporting process the fish ends in a dewatering box before reaching the tub, where the transport water is separated from the fish. Then, the not completely dewatered fish is slipped into the transport containers. The amount of transport water reaching the containers depends on the type of PV-equipment and on the amount of transport water in the fish holds of the different cutters. Methodologically the mixture of fish and water must be weighed together. For the experiments specially designed transport container were used which allow the measurement of the run-off of the water to be quantified and thus to measure the proportion of water remaining with the fish. Based on 30 experiments it could be shown that on average 6 % of remaining weight of the mixture is water. Furthermore, factors were detected which influence the variability of the proportion of water.
    Description: Johann Heinrich von Thünen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung = Information on Fishery Research in 2010.
    Keywords: Engineering ; Methodology development ; technical development
    Repository Name: AquaDocs
    Type: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 51-57
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  • 16
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    Alternative Fangmethoden aus der Sicht der Fischereiforschung (2023)
    Details
    Publication Date: 2023-02-24
    Description: Fishing gears are applied in both commercial fishing and fisheries research. In both cases the majority of fishing gear used are trawl nets. However, trawl nets are not suitable for all tasks of fisheries research. On the other hand, tests of alternative gear and methods in fisheries research did not prove satisfoctory. Trawl nets, in particular bottom trawls, in commercial fishery are said to have detrimental effects on the marine environment as well as insufficient selectivity on target and by-catch species. Commercial fisheries trawl nets in use in the Baltic Sea have only little detrimental impact on benthic organisms. Alternative ecosystem-friendly fishing gear such as fish traps are at present unable to replace trawl nets. Options are presented that reduce the negative impacts on the marine environment even further. Changes in trawl nets (big-sized mesh in front of lower panel of semi-pelagic trawls, top reduced trawls) can reduce by-catch. Improvements of ground gear, clump weights and trawl doors can reduce the negative impacts on the sea bed even further.
    Description: Fischfanggeräte werden in der kommerziellen Fischerei und in der Fischereiforschung eingesetzt. In beiden Fällen werden hauptsächlich Schleppnetze verwendet. Schleppnetze sind jedoch nicht für alle Aufgabenstellungen der Fischereiforschung geeignet. Alternative in der Forschung verwendbare Untersuchungsgeräte und Methoden wurden bisher ohne überzeugenden Erfolg getestet. Schleppnetzen – insbesondere den Grundschleppnetzen der Berufsfischerei – werden sowohl die Meeresumwelt schädigende Einflüsse als auch unzureichende selektive Eigenschaften hinsichtlich Ziel- und Beifangarten nachgesagt. Die in der kommerziellen Fischerei der Ostsee verwendeten Schleppnetze üben aber nur einen geringen schädlichen Einfluss auf Bodenorganismen aus. Alternative ökosystemgerechte Fanggeräte wie Fischfallen können Schleppnetze bisher nicht ersetzen. Es werden Möglichkeiten aufgezeigt, die negativen Einflüsse auf die Meeresumwelt noch weiter zu verringern. Durch konstruktive Gestaltung der Schleppnetze (großmaschige Unterblätter im Vornetz, im Oberblatt reduzierte Grundschleppnetze) können Beifänge reduziert werden. Durch weitere Verbesserungen der Beschwerungs- und Spreizelemente an Grundschleppnetzen lassen sich die negativen Einflüsse auf den Meeresboden weiter reduzieren.
    Description: Published
    Description: Non Refereed
    Keywords: Alternative fishing methods ; Commercial fishing ; Trawl nets ; Ground gear ; Trawl doors ; ASFA_2015::F::Fishing methods ; ASFA_2015::F::Fishing gear ; ASFA_2015::B::By-catch
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp.46-50
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