A5040321283- Marine and fisheries research
- Fish Ecology and Management Studies
- Marine Bivalve and Aquaculture Studies
- Coral and Marine Ecosystems Studies
- Food Industry and Aquatic Biology
- Aquaculture Nutrition and Growth
- Gear and Bearing Dynamics Analysis
- European and International Law Studies
- Regional Development and Management Studies
- Coastal and Marine Management
- Genetic and phenotypic traits in livestock
- Marine Ecology and Invasive Species
- Research in Social Sciences
- Arctic and Russian Policy Studies
- Oceanographic and Atmospheric Processes
- Biomedical Text Mining and Ontologies
- Mechanical Engineering and Vibrations Research
- Crustacean biology and ecology
- Offshore Engineering and Technologies
- Marine animal studies overview
- Underwater Vehicles and Communication Systems
- Ichthyology and Marine Biology
- Water Quality Monitoring Technologies
- Fish Biology and Ecology Studies
- Methane Hydrates and Related Phenomena
Technical University of Denmark
2014-2024
Swedish University of Agricultural Sciences
2020
National Aquatic Resources Research and Development Agency
2015-2017
Danish Centre for Marine Research
2016
Aquatic Systems (United States)
2012
Abstract To reduce the practice of discarding commercially fished organisms, several measures such as a discard ban and extra allowances on top landings quotas (“catch quota”) have been proposed by European Commission. However, for their development successful implementation, an understanding patterns scale is needed. In this study, we present inter-national synthesis data collected board commercial, towed-gear equipped vessels operating under six different national flags spanning from...
Discards represent one of the most important issues within current commercial fishing. It occurs for a range reasons and is influenced by an even more complex array factors. We address this issue examining data collected Danish discard observer program describe factors that influence discarding Kattegat demersal fleet over period 1997 to 2008. Generalised additive models were used assess how discards 3 main target species, Norway lobster, cod plaice, their subcomponents (under minimum...
Abstract Danish seining is an important fishing method used to harvest demersal species. Knowledge about the size selectivity of different species with this type gear therefore importance for managing exploitation marine resources. However, there are only limited data on selection in cod ends fishery. Sea trials were carried out collect Atlantic Cod Gadus morhua , Haddock Melanogrammus aeglefinus and Witch Flounder Glyptocephalus cynoglossus a diamond‐mesh end. For all three species, best...
Abstract Discards refer to the part of catch not retained on board during commercial fishing operations, but returned sea. The proposed European Union Common Fisheries Policy reform, be implemented in 2014, sets out a gradual elimination discards by reducing unwanted catches and ensuring that all are landed. To develop successful discard mitigation measures, it is necessary identify reasons for discarding. Here, we have developed simple model can applied data from observer programmes (ObsPs)...
Abstract Global efforts to reduce unwanted catches have led the development of a vast array by‐catch reduction devices (BRDs), in particular for mixed trawl fisheries. Some these BRDs could likely benefit from being combined. However, number possible combinations would be prohibitive tested experimentally. Therefore, this study we propose meta‐analytical approach that combines data available on independently fishery and predict theoretical selectivity all those devices. This allows identify...
The efficiency of escape panels inserted in trawls relies on fish actively attempting to through them. However, several studies indicate that most drift towards the aft end trawl, passing panel which they easily could have escaped, without making contact with it. To increase such panels, probability needs be improved. In this study, we investigate what extent can improved by stimulating behaviour fish. performance two identical sections was compared a twin-trawl system, one and stimulation...
There is a need to improve fishing methods select for certain sizes and species while excluding others. Experiments are conducted quantify selectivity of gears how variables such as gear design (e.g., mesh size, shape), environmental parameters light, turbidity, substrate) or biological fish condition) alter selectivity; the resulting data be analyzed using specialized statistical in many cases. Here, we present new tool analyzing this type data: an R package named “selfisher”. It allows...
When evaluating fishing gear catches, the focus is often on a few species as opposed to entire catch. In some fisheries this can lead ignoring major part of catch composition. Thus, there need for more holistic approach when ecological impact using specific and comparing two or gears. context, it relevant have method that describes total quantifies proportions being wanted unwanted. study, we outline such demonstrate its applicability data from small-scale coastal gillnet fishery targeting...
The proportion of Atlantic cod (Gadus morhua) discarded in the Danish Baltic Sea trawl fishery has been as high 40%. This, combined with a stock that declined dramatically over past 30 years, led to numerous technical regulations being introduced reduce capture juveniles and thus discards. One method widely adopted improve gear selectivity, subsequently allowing young individuals escape capture. To understand effects changes selectivity minimum landing size have had on discard rates, well...
FLEXSELECT is a simple counter-herding device that aims at reducing the bycatch of fish by scaring them away from trawl path without affecting catches target species. was tested in Norway lobster (Nephrops norvegicus) directed fishery, as this includes both roundfish and flatfish. Length-based data were collected for Nephrops, four species (cod (Gadus morhua), haddock (Melanogrammus aeglefinus), whiting (Merlangius merlangus), hake (Merluccius merluccius)), two flatfish (plaice (Pleuronectes...
Abstract There are numerous examples from across Europe where collaborative science‐industry initiatives, which provide a bottom‐up approach to trawl gear development, have been successful in developing selective gears. For fishers, the creates sense of ownership and control over gears developed often greater desire for them achieve their objectives. Despite many benefits lack clarity transparency, incorrect incentives, unclear communication, distrust or diverging perceptions can inhibit...
Reducing discards of unwanted sizes and species which have a low survival rate is one the major challenges in fisheries worldwide today. Numerous devices fishing gears aiming at improving both size selectivity been developed implemented by various fisheries. Selective are often collaboration between scientists fishers. Part development controlled scientific test documenting effect. In this study, we compared two versions mandatory escape panel that were introduced into mixed fishery...
Diamond-mesh codends are the most commonly used in demersal trawls. However, mesh geometry tends to vary these during fishing, which leads a less well-defined size selection process. This leaves one questioning rationality of regulating exploitation patterns based on when and (or) variation between hauls is highly variable. While it has been speculated theoretically investigated how much variability may contribute selection, remained be quantified experimentally. Therefore, we conducted...
Escape panels are one of the bycatch reduction devices most used in trawl fisheries but their efficiency rely on fish actively contacting panel to escape. To investigate if contact behaviour changes at different placements, we tested a 300 mm square mesh placed upper codend 3, 4 and 7 m from codline. Seven competing models probability were fitted empirical data. Based results, inferred that placement significantly affects escape due change type behaviour. Cod ( Gadus morhua) showed...
The European Common Fisheries Policy has in its 2013 reform increased complexity, such as a call for coherence with the Marine Strategy Framework Directive and landing obligation, posing new requirements challenges to managers, scientists fishing industry. Therefore, re-evaluations of current practice are important basis management actions. Swedish fishery Norway lobster (Nephrops norvegicus) Kattegat–Skagerrak area provides an interesting case study relevance emerging policies. Sprung from...
In demersal trawl fisheries, the unavailability of catch information until end catching process is a drawback, leading to seabed impacts, bycatches and reducing economic performance fisheries. The emergence in-trawl cameras observe catches in real-time can provide such information. This data needs be processed determine compositions rates, eventually improving sustainability this study, underwater video processing system counting Nephrops individuals entering has been developed using object...
There is general pressure throughout the world's fisheries for industry to have greater involvement not only in development of fishing gears but also testing and documentation their effect. In European Union, Common Fisheries Policy 2013, together with proposed reform technical measures regulation, highlights need flexibility through increased stakeholder involvement. To achieve this flexibility, there a additional available fishermen. A way facilitate take part gears, as well collect data...