A5002297628- Marine animal studies overview
- Marine and fisheries research
- Fish Ecology and Management Studies
- Underwater Acoustics Research
- Underwater Vehicles and Communication Systems
- Coral and Marine Ecosystems Studies
- Animal Vocal Communication and Behavior
- Geotechnical Engineering and Underground Structures
- Water Quality Monitoring Technologies
- Ichthyology and Marine Biology
- Advanced Optical Sensing Technologies
Johann Heinrich von Thünen-Institut
2020-2021
The need to minimize bycatch of toothed whales (odontocetes) in gillnets has long been recognized, because they are often top predators and thus essential ecosystem resilience. It is likely that a key achieving this goal the improvement gillnet acoustic visibility, these species use underwater sonar for orientation. Previous work on increasing detectability echolocating animals by making nets more recognizable based trial error, without understanding fundamental properties tested...
Underwater video surveillance is an important data source in marine science, e.g. for behaviour studies. Scientists commonly use water resistant ruggedized monitoring equipment, which cost-intensive and usually limited to visible light. This has two disadvantages: the observation space time where light available or, under artificial illumination, of life potentially biased. Infrared (IR) have been used before overcome these. It records videos at IR-illumination. With today's efficiency...
Abstract Fish pots have lower catch efficiency than gillnets and trawls and, therefore, are rarely used for catching Atlantic cod (Gadus morhua) similar species. Fish-retention devices (FRDs), non-return that permit fish to enter the pot while impeding exit, reduce exit rate therefore can increase catches. Conventional FRDs, however, also entry may not improve To pot-catch efficiency, we developed tested a new trigger-type FRD, made of transparent acrylic glass, which named fingers (AFs)....