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Optimised codends for an ecologically and economically sustainable brown shrimp fishery in the North Sea (CRANNET)
Project
Project code: TI-SF-08-84
Contract period: 01.01.2013
- 30.04.2015
Purpose of research: Applied research
Brown shrimp fishery in the North Sea is an important economic factor in German coastal areas of Schleswig-Holstein and Lower Saxony, where approx. 200 vessels are involved. As for other fisheries, shrimp fishery is criticized for its temporarily large amount of discards of small shrimp and fish. This discussion is amplified since shrimping is often conducted in the Wadden Sea National Park. Consequently, it is agreed between stakeholders that discards in this fishery have to be reduced.
The aim of this study is to determine the catchability as well as the species- and size-selectivity of different mesh types (T0, T 90, square meshes) and mesh openings in the codend. In addition, modelling of size selectivity will be used to optimize codend selectivity. Hypotheses are that reduced discards will improve stock sizes and lead to even higher catches due to reduced mortality of small brown shrimp. This will be investigated using a population model developed at the University of Hamburg. The economic effects will be scientifically investigated as well. Practical and theoretical experience in selectivity will lead to a suggestion of mesh sizes and types to be used for a sustainable and economical efficient brown shrimp fishery.
Section overview
Subjects
- Marine fisheries