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The CRANNET Project: Which Mesh Is Most Profitable for Brown Shrimp Trawling?

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  • Beam trawling on brown shrimp (Crangon crangon) is one of the most important fisheries for the German fleet. It is an open fishery without a defined quota. Indicators such as increased by-catch, a predominance of undersized shrimp in catches, and a high fishing mortality all suggest that improved gear selectivity could have positive economic impacts. In the CRANNET project we tested a range of codend mesh sizes and shapes to derive selection curves, which were subsequently implemented within a population model. The results were combined with typical revenues to determine the most profitable mesh. A considerable decrease in by-catch was observed with all tested codends of larger mesh size, while the marketable catch component was reduced only slightly. The effect of shrimp escapement on the population and thus on future catch was estimated with a population model. This cohort based yield-per-recruit model simulates the population based upon seasonal and size-specific growth and mortality rates. In combination with selectivity curves and market prices we estimated the effect of alternate mesh on catches and revenues both immediately following introduction and at a later, balanced state. The mesh size that is commonly used at present was predicted to yield the lowest catches and revenues, while any increase in mesh size resulted in a considerable increase in catch and revenue. However, this result would only apply if larger mesh sizes were employed throughout the entire brown shrimp fleet. Aside from replacing codends, which have a short lifespan anyway, the measure is considered to be cost-neutral.
  • Proceedings of the Eighteenth Biennial Conference of the International Institute of Fisheries Economics and Trade, held July 11-15, 2016 at Aberdeen Exhibition and Conference Center (AECC), Aberdeen, Scotland, UK.
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  • Challenging New Frontiers in the Global Seafood Sector: Proceedings of the Eighteenth Biennial Conference of the International Institute of Fisheries Economics and Trade, July 11-15, 2016. Compiled by Stefani J. Evers and Ann L. Shriver. International Institute of Fisheries Economics and Trade (IIFET), Corvallis, 2016.
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  • 0976343290

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