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Minimum size is a common management regulation in noble crayfish (Astacusastacus) fisheries. The most used catching method baited traps, catch crayfishdown to 50 mm total length (TL). In Norway the minimum size is 95 mm TL and thisregulation allow female crayfish to spawn a least once before being harvested. To reducethe fraction of non-legal sized crayfish in trap catches, mesh-size were increased from17.5 to 21 mm (knot to knot) in Lake Steinsfjorden (1983) and nationwide (2001). Wecompared catch per unit effort data in traps with different mesh sizes from the two mostimportant noble crayfish fisheries in Norway to evaluate the effects of the regulation.Traps with mesh size 21 mm catch significantly fewer crayfish compared to traps with 17.5mm and 12 mm. As intended, traps with 21 mm caught significantly less non-legal sizedcrayfish compared to 17.5 mm. Increased mesh size thus reduce the catch-induced mortalityof non-legal sized crayfish, resulting in a larger spawning population. Mesh sizeregulations is an important management tool, especially for recruitment limited crayfishpopulation, and is rather easy to enforce compared to minimum size

Effect of mesh size on baited trap catch composition for noble crayfish (Astacus Astacus)