By- catch Fishing rate effort High risk areas Compare by-catch numbers against threshold value Photo: Australian Fisheries Management Authority, graph: Kindt-Larsen et al. 2016, artwork: Jaqueline Rothschies
By- catch Fishing rate effort High risk For all relevant metiers areas fisheries data needs non-fisheries data needs Monitoring of by-catch By-catch rate per effort (number / km x hrs) Monitoring of effort Fishing effort for all vessels including recreational fishing Identify and take high- Spatial effort data risk areas into account and by-catch positions (scientific task) Calculate by-catch numbers population size and Assessment: Relate to identity, assessment population value (scientific task)
red-throated diver Gavia stellata
common guillemot ( Uria aalge )
black guillemot ( Cepphus grylle )
velvet scoter ( Melanitta fusca )
long-tailed duck ( Clangula hyemalis )
JWGBIRD 2015 Figure 2.2. Survey effort of the first coordinated joint winter survey in winter 2015/2016 in the Baltic Sea and southern North Sea. Most effort refers to aerial surveys, but ship-based surveys were conducted as well.
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