Compare by-catch numbers against threshold value Photo: - - PowerPoint PPT Presentation

High risk areas Fishing effort By- catch rate

Compare by-catch numbers against threshold value

Photo: Australian Fisheries Management Authority, graph: Kindt-Larsen et al. 2016, artwork: Jaqueline Rothschies

High risk areas Fishing effort By- catch rate

For all relevant metiers 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- risk areas into account (scientific task) Spatial effort data and by-catch positions Calculate by-catch numbers Assessment: Relate to population population size and identity, assessment 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.