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Solutions to mitigate cetacean bycatch have targeted specific fisheries and gears, however, these targeted mechanisms can be effective if interactions occur only between a particular population and gear type or fishery. Most dolphin and whale populations face incidental capture from multiple fisheries and gears. Accordingly, broad-scale spatial approaches to mitigation are needed to address bycatch across multiple species at the scale at which the species occur. This study applied decision-theoretic bio-economic techniques to inform the reduction of cetacean bycatch in a case study of Australian fisheries. Spatial mapping highlighted substantial variation in the location of optimal cost-effective management strategies. Although trawl-net modifications were the cheapest strategy overall, there were many locations where spatial closures were the most cost-effective solution (despite their high costs to fisheries) due to their effectiveness in reducing all fisheries interactions.