Red-breasted mergansers are sawbill ducks breeding along Scottish and northern English rivers. Their welfare depends on clean rivers with abundant fish and undisturbed nesting sites.
Red-breasted merganser welfare is primarily threatened by illegal persecution from fishing interests who consider them competitors for game fish. Research consistently shows mergansers take primarily small, non-game fish that do not compete significantly with angling. Illegal shooting and nest destruction violate legal protections that exist for good reason. Maintaining clean, fish-rich rivers through catchment management supports both merganser welfare and the anglers who share rivers with them.