Supplemented roving survey to quantify spatio-temporal recreational fishing effort in an estuarine Ramsar wetland

•Geo-referenced shore-based recreational crabbing activity in a Ramsar wetland.•Diurnal and nocturnal crabbing activity incorporated into probability-based survey.•Supplemented roving survey used thermal camera, laser rangefinder & customized app.•Developed a fine-scale, spatio-temporal footprint for recreational crab fishery.•Spatial fishing effort varied seasonally, assumedly with abundance of legal crabs.