Length-frequency data approaches to evaluate snapper and grouper fisheries in the Java Sea, Indonesia

•Overview of the snapper and grouper fishery in the Java Sea.•Spawning Potential Ratio estimates for the four most abundant species.•Differences were observed related to the type of gear used.•Longline fishery presented good stock status indicators for all species studied.•Bias in Linf and M/K parameters have a stronger influence on the indicators values than Lmat.