This is not absolute but it will give you a fair estimate as to what your catch should weigh per limit. The skinny 7 inch fish will weigh between 6 and 7 lbs, heavy bodied perch in the 7 inch size and the 8 inch skinny perch will weight about 8 lbs per limit. Full bodied 9 inch or a limit of skinny 10 inch perch. will weigh between 9 and 10 lbs.