but may be a lot harder to implement than might first be though.
some limitation on total catch is necessary if open-access conditions have led to economic and/or biological overfishing. But setting a TAC reasonable accurately requires both biological and economic information that may not be available. this is especially true if, as is normally the case, stocks fluctuate from year to year because of factors not related to fishing pressure. we discuss below some issue related to fisheries management in cases of great uncertainty