the collapse of many shark populations in the north atlantic due to overfishing has led to increase in the number of some skates and rays species that were typical prey of sharks such as the great white or the hammerhead this has had significant consequences on fishing communities as the increased number of skates and rays have affected commercial fisheries for bay scallops and other shellfish myers at an international level the world bankfao rent drain study estimates that approximately usd billion is lost annually in global resource rent from fisheries as a result of poor governance world bankfao of course the figures should also be weighed against the costs of undertaking rebuilding programs and subsequent management of the stocks even if a stock is rebuilt fishing may not yield the same level of precollapse revenues as there may be a lag especially for a smaller fishery to reestablish itself and therefore regain access to markets