These calls have been motivated by concerns that some forms of support may complicate sustainable fisheries resources management by promoting overcapacity and overfishing. This was motived by the view that often commercial fisheries are exploited, potentially exploited by more than one nation, either because fishermen from more than one country operate in the same area or because the fish migrate from one jurisdiction to another. As a result, fisheries subsidies may not have just an impact on trade, but an additional effect of hindering a trading partner’s ability to produce fish products if one country subsidises its fisheries to the extent that the resource is diminished.