Fisheries Ships 118 Fishery management 51 Economic aspects 48 Fishery law and legislation 43 Wildlife conservation 41 Research 38 Fishes 35 History 33 Aquaculture 29 Law and legislation 24 Conservation of natural resources 23 Marine resources conservation 23 International trade 22 Budget 20 Fishers 20 Governmental investigations 20 Licenses 20 Armored vessels 17 Expenditures, Public 17 Claims 16 Fishery policy 16 Salmon 16 Treaties 16 Environmental aspects 15 General 15 Tariff 15 Fish trade 14 Interstate agreements 14 Taxation 14