Fisheries Economic aspects 21 Fishes 20 Research 15 History 13 Agriculture 12 Fish trade 12 Periodicals 12 Congresses 11 Fishing 11 Fishery management 9 Statistics 8 Environmental aspects 6 Forests and forestry 6 Marine biology 6 Fishery law and legislation 5 Oceanography 5 Aquaculture 4 Big game fishing 4 Directories 4 Economic conditions 4 Equipment and supplies 4 Fish culture 4 Fishers 4 Trawls and trawling 4 Fish-culture 3 Fishing boats 3 Freshwater biology 3 Marine resources 3 Pollution 3