ies because taxonomic concepts and the extent of knowledge vary (for the latter reason, country totals of species and endemics may be erestimates. In general, numbers of freshwater fish are not as well known compared to other taxonomic groups such as birds and mammals. The world total for the number of known fish species includes marine species. Of this total, around 40-45% are estimated to be freshwater species Viewfulltechnicalnoteson-lineathttp://earthtrends.wri.org/searchabl Total number of threatened freshwater species includes only fish catalogued by the World Conservation Union(IUCN)in their"Red List" publication Figures reported here are in all likelihood smaller than the actual number of threatened species; in many regions of the world, freshwater fish species have not been assessed. Other estimates place the proportion of threatened freshwater fish as high as 20 percent for all countries combined Viewfulltechnicalnoteson-lineathttp:/earthtrends.writora/searchabledb/variablenotesstatic.cfm?varid=140&themeid=7 Sources World Conserbation Monitoring Center(WCMC). April 1997. Unpublished data. Cambridge, U. K: WCMC World Conservation Union(IUCN). 1996. 1996 /UCN Red List of Threatened Animals. Gland, Switzerland IUCN, 1996 Freshwater Seafood Production Freshwater seafood production includes freshwater fish caught in inland waters and in low salinity seas(cyprinids, cichlids, miscellaneous freshwater fishes) reshwater molluscs, freshwater crustaceans, and diadromous fish caught in inland waters. For a more detailed listing of the species mentioned above, pleas refertotheoriginalsourceorFao'sclassificationoffishspeciesonlineathttp://www.fao.org/waicent/faostat/agricult/fishitems-e-e.htmlProductionis expressed in live weight--the nominal weight of the aquatic organisms at the time of capture Data exclude discards Freshwater Fish Catch. Fish catch(capture)is defined by FAo as"the nominal catch of fish, crustaceans and molluscs, the production of other aquatic animals, residues and plants and catches of aquatic mammals, taken for commercial, industrial, recreational and subsistence purposes from marine waters Freshwater capture totals exclude harvest totals from mariculture and aquaculture. Figures are national totals which include fish caught by a country's fleet anywhere in the world Viewfulltechnicalnoteson-lineathttp:learthtrendswriora/searchabledb/ariablenotesstatic.cfm?varid=38&themed=1 Freshwater Aquaculture Production. Aquaculture is defined by FAo as"the farming of aquatic organisms, including fish, molluscs, crustaceans, and ic plants. Farming implies some form of intervention in the rearing process to enhance peoduction, such as regular stocking feeding protection from predators, etc. [It] also implies ownership of the stock being cultivated. "Aquaculture production of freshwater fish includes all freshwater fish cultivated in marine and inland waters, and in freshwater and brackish environments Source Fishery Information, Data and Statistics Unit, Food and Agriculture Organization of the United Nations(FAO). 2002. FISHSTAT Plus: Universal software for fisherystatisticaltimeseriesVersion2.3(availableon-lineathttp://www.fao.org/fv/statist/fisoft/fishplus.asp).AquacultureProductiondatasetRome e EarthTrends 2003. All rights reserved. Fair use is permitted on a limited scale and for educational purposes.countries because taxonomic concepts and the extent of knowledge vary (for the latter reason, country totals of species and endemics may be underestimates). In general, numbers of freshwater fish are not as well known compared to other taxonomic groups such as birds and mammals. The world total for the number of known fish species includes marine species. Of this total, around 40-45% are estimated to be freshwater species. View full technical notes on-line at http://earthtrends.wri.org/searchable_db/variablenotes_static.cfm?varid=139&themeid=7 Total number of threatened freshwater species includes only fish catalogued by the World Conservation Union (IUCN) in their "Red List" publication. Figures reported here are in all likelihood smaller than the actual number of threatened species; in many regions of the world, freshwater fish species have not been assessed. Other estimates place the proportion of threatened freshwater fish as high as 20 percent for all countries combined. View full technical notes on-line at http://earthtrends.wri.org/searchable_db/variablenotes_static.cfm?varid=140&themeid=7 Sources World Conserbation Monitoring Center (WCMC). April 1997. Unpublished data. Cambridge, U.K: WCMC World Conservation Union (IUCN). 1996. 1996 IUCN Red List of Threatened Animals. Gland, Switzerland: IUCN, 1996. Freshwater Seafood Production Freshwater seafood production includes freshwater fish caught in inland waters and in low salinity seas (cyprinids, cichlids, miscellaneous freshwater fishes), freshwater molluscs, freshwater crustaceans, and diadromous fish caught in inland waters. For a more detailed listing of the species mentioned above, please refer to the original source or FAO's classification of fish species, on line at http://www.fao.org/waicent/faostat/agricult/fishitems-e-e.html. Production is expressed in live weight--the nominal weight of the aquatic organisms at the time of capture. Data exclude discards. Freshwater Fish Catch. Fish catch (capture) is defined by FAO as "the nominal catch of fish, crustaceans and molluscs, the production of other aquatic animals, residues and plants and catches of aquatic mammals, taken for commercial, industrial, recreational and subsistence purposes from marine waters." Freshwater capture totals exclude harvest totals from mariculture and aquaculture. Figures are national totals which include fish caught by a country's fleet anywhere in the world. View full technical notes on-line at http://earthtrends.wri.org/searchable_db/variablenotes_static.cfm?varid=38&themeid=1 Freshwater Aquaculture Production. Aquaculture is defined by FAO as "the farming of aquatic organisms, including fish, molluscs, crustaceans, and aquatic plants. Farming implies some form of intervention in the rearing process to enhance peoduction, such as regular stocking, feeding, protection from predators, etc. [It] also implies ownership of the stock being cultivated." Aquaculture production of freshwater fish includes all freshwater fish cultivated in marine and inland waters; and in freshwater and brackish environments. Source Fishery Information, Data and Statistics Unit, Food and Agriculture Organization of the United Nations (FAO). 2002. FISHSTAT Plus: Universal software for fishery statistical time series, Version 2.3 (available on-line at http://www.fao.org/fi/statist/FISOFT/FISHPLUS.asp). Aquaculture Production dataset. Rome: FAO. © EarthTrends 2003. All rights reserved. Fair use is permitted on a limited scale and for educational purposes. page 6