BIOL 1202 Chapter : Influenza
Document Summary
Fisheries conservation: world commercial fisheries harvests in 2008= 142 million metric tons (mmt) The other 32 mmt comprised of mostly of crustaceans and mollusks (also kelp) About 110 mmt was made up of finfishes. In addition to fresh water and wetland ecosystem services, aquatic ecosystems around the planet provide a huge diversity of fisheries resources. Freshwater and marine recreational fishing important in many countries. Many commercially and recreationally exploited fish and invertebrate stocks (unit of management) declined during the 19th and 20th centuries. Reasons include environmental fluctuations (wind patterns, storm patterns)and overexploitation ex. Alantic halibut and alantic codd- 800,000 tons per a year to nothing b/c of poor fish management ; catching to many fish per year. In addition, many non-exploited aquatic species also declined in abundance from habitat loss and degradation : dams weren"t built to allow fish to pass through. Fisheries are an excellent example of a renewable resource.
