As of 2006, the IUCN Red List describes 1,173 species of fish as being threatened with extinction.[44] Included on this list are species such as Atlantic cod,[45] Devil's Hole pupfish,[46] coelacanths,[47] and great white sharks.[48] Because fish live underwater they are much more difficult to study than terrestrial animals and plants, and information about fish populations is often lacking. However, freshwater fish seem particularly threatened because they often live in relatively small areas. For example, the Devil's Hole pupfish occupies only a single 3 m by 6 m pool.[49]

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