Lungfish and Gars
Lungfish are thought to be related to early amphibian species. Unlike most fish, they actually have lungs, allowing them to breath air. These fish are hardy, if not comely. They can survive in tanks with little or no aeration.
Gars do not have lungs, but have an incredibly thin, long body shape. They are more difficult to keep than lungfish, but their quick movements and unique predatory behaviors make them attractive to more experience hobbyists.
(source:google/http://webecoist.momtastic.com/)
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