Some freshwater species ( and the blacktip shark, a marine species ) are hardy enough or survive better in brackish water, such as " Polypterus bichir ", certain gobies.
2.
""'Polypterus bichir lapradei " "'is a subspecies of freshwater fish in the family Polypteridae . " P . bichir lapradei " are demersal, primitive, and popular with experienced aquarists.
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