This is a list of various species of invertebrates, animals without a backbone, that are commonly found in brackish aquariums kept by hobby aquarists.
Some species are intentionally collected for their desirable aesthetic characteristics.
Others are kept to serve a functional role such as consuming algae in the aquarium.
Fiddler Crab, Uca pugnax[1] Perisesarma bidens, Red Clawed Crab Amano Shrimp/Yamato Shrimp, Caridina multidentata Grass Shrimp/Glass Shrimp, Palaemonetes paludosus Blue Crab, Callinectes sapidus Olive Nerite, Vittina usnea[2] Lolliguncula is the only genus of cephalopods that is known to exist in brackish water.
They can tolerate as low as 8.5 PPM of salt.