List of brackish aquarium invertebrate species

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. Some species are present only incidentally or are pest species.

Crustaceans
Fiddler Crab, Uca pugnax

Perisesarma bidens, Red Clawed Crab

Amano Shrimp/Yamato Shrimp, Caridina multidentata

Grass Shrimp/Glass Shrimp, Palaemonetes paludosus

Blue Crab, Callinectes sapidus

Gastropods
Olive Nerite, Vittina usnea ==Cephalopods == 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.
 * Subgenus Loliopsis
 * Dart squid, Lolliguncula diomedea
 * Subgenus Lolliguncula
 * Argus brief squid or Argus thumbstall squid, Lolliguncula argus
 * Atlantic brief squid or Atlantic thumbstall squid, Lolliguncula brevis
 * Panama brief squid or Panama thumbstall squid, Lolliguncula panamensis