Some freshwater species, when exposed to the air, can gape the shell slightly and gas exchange can take place.

Some freshwater species and almost all terrestric species have developed lungs.

It is a predominantly freshwater species, found in bodies of water inland and occasionally sheltered coastal areas.

The presence of a strictly freshwater species on the Seychelles is hard to explain, biogeographically.

All the mochokids are freshwater species originating from Africa.

The river can have freshwater species in spring and summer like catfish or bass.

It is used mainly for marine and freshwater species.

Most pipefish are marine dwellers; only a few are freshwater species.

Many freshwater species of Synechococcus have also been described.

Lake Barcroft is home to many freshwater species of fish and invertebrate.