This is a list of fish species that are found in differents parts of the river Lagan. They don't necessarily appear during the same time of the year or share the same habitat. Most likely there are more species then those listed below. In the brackish water close to the mouth of the river, live several species of saltwater fish.

OBS! Eels are endangered and are not allowed to be fished in Lagan FVO (Fishing Conservation Area)