Some species enter estuaries and even penetrate fresh water for considerable periods, especially during vulnerable stages of their life cycle.

The very young will enter estuaries in South Africa.

Common Seals are known to enter estuaries in pursuit of their prey.

Their depth range is from 0 to 50 m. They often enter estuaries.

They may also enter estuaries and mangroves in search of prey.

This attribute allows threadfins to enter estuaries and even rivers.

They are amphidromous and known to enter estuaries and rivers.

The fish prefers living close to the sea floor at depths of 15 to 40 m, but it sometimes enters estuaries.

The species enters estuaries and may penetrate freshwater rivers, at least as juveniles.

This species inhabits shallow waters close to shore and has been known to enter estuaries.