Northern Pike, previously believed to be restricted to freshwater, are now using brackish estuarine pathways to invade new habitats where salmon had previously been the top-level predator.

Northern pike are moving through salt water to invade freshwater habitats in Southcentral Alaska, according to a recent study published in the journal PLOS ONE. Researchers at the University of ...

They can swim fast and are very good at hunting other fish. A pike is a freshwater fish that lives in lakes and rivers. Pike mainly hunt fish and frogs but will sometimes eat small mammals and birds.