The Environment Protection Authority has confirmed it is investigating after a disturbing number of dead fish washed up on beaches in Newcastle earlier this week.
On Tuesday about 50 dead fish were found on the tide line across a 1.4 kilometer stretch between Merewether and Bar beaches.
According to the EPA the fish were small in size and 95% were from just two species.
While investigations are only just beginning, the Authority says it has found no evidence of water pollution or algae at this stage.