VOLUNTEERS searching for stressed fish in the Murray River, where oxygen levels have hit critical levels, are calling on residents to remain on the lookout for struggling native fish.
Rescue efforts in recent weeks have resulted in more than 600 freshwater crayfish and native fish being removed from river between Swan Hill and Robinvale-Euston.
But fish continue to be found dead along the river, prompting concerns about what effect blackwater is having on fish populations heading into the next fishing season.