Crayfish not ‘extinct’ 24/05/2023 FacebookTwitterEmail Dr Sylvia Zukowski releases a Freshwater Crayfish back into the Murray River on May 16. Photo by Nick Whiterod Freshwater crayfish are no longer extinct in the River Murray thanks to the work of senior aquatic ecologists, Dr Nick […] Subscribe or Login to see the rest of the content. Username Password Remember Me Forgot Password