Stuff is reporting that a supposedly destroyed batch of marron (Cherax tenuimanus) at a fish farm in Warkworth, New Zealand may not have been 100% eradicated. The farm was closed down over a decade ago after the Department of Conservation noted the potential of the Aussie crayfish to escape into native waters. Now people are finding marron in the West Auckland area, and officials are thinking the crayfish somehow got out before the farm was closed down. Local kiwis may want to read this press release as well - it includes a phone number to call if you spot any marrons in your path. Both stories also mention the recent discovery of the gudgeon fish (Gobio gobio) in the same area.