Marine experts have given up hope of rescuing 157 false killer whales that stranded on a remote Australian beach.

Australian wildlife officers have made the difficult decision to euthanize 90 false killer whales stranded on a remote beach in Tasmania, after rough ocean conditions made it impossible to refloat them.

Department liaison officer Brendon Clark said the stranding was the first by false killer whales in Tasmania in since 1974. That was a pod of more than 160 whales that landed on a beach near Stanley on the northwest coast. Strandings in Tasmania are usually pilot whales.