At Amity Point, where the beach shoals quickly, and the fish often swim too far out to be surrounded by the men without going out of their depth, the blacks had managed to make friends with the grey porpoises so that the latter assisted in the business. On a signal being made from the beach by beating the water with a spear, the porpoises would swim shorewards driving the fish before them, and help to form the surrounding circle. The co-operative principle was so well understood between these fellow-adventurers, that an unsuccessful porpoise would swim backward and forwards along the beach, until a friend from the shore waded out with a fish for him a on the end of a spear. The porpoises were regarded with affection and never injured in any way ; offence would be taken at any proposal to hurt one, and it is said the blacks even professed to claim individual ones as their own. I have seen a flock of pelicans and a school of porpoises join forces and fish together in a similar way.

Royal Society of Queensland, 1891. Notes On The Aboriginals Of Stradbroke And Moreton Islands By George Watkins. Originally published in Proceedings of the Royal Society of Queensland, Vol. 8, part 2, 1890-91, pages 40-50.