It’s not easy to create an ocean. Technology allows aquafarmers to replicate ocean conditions such as currents, tides, sunlight and moonlight. But getting the balance of all these things, to make seafood forget it’s sitting in big blue tubs on land, is tricky.

“You’ve got to find the right environment to grow them and that’s a challenge," says Paul Steere , chairman of ASX-listed Clean Seas . “You’ve got to make sure you have the right depth, the right type of water, the right temperature of water . . . the salinity. How fast currents might flow or not flow? You’ve got to make sure you have oxygen coming through to the fish," he says.