Your mission should you choose to accept it, is to go into one of Australia’s largest harbours and count the fish. Think this sounds daunting? You don’t know the half of it.

First, there’s the water. There’s a lot of it in Darwin Harbour – five times more than Sydney Harbour, to be precise. Heavy tides swell more than seven metres then retract, leaving little visibility in their wake.

And if you think you’ve got some occupational hazards at work, try getting your job done in an environment teeming with some of the world’s most intimidating apex predators – saltwater crocodiles, along with tiger, bull and hammerhead sharks. More than 300 salties are caught in the harbour each year.

This is the daunting task of the Department of Primary Industry and Resources for the Northern Territory Government, as it goes about ensuring fisheries resources are sustainably managed and developed for future generations.