A rebound in populations of the fish shows capitalist self-interest and regulation can work together, says David Fickling for Bloomberg Opinion. SYDNEY: In a world that often seems to be teetering on the edge of chaos, what hope is there for defenceless fish? The Atlantic cod off the eastern coast of Canada were once such an abundant resource that their dried flesh helped drive the colonisation of the Americas, spawning local delicacies from Spanish bacalao to Jamaican ackee and saltfish.