A staggering one third of the world’s protein comes from fish. But 11 of the 15 world’s major fishing grounds are seriously depleted. With no slackening in the pace at which the seas are being over-fished, increasingly inland freshwater fisheries are taking up the slack. But they depend on a reliable supply of water. The sixth programme in the Changing Currents season looks at measures underway to sustain the boom in fish farming.
Films in this series