Amid claims that current commercial ocean fishing practices are unsustainable because there are no more places left to fish, global demand for seafood nevertheless remains high and the harvesting of wild fish from the oceans is a huge business. There is no argument the industry's massive growth has vastly affected ocean ecosystems, but the extent to which this disruption has depleted and continues to deplete the sea's biodiversity has become source of a heated debate within the world of marine fisheries science. What is the best way to measure the ecological footprint of commercial fishing?