It has long been known that the upwelling areas in the oceans are rich and that large fish populations live there. The annual catch of anchoveta off Peru of about 8 million (M) tons grew very sharply and there are still enough fish to support the birds. Much of the world's coastline in subtropical seas is in upwelling areas; here fish live in profusion, belying the myth of tropical deserts in the sea. This paper is an attempt to estimate the potential yield from the upwelling areas of the world.
