Depletion of ocean
For centuries, humanity's need for fish products was supplied
by capture fisheries from the abundance of oceans, lakes and rivers,
reaching in the 1970ís some 120 million tons per year. Ocean productivity
Than, about 40 years ago, ocean productivity began declining, having reached
Maximum Sustainable Yield. Recent studies, widely reported in the
general and scientific press, clearly show the emergence of a catastrophe,
the Tragedy of the Oceans.
During the last 50 years, the global spread of commercial fishing, use of
sonar and satellites combined with 30 km nets, and reckless fishing
practices, have cut by 90% the oceans population of edible fish, from the
Blue Marlin fish to staples like cod, Halibut and Tuna. With todayís fishing
practices, it would take only 15 years to remove 80-90% of any species that
becomes the focus of the fleetís attention, bringing it to the verge of
In 2000 and later years, ocean capture fisheries declined to about 92
million tons annually. Countries that used to be self-sufficient and exporters of
seafood products, are presently net importers.
Meanwhile, World demand for seafood is sky rocketing everywhere. In
developed countries due to increase in standard of living and the awareness
to health benefits, as well as in less-developed countries, whose population
keeps growing. Seafood everywhere is in high demand, and consumer prices
The only way to bridge the gap between reduced capture fisheries output and
increased World demand is through aquaculture and fish farming.