In just 50 years the global spread of industrial-scale commercial fishing has cut by 90 percent the
"In just 50 years the global spread of industrial-scale commercial fishing has cut by 90 percent the oceans' population of large predatory fishes, from majestic giants like blue marlin to staples like cod, a new study has found (see Nature, www.nature.com - Nature 423, 280 - 283 (15 May 2003) Letters to Nature)
Source: Revkin, Andrew, The New York Times, 5/15/03, A1.