Matters of Scale - Factory-Fish Farming

Matters of Scale Image

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Number of different algicides, herbicides, pesticides, and other chemical additives normally fed to farm-raised salmon in 1989
3
Number being used in 2000
26
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Time it takes, in a catfish pond producing 5,000 kilograms of fish per year, to drop 10 tons of waste into the water
1 year
Average period of time a pond is used in raising catfish for human consumption, before draining and refilling with fresh water
6 years
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PCB concentrations found in wild salmon, in a recent study, in pg/g
5,302
PCB concentrations found in farmed salmon
51,216
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Percentage of global production of fish and seafood coming from aquaculture in 1970
3.9
Percentage coming from aquaculture in 2000
27.3
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Estimated amount of beef produced, worldwide, in 2002, in metric tons
49,700,000
Estimated amount of farmed fish produced in 2002
52,700,000
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Sources: Chemical additives: National Warmwater Aquaculture Center, Mississippi State University, and www.animalaid.org.uk; Catfish waste: Craig S. Tucker and John A. Hargreave, "Effluents for Channel Catfish Aquaculture Ponds," Mississippi State University, 1998; PCBs in salmon: Chemosphere, Vol. 46(7), 2002; production percentages: www.fishfarming.com; beef production: USDA; farmed fish production: extrapolated from Fisheries Department, Food and Agriculture Organization of the United Nations.