Fish in Small Tanks Are Shown to Be Much More Aggressive

New York Times: Tropical fish hobbyists will tell you their tanks are a source of relaxation, but recent research suggests the fish might disagree. Nearly 13 million American households contain a fish tank, and the average tank size is less than 10 gallons. Yet a study comparing the behavior of common freshwater fish in a variety of habitats found that those kept in such small tanks were considerably more aggressive than those in larger ones — more likely to fight, flare their gills and guard whatever tiny alcoves......

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