Arrrg! Me mateys.
Quote: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 they could find.
http://www.nytimes.com/2011/12/27/sc...sive.html?_r=1We work on almost every animal issue under the sun, a spokesman said by e-mail, but I dont think this is one of them.Still, Dr. Oldfield noted that the average household tank was only one-tenth the size of the smallest tank in the study to yield docile fish. If people kept dogs in these conditions, theyd be put in prison, he said. Its something we should think about.
The study consisted of two experiments conducted side by side. In one, Dr. Oldfield tested the effects of overcrowding by keeping tank size constant while increasing the number of fish. In the other, he tested environment by placing three fish in consistently larger and more complex tanks. He then recorded their behavior at least two hours after feeding, to eliminate competitive behaviors related to food.
While aggression seemed to remain constant regardless of the number of fish in a tank, Dr. Oldfield observed that it dropped off considerably once the fish were placed in a 100-gallon tank with several plants and rocks to form alcoves.
The findings confirmed what he found when observing Midas cichlids in the wild. If you go out and observe these fish swimming in a river, he said, theyre not aggressive at all, really.