Prussian carp, from which goldfish were domesticated, are traditionally a dull, gray-green hue. But mutations and breeding over the years created goldfish' signature orange, red, and yellow pigments found in the over a hundred varieties of the fish today. 

Goldfish go from cute to villainous when released into the wild. They’re known to carry disease and parasites, as well as breed with wild carp in the area. Between 3,000 and 4,000 goldfish were discovered in a lake near Boulder, Colorado, in 2015, and researchers have even found large goldfish in Lake Tahoe.

An adaptable, intelligent fish Goldfish are a hardy aquatic species. They can deal with temperature fluctuations, changes in pH, cloudy water, and even low dissolved oxygen levels.

If released into the wild, goldfish can group up into what’s called a school. But they don’t need companions to be happy in captivity and are fine if kept separately in a tank. 

The fish’s size is usually constrained by the size of its tank. But with enough food, proper water temperatures, and ample room to roam, goldfish can balloon. 

Commercial fishermen on the Great Lakes have started making a profit from the invasive species. The almost 90,000 pounds of goldfish caught in Michigan in 2015 brought in nearly $70,000 in revenue. .

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