Aquarium Tank: refrigerator chills the water , air pump provides oxygen & current, only gravel and rocks to provide protection, fish food, no natural predators, limited space to swim, manmade habitat, In the Wild: Snowmelt, rain water, and ground water provides cold, clean water, rapids and churning water provide oxygen, insects, algae, and plankton, gravel, rocks, bubble curtain, sticks, shady riverbank provides cover, predators: bears, snakes, birds, other fish, humans, freedom to feed and swim in larger areas, natural environment of creek, river or lake,

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