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 A fish is a cold-blooded, finned aquatic vertebrate. Most fishes are scaled and respire by passing water over their gills. A relatively small number of fishes are scale less and some are able to breathe air directly from the surface of the water. A few highly unusual species can survive for varying periods out of water.
Fish are abundant in the sea and in fresh water, with species being known from mountain streams as well as in the deepest depths of the ocean. Fish are also exploited for recreation, through angling and fish keeping, and are commonly exhibited in public aquaria. Fish have an important role in many cultures through the ages, ranging as widely as deities and religious symbols to subjects of books and popular movies. Fish will not howl at the moon or bark at strange sounds. In holidays fish are a lot easier to manage. Fish are one of the least expensive pets to buy.
Pet fish do not require any further exercise than swimming in their adequately sized aquarium. They will need regular water changes, maintenance and cleaning however. Larger pet fish are generally cheaper to maintain. They can be addictive resulting in the desire to own large expensive fish though.
Once they're settled into their new home, they require minimum maintenance and they are beautiful to watch. They can be an ideal pet if you're away from home a lot or don't have the time for a more high-maintenance animal companion.
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