Fish are
aquatic vertebrates that are
cold-blooded, covered with
scales, and equipped with two sets of paired
fins and several unpaired fins. Fish are abundant in the sea and in fresh water, with species being known from mountain streams (e.g.,
char and
gudgeon) as well as in the deepest depths of the ocean (e.g.,
gulpers and
anglerfish). They are of tremendous importance as
food for people around the world, either collected from the wild (see
fishing) or farmed in much the same way as cattle or chickens (see
aquaculture). Fish are also exploited for recreation, through
angling and
fishkeeping, and fish 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.
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Fish are vertebrates with gills that live in water. The word may also apply to the
fish as food or to the act of
fishing, either commercially or for
recreation. The fisheries industry also recognises
white fish,
oily fish,
inkfish, and
shellfish, though these are not
taxonomic groups. A variety of animals that are not actually fish have the word as part of their name for
etymological or
commercial reasons, such as
shellfish,
jellyfish,
cuttlefish,
crawfish, and
crayfish.
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