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{{TOC|right}}{{:Fish/Definition}} Fish are abundant in the sea and in fresh water, with species being known from mountain streams (e.g., [[Salvelinus|char]] and [[gudgeon (fish)|gudgeon]]) as well as in the deepest depths of the [[ocean]] (e.g., [[gulper]]s and [[anglerfish]]).

Food prepared from fish is also called [[fish (food)|fish]], and it is an important food source for humans. They are harvested either from [[wild fisheries]] (see [[fishing]]) or [[Fish farm|farmed]] in much the same way as cattle or chickens (see [[aquaculture]]). They are also exploited by [[Recreational fishing|recreational fishers]] and [[Fishkeeping|fishkeepers]], and are exhibited in public [[aquarium|aquaria]]. Fish have had a role in many cultures through the ages, ranging from [[deity|deities]] and religious symbols to the subjects of books and popular [[movies]].

The non-profit Environmental Defense Fund (EDF) has a guide<ref name=EDFfish>[https://seafood.edf.org/ EDF Seafood Selector: Fish Choices that are Good for You and the Oceans] on the Environmental Defense Fund (EDF) website.  Last access 1/21/2024.</ref> to which fish are healthiest (or least safe) to eat, given the state of pollution in today's world, and also which fish are obtained in a way that does not lead towards extinction of the fish.

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