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.  Read More