There
are around 25,000 different species of fish, with hundreds of new
species being discovered every year. Most fish have scales, but some do
not. Some are brilliantly colored
others blend
in with the muddy sea bottom or the plants they live amongst, and
certain fish can even change their colors to match their changing
environment. There are even fish that can glow.
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Among the most fascinating classes of fish are the cartilaginous fish, or
Chondrichthyes, including sharks and rays.
