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Fish
arowana
coelacanth
groupers
haddock
herring
ladyfish
leafy sea dragon
lion fish
pelican eel
pencil fish
piranha
salmon
scorpion fish
seahorse
sharks
stingray
sunfish
tarpon
tetra
Fish
There are approximately 25,000 known species of fish, although there could be many thousands more species that have yet to be discovered.
A fish is a vertebrate animal. Nearly all of them are ectothermic, which means 'cold-blooded'.
Fish generally have two sets of paired fins and several unpaired fins. Their bodies are covered with scales, and they need to be able to cope with the pressure of the water around and above them.
Some fish that live in pitch black conditions in very deep water, are able to withstand the immense pressure of the water above them. Some recent research appears to indicate that there are a huge number of species of fish living at these depths!
Stegostoma fasciatum Zebra shark GNU Free Documentation License version 1.2 |
Rhincodon typus whaleshark User:Zac Wolf Creative Commons Attribution-ShareAlike 2.5 Generic |
Megalops atlanticus atlantic tarpon User: Clinton & Charles Robertson Work of the United States Government Image in public domain |
Hippocampus satomiae Satomi's pygmy seahorse Author: John Sear Creative Commons Attribution-Share Alike 3.0 Unported |
 tetra glowligh User: gonzalovalenzuela Creative Commons Licence Attribution 2.0 Generic |
Brachaelurus waddi blind shark User: David_Breneman GNU Free Documentation License version 1.2 |
Ginglymostoma cirratum Nurse shark Source: NOAA image in public domain |
Hippocampus erectus Barbour's Seahorse User:Stevenj GNU Free Documentation License 1.2 |