Visual Encyclopedia


Fish are the gill-bearing aquatic craniate animals that lack limbs with digits. They form a sister group to the tunicates, together forming the olfactores. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Tetrapods emerged within lobe-finned fishes, so cladistically they are fish as well. However, traditionally fish are rendered paraphyletic by excluding the tetrapods (i.e., the amphibians, reptiles, birds and mammals which all descended from within the same ancestry). Because in this manner the term "fish" is defined negatively as a paraphyletic group, it is not considered a formal taxonomic grouping in systematic biology. The traditional term pisces (also ichthyes) is considered a , but not a phylogenetic classification.

The description above is licensed from Wikipedia under the Creative Commons license.

Add an image or video to this topic

No signin required




Best posts about this topic

Loading . . .


Rosetail Half-Moon Betta Fish

This is so pretty!

Contributed by Darby Oliver

Yellow Boxfish

Hmmm…. I wonder why its called that!

Contributed by Darby Oliver

Bubble-Eye Goldfish

A cute goldfish with puffed cheeks making their eyes "bubble".

Contributed by Darby Oliver


School of fish form a sphere!

Contributed by Darby Oliver

Translucent Goby Fish

A fish that is completely clear. You can see all of its organs!

Contributed by Darby Oliver

Pretty scary stuff!

Thankfully this guy is hanging out at extreme ocean depths!

Contributed by Josh Milligan

Prehistoric looking shark!

Not sure I want to play in the ocean anymore!

Contributed by Josh Milligan

River Monsters

a fish that has pig features

Contributed by Sade Izundu

Creative way to teach your fish to play.. I guess o.O

Contributed by Johanna L Garcia

Weedy Scorpionfish

Contributed by Jessica Kalmazu Stimely

What is Sussle?

Sussle is the first, open visual encyclopedia. Anyone can use it.

What's a visual encylopedia?

It has beautiful images and viral videos that are way more fun than reading all the text in traditional encyclopedias.

5 reasons you should add your own images and videos:

  1. If you found Sussle interesting, then give back by adding something interesting for others.
  2. Help others learn in a fun way.
  3. Make someone else interested in this topic laugh or say wow!
  4. Become internet-famous as people like and share your post.
  5. It's super easy, so it won't take more than a minute.

Ready to start?

Just click on the red module above.