Characiformes

A few common species include the common carp, goldfish, zebrafish, including the first genetically modified glowfish, rosy barb, common loach, fathead minnow, and koi, which are actually colored varieties of the amur carp.

Next, order Characiformes is an order of ray-finned fish that includes a diverse group of species known for their vibrant colors and active behavior.

These fish are predominantly found in freshwater habitats of South America and Africa.

Characiformes encompass popular aquarium species like tetras, piranhas, and hatchetfish, known for their stunning appearance and schooling behavior.

And finally, members of order Gymnotiformes are commonly known as Neotropical knifefish or South American knifefish.

They are easily recognized by their elongated bodies and anal fin, and are known for their unique ability to generate weak electric fields for communication, navigation, and hunting.