Clownfish is a fish from the child of the Amphiprioninae tribe in Pomacentridae tribe. There are twenty-eight commonly recognized species, one of which is the genus Premnas, while the rest belong to the genus Amphiprion. Yellowfish, orange, reddish or blackish.

I love clown fish because the clown fish reminds me of Nemo from the Finding Nemo movie. Nemo is a jolly and energetic clown fish. He has a curious nature with everything he sees and is also very friendly to whomever he meets.

Nemo belongs to the species Amphiprion ocellaris or commonly known as Ocellaris clownfish. This species can grow up to 11 cm.The body is oval in orange to brown, can also be black in some areas. The specie has three vertical white lines that are outlined with fine black lines. The first line is slightly behind his eyes. The second one, is in the middle and widened to his head. The third, encircling the tail fin. The fins are also broken down with fine black lines.

Clown fish live in warm waters on coral reefs with a depth of less than 50 meters and clear water. With distribution areas in the Pacific Ocean (Fiji), Red Sea, Indian Ocean (Indonesia, Malaysia, Thailand, Maldives, Burma), and Great Barrier Reef Australia.

Clownfish are omnivorous fish, so in addition to the small invertebrates (crustaceans & parasites attached to the anemone body), algae are also known to meet 20-25% of their nutritional needs.

Clown fish coexist with Anemon, the sea animal of Anthozoa class that glance looks like a plant. Clown fish and anemones live in mutual benefit. Anemones will protect clown fish and clown fish will ward off the butterfly fish (Butterfly Fish) who like to eat anemones. Clownfish will also eat small invertebrates attached to the anemone tentacles that harm the anemone (parasite) and help clean the anemones from the dirt like sand, etc. On the other hand dirt from clown fish provide nutrition for anemone.

Because of its relatively small size, clown fish have many predators. Predator of clown fish, including eel, barracuda, and grouper fish. When there are predators who want to prey on clown fish, the clown fish will quickly hide among the tentacles of anemone for protection. Toxic tentacles of anemone will intercept and kill the predator.

Without protection from anemones, clown fish can survive only a few minutes before being eaten by their enemies. Life together between two kinds of creatures that are much different is often used as an example of harmony of living neighbors.

Anemones have a toxic sting that can only be retained by clown fish. The mechanism can occur because the mucus layer in clown fish (based on sugar). When for the first time approached the sea anemone, the clown fish carefully touched its tail to the anemone tentacle and then pulled it quickly. After touching repeatedly for about an hour, an anemone mucus layer has moved to a clownfish. After that, when an anemone is touched by a clownfish, its tentacles are not stimulated to sting. If the clown fish are separated from the anemone for several hours, they will soon lose their immunity. And to become immune again they need to adapt and need time as mentioned above.

Clownfish will defend desperately anemones where they live, clown fish never deviate farther than 30 cm / more than their host for the rest of their lives.

All the clown fishes are of male sex when they are born. After they mature, the dominant individual will turn into a female. Females are usually larger than males and will be the chief leaders of their territory.

Clownfish live in small groups in an anemone consisting of a couple of mothers, some young male fish, and some saplings that are also male. When females die, the dominant male fish will turn genitals into females and will search for male partners, this strategy is known as sequential hermaphroditism (sequential sex change).

During the spawning season (around full moon), the eggs are placed on relatively flat surfaces near their anemones. Clownfish can produce 300-700 eggs of eggs. Both mains keep the eggs and fan their eggs with fresh water for 6 to 10 days. Usually hatching occurs at night, approximately 2 hours after sunset.

After hatching, baby clown fish will rise to the surface and live by eating plankton. Once large enough, the clown fish will descend from the surface and look for suitable host anemones. In the host anemon, they will follow the existing stages of hierarchy.