The lying catfish (Synodontis nigriventris) is a species of fish in the order Siluriformes. They are adapted to spend most of their time floating or swimming on their backs. The pigmentation of its belly is darker than that of its back. It is native to the Congo River Basin in Africa.

Natural fish from the upper basin of the Madeira River, in Bolivia and Brazil. It usually lives in marginal areas of the river, in meanders and lakes with a substrate of sand or mud. The base coloration is silvery and sandy tones. They have a semi-diffuse black vertical stripe at eye level.

Hypostomus plecostomus is a well-known aquarium fish of the order Siluriformes, native to South America. It can be found from Costa Rica to Argentina. Colloquially, it is known as seaweed sucker, glass cleaner fish, devil fish or cat fish. It is a fish that swims in rivers and streams.

The goldfish, also known as three tails, gold carp or gold carp, is the domestic version of the Chinese river carp, a species of freshwater fish in the family Cyprinidae. It began to be bred in captivity about 2000 years ago, being one of the oldest domestic fish species.

Discus fish (Symphysodon) is a genus of fish in the cichlid family. It is native to the lower areas of the Amazon River and its tributaries, in slow waters without strong currents, with vegetation that it uses as a refuge since it is very skittish. It belongs to the family of cichlids of South American origin.

This variety of clowns starts with the orange part of the nose and the rest of the black body, when it grows the whole body ends up completely black. Anemones are marine animals that normally adhere to the substrate, sometimes on the sand at the bottom, sometimes on the rocks.