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Longitudinal dimension of the messed fish measured at the end of the Caudal peduncle; therefore excludes the caudal fin.

In the field of aquarophilia, the term "size" can have several meanings.

First, the size of an aquarium can be defined by its capacity in liters. It is important to choose an aquarium of the right size according to the species of fish you want to maintain there. Fish need space to move around and hide, and too small an aquarium can cause health and behavior problems. In addition, an too small aquarium can be more difficult to maintain, because it can get dirty more quickly and require more frequent water changes.

Fish size can also be an important factor to take into account when buying an aquarium. Certain species of fish can reach imposing sizes and therefore require a larger aquarium. It is important to find out about the adult size of the fish you want to keep in your aquarium to make sure you have enough space for them.

The size of aquatic plants can also be a factor to take into account when creating an aquarium. Some plants can be larger than others and therefore require more space to develop. It is important to choose plants that are suitable for the size of your aquarium and leave enough space for their growth.

Finally, the size of the accessories and equipment of the aquarium must also be taken into account. For example, it is important to choose a pump and an aquarium filter adapted to the size of your aquarium in order to maintain good water quality. Likewise, decorations and toys for fish must be adapted to the size of your aquarium and your fish so as not to hinder their movement or well-being.

In summary, size is an important factor to take into account in the field of aquarophilia and can concern the aquarium itself, the fish and the plants you maintain there, as well as the equipment and the accessories used. It is important to choose elements adapted to the size of your aquarium in order to guarantee the well-being and health of your fish and maintain good water quality.