To breed tropical fishes, set aside a breeding tank, then choose the best parents from both sexes, and settle the pair in optimal conditions. Be sure to add hiding places in the breeding tank or aquarium like aquatic plants, rocks, or some toy structures like castles. Always prepare high quality food for the breeders and as much as possible, simulate the breeding season in their natural habitat.

Breeding tropical fishes can be taxing but fulfilling at the same time. For beginners, sexing, or verifying the sex of the fishes is quite a challenge. Fishes can be categorized as either sexually dimorphic or isomorphic, which means that the sex of some species can readily be recognized physically (dimorphic) or not (isomorphic).

Males are generally larger, more vibrantly-colored, and have more intricate fins while females are somewhat rounder in the abdominal area. The angel fish and some species of catfish are very hard to sexually distinguish but some like the bettas and cichlids are rather easy, making the latter two highly recommended for novices.

All fishes do not have vocal chords but they can communicate by grunting, hissing, or even moaning. Unlike most animals, fishes have taste buds located all over their body. However, similar to many animals, they can drown if the water does not have sufficient oxygen.