The captive reproduction of fish and invertebrates is one of the most rewarding and important projects you can explore. Such undertakings can be quite simple or extremely complex, depending upon the species chosen. In all cases, observing the courtship and breeding behavior of your pets and raising the young will be a learning experience. Faced with rapidly dwindling habitats and the loss of species, it is vital to reduce pressure on wild populations by learning to breed more species in captivity.