How to Keep and Breed Tropical Fish

Although this is not a book in which the various aquarium species will be de-
scribed in detail, it seems a good place to outline the main families
which are of importance to the aquarist and to mention some of their
features. There are hundreds of families of fishes, and their exact
definition varies with the authority,but those used in small aquarium
number only a few dozen, and a mere eight or ten of them contain
nearly all the common aquarium species.
All these families belong to the grou...