If you are into fish keeping, you have probably found out that there is a lot to know about the different kinds of fish available. A very good source for information about the different fish, and also ways of keeping the fish healthy, are books.
Books will give so much information, and usually have very good pictures to help identify the different fish, and or invertebrate animals. Most likely you can find information on breeding, sexing the fish, how big they get, how long they live, and where they come from. Books are very handy to have for fish and invertebrate keepers.