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According to global species database 33,100 species of fish had been described by April 2005. That is more than the combined total of all over vertebrate species; mammals, amphibians, reptiles and birds in which Pisces can be classified into three classes: placodermii, chondrichthyes, ostiechthyes. Chondrichthyes then subdivided into actinopterigii and sarcopterigii. Depending upon the habitats and the characteristics there are a variety of fish available on the world. Fresh water, tropical, marine, cold water and aquarium fish are the major types of fishes. I hope the readers will find it very informative and enjoyable. The success of any work is never limited to the individual who is dedicated for the work. Most often, it is a collective effort of my friends that reflect in the success. I take this opportunity to thank my friends and family members for the completion of this work. It gives me a great pleasure to express my thanks to chairman, secretary, correspondent and principal of Pocker Sahib Memorial Orphanage College, Tirurangadi, Malappuram District, Kerala for their valuable guidance, support and encouragement. I would like to express my sincere gratitude to my teachers for their kind help for the preparation of this book in better way. Lastly but not the least I thank to God who gave strength and patience to complete my work successfully.