Animal Wallpaper > Fish Pictures - Sea and Ocean Fish Pictures Gallery Colorful fish pictures gallery with beautiful fish desktop wallpaper images. Digital design of fishes, poisonous and tropical fish pictures, fish reef and more underwater pictures.            Beautiful fish Colorful fish wallpaper Digital fish cartoon            Fish wallpaper Nemo cartoon fish Poisonous fish            Red fish wallpaper Tropical fish wallpaper Two fishes picture            Under sea fishes collage Underwater fish reef Weird fish picture Fish Marine Description: There are approximately 31,000 known species of fish, the most numerous class of aquatic vertebrates. The whale shark is the largest fish in the world, it measures about 16 feet at maturity while at birth can reach 60 inches. Also, they can live even 100 years. Most fish need to take in oxygen from the water but there are species that can breathe atmospheric oxygen, some use their mouth to breathe while others do it by using the skin or digestive system. Fish is the symbol of Christianity, the sign is being used since ancient times by Christians to recognize each other. Fish Internet Resources: FishBase online