http://www.bigdawg-dir.com/Aquariums_and_Fish/Fish_Breeds/Pet and Animal Directory consisting of common animals and pets from around the world. Quality links and resources are contained inside the Big Dawg Pet and animal directory.Add your links today and help us grow to be the biggest on the web. fish, limbless aquatic vertebrate animal with fins and internal gills. There are three living classes of fish: the primitive jawless fishes, or Agnatha; the cartilaginous fishes, or Chondrichthyes; and the bony fishes, or Osteichthyes. These groups, although quite different from one another anatomically, have certain common features related to their common evolutionary origins or to their aquatic way of life. Fish were the earliest vertebrates and presumably evolved from a group of aquatic lower chordates the terrestrial vertebrates evolved from fishes. There are over 20,000 living species of fish. They range in size from the .31-in. Paedocypris that lives in tropical swamps in Sumatra to the 45-ft whale shark. Many are brightly colored, and many have shapes and patterns that serve as camouflage. They are found in all marine, fresh, and brackish waters throughout the world and at all depths. Members of different species of fish tolerate water temperatures ranging from freezing to over 100°F; . Most are confined either to saltwater or to freshwater, but some are physiologically adapted to moving from one to the other. A number of fishes that are born in freshwater spend their adult lives in the ocean, returning to their birthplace to spawn; the reverse of this migration occurs in some fishes born in the ocean. Many fishes stay in tightly organized groups, called schools; others are solitary and congregate only for feeding and spawning. Fish may be carnivorous, herbivorous, or omnivorous. Some fish are scavengers on lake or ocean bottoms. Fish are a major source of human food as well as of oil, fertilizer, and feed for domestic animalshttp://www.goldfishcare.orgThis site discusses ways to care for your goldfish. Perhaps you have just bought a goldfish in the sper of the moment and you have no idea on how to care for it, or maybe you know the basics of goldfish care but not much, like how to clean the tank or what foods or plants you can give to your goldfish.Sat, 21 Jul 2007 00:33:48 GMT