Animal Studies Lab

 Introduction Fish are aquatic animals. Their water sources are oceans, seas, rivers, lakes, ponds, and streams. They provide advantages to the human in many ways. Fish are the source of food for many people in this world and help to maintain balance in aquatic ecosystems. Fishes such as tuna and salmon are popular nutritious fish. Fish are the biggest group of vertebrate creatures on Earth, with a population of over 34,000 species. They help us to understand marine life in better ways.  There are three main types of fish:  Jawless Fish, cartilaginous fish, and bony fish.  To learn more about unique animal adaptations, read our article on why the zebra has black and white stripes. Jawless fish: One of the earliest and most basic fish species is the jawless fish. Lampreys and hagfish are the only populations of fish without jaws that are still alive. The sea lamprey and river lamprey are the two most commonly found species of lamprey. A lamprey's tongue is designed ...