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All About Fish
3 years ago
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All About Fish
#ngscience.com #fish #animals A fun video with all the facts you need to know about fish. Head to NGScience.com for a range of related resources, worksheets and interactives. Fish are cold-blooded animals that live in water. Cold-blooded means their body temperature is not regulated and varies with the temperature of the environment. Fish range in size from just a few millimeters to several meters. Most fish reproduce sexually by external fertilization whereby eggs and sperms are released into and fertilized in the water. There are three main groups of fish – jawless fish, cartilaginous fish and bony fish. Jawless fish are the oldest and simplest group of fish that include lampreys and hagfish. They do not have jaws and feed by sucking their food. They have long cylindrical bodies and a skeleton made of cartilage. Cartilaginous fish include sharks, rays and skates. They have an internal skeleton made of cartilage. Cartilage is strong and flexible. It provides support and protection and enables many cartilaginous fish to grow larger than other types of fish. Bony fish have an internal skeleton made of bone. They include many of the fish you are most familiar with including salmon, tuna and swordfish. Sea dragons and eels are also bony fish. The body of fish is well-adapted to life in water. They have a streamlined shape, fins and a tail that allows them to move about and change direction easily. Bony fish usually have a body covered in scales which also helps them glide through water. Scales also provide protection. Fish have a specialized respiratory system with gills. As water flows over the gills, they take in oxygen which passes into the bloodstream.
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