Lesson <ul><li>What is the difference between vertebrates and invertebrates? </li></ul><ul><li>Write one similarity and one difference between amphibians and reptiles </li></ul><ul><li>To what group do the following animals belong: </li></ul><ul><ul><li>Frog </li></ul></ul><ul><ul><li>Cobra </li></ul></ul><ul><ul><li>Salamander </li></ul></ul><ul><ul><li>Crocodile </li></ul></ul>
Topic: Fish Objective: To define the characteristics of the fish
All About Fish Where they live What they eat How they move Is it a fish? How they breathe Their Body
Fish live in water. They can live in oceans, lakes, ponds, and streams. Some fish can be kept as pets in fishbowls and aquariums. Where they live
Fish swing their tail fins back and forth and wave their other fins. They look as if they’re flying through the water. How they move
dorsal fin Lateral line eye spines anus tail fin Ventral fin pectoral fin pelvic fin nostril mouth operculum Their Body
Mouth: takes in food and allows a stream of water over the gills Nostril: a blindly ending sac with organs of smell Operculum: covers and protects gills and lets water escape from them Pectoral and Pelvic Fins: help to steer and stabilize fish Lateral Line: a tube running the length of the body just below the skin Dorsal and Ventral Fins: reduce rolling motion during swimming and help in turning movements Tail Fin: imparts final thrust in swimming movements Eye: it is the fishes point of vision Spines: the primary structural framework upon which the fishes body is built Body plan is: bilateral Their Body
All fish have backbones. Most fish have skin that is covered with scales. A clear slime covers the scales. The anatomy of Lampanyctodes hectoris (1) - operculum (gill cover), (2) - lateral line, (3) - dorsal fin, (4) - fat fin, (5) - caudal peduncle, (6) - caudal fin, (7) - anal fin, (8) - photophores, (9) - pelvic fins (paired), (10) - pectoral fins (paired) Their Body
The scales protect the fish’s skin from cuts and scrapes. The slime protects the fish from germs in the water. The Scales and Slime
Fish open and close their mouths to breathe. Fish need oxygen like us. There is oxygen in the water. They have gills, not lungs. The respiratory system The gill are made up of tiny threadlike filaments. When fish opens the mouth, water rushes in and oxygen is pulled out through the blood vessels. The gills are covered by the operculum. What they eat Body systems
Many fish eat tiny plants and animals. Bigger fish eat worms, small ocean animals, and other fish. Usually, bigger fish eat medium sized fish and medium sized fish eat small fish. The digestive system <ul><ul><li>Fish are carnivores with straight intestines. The plant eaters have coiled intestines. The cartilaginous / primitive fish have spiral valve intestines </li></ul></ul>Esophagus (transports food) Stomach (chemical digestion) Intestine (absorb nutrients) Liver (gives bile) Pancreas (gives enzymes) Pyloric caeca (gives enzymes) Body systems
The closed circulatory system. Heart chambers Blood is pumped from the heart to the gills, where it receives oxygen and gets rid of carbon dioxide. Blood then moves on to the organs of the body, where nutrients, gases, and wastes are exchanged. However, there is no division of the circulation between the respiratory organs and the rest of the body. That is, the blood travels in a circuit which takes blood from heart to gills to organs and back to the heart to start its journey again. 2 chambered heart pumps blood to the gills for gas exchange What they eat Body systems
Fantastic! That’s right! A shark is a fish. It lives in the water. Its skin is covered in scales. It also uses gills for breathing underwater.
Oops, Try Again! Remember, fish have a backbone! An octopus is not a fish. It lives in the water, but it does not have a backbone, scales or gills.
G r o u p s Agnatha Chondrichthyes Osteichthyes Cartilaginous Fish (no bones) Jawless Fish Boney Fish (cartilage and bones) www.muralsforkids.com www.livescience.com
Importance <ul><li>Hcardiac patients </li></ul><ul><li>Food </li></ul><ul><li>Makes veins flexible </li></ul><ul><li>Source of nutrients </li></ul><ul><li>Cleans up the algae </li></ul><ul><li>Completes the food chain </li></ul>Humans Ecosystem I AM NOT A FISH!!