Presentation on theme: "Fish: Form and function An LSU Museum of Natural Science presentation to accompany the activity."— Presentation transcript:
Fish: Form and function An LSU Museum of Natural Science presentation to accompany the activity
Types and Function of fins All Fish have fins! Each fin shape has a unique shape and function. Dorsal- (top fin) Helps keep the fish upright. Also used for sudden direction changes. Pectoral- These are the pair of side fins that help the fish move in different directions and aids in the ability to swim and steer. Sometimes have spines used for defense. Dorsal fin Pectoral fin
Pelvic- Located on the bottom of the fish. Most often used as “brakes”. Anal- used to stabilize fish Additional fins: Adipose- tiny fin between dorsal and caudel fins Pelvic fin Anal fin Types and Function of fins
Caudel (Tail) fin This fin is used to propel the fish through the water, pick up speed, and make turns. Rounded caudal fin –allows for effective acceleration and maneuvering but in general is found on fish that do not swim long distances because of large amounts of drag Truncated caudal fin – straight tipped tail; allows for quick turns and short burst of speed Emarginated caudal fin – has the least amount of drag; fin has two lobes Forked caudal fin- 2 lobes, helps reduce turbulance Lunate caudal fin- tend to be fastest fishes, maintain speeds
Body shapes of Fish Sagitiform – elongated tubular body layout that is arrow shaped; allows fish to strike quickly. (Example: gar, barracuda) Depression – wide, flat body shapes that all fish to rest on the bottom. (Example: flounder)
Body shapes of Fish Fusiform: streamlined with pointed ends - shaped like a plane; helps to lower frictional resistance, and allows them to move through the water extremely fast. Compressiform – fish that are laterally compressed; tall, thin body shape that allows fish to enter vertical crevices; allows for quick bursts of speed and quick turns.
Anguilliform – fish that are long and skinny; these fish slither like snakes; allows them to maneuver into narrow openings and resist the force of current. Globiform – these fish are almost round or globe-shaped. Body shapes of Fish Taeniform – thin ribbon like shape; good for hiding in crevices and cracks.
Lateral line Pelvic fin Pectoral fin Anal fin Caudal 2nd dorsal fin 1st dorsal fin Eye Operculum Mouth Nostril
Gyotaku Japanese art of fish printing How it works: 1.Paint plastic fish 2.Press painted fish onto paper to make impression. Label parts if desired.
Build you own ‘Franken’fish Materials: Fish part templates Glue Crayons Construction paper Scissors Pencil and paper Purpose: Students will learn about fish anatomy and morphology by building their own fish.
On-line Resources Fish anatomy print-out Enchanted learning- s/fish/label/labelfish.shtml s/fish/label/labelfish.shtml Basic information on fish grams.htm Gyotaku fish