Transcript Slide 1
External Anatomy 2. 1. 3. Label all 6 fins: 1. 2. 3. 4. 5. 6. 4. 5. 6. External Anatomy Operculum Nostril or Nare Eye Scales Mouth Lateral Line Study the external anatomy. Locate the nostrils. Feel the fish’s skin. Use the magnifying glass to view the scales and how they are arranged. Feel their texture. Feel the bony rays that support the fins. How many rays are on the anal fin? ____ External Anatomy Teeth Teeth are found along the upper and lower jaws. They grasp and hold onto prey. Dar Open the trout’s mouth and feel the teeth along the gum margins. Open it as wide as you can without breaking the jaw. Feel the tongue. What are on it? ______ Find the gill rakers from the inside of the mouth that lead to the gills. Gills Gill filaments Gill arch Dar Place the fish on its side and look at the operculum (the bony plates which protect the gills). Lift the operculum to see the gills. Carefully cut the operculum away from its base, exposing the gills. Compare and contrast the trout’s gills with a mammal’s lungs below: _____________________________________________________ _____________________________________________________ _____________________________________________________ Internal Anatomy Swim bladder Dar Heart Liver Gall bladder Spleen Kidney Carefully cut a flap to expose the internal organs using a scalpel or scissors. Cut away the flap of skin and look for fat deposits which are found around the stomach. • Put the fish on its back to find the kidneys located under the backbone. They are thin and dark in color and run the length of the body’s cavity. • Look for the swim bladder. It is made of very thin tissue and is located in the upper body cavity below the kidneys. It may be hard to find. • Look for the liver at the top of the abdominal cavity. Can you find the gall bladder where bile is stored? Digestion Stomach Intestine Pyloric caeca Fat The path of digestion for a trout is: mouth, esophagus, cardiac stomach, pyloric stomach, intestines, anal opening. Why might a fish need 2 stomachs? __________________________________ _______________________________________________________________ _______________________________________________________________ What do you think the purpose of a fish’s intestines are?__________________ _______________________________________________________________ Dar Heart and Gills Gills Dar Heart Compare the location of the heart to the gills. ___________ ______________________________________________ Why is this important? (What is happening in the gills that happens in our lungs?) ______________________________ ______________________________________________