1. Unit 9 Chapter 30 Fishes and Amphibians

2. What is a Fish? Respiration using gills  Blood moves in opposite direction to the flow of water, called counter current exchange Two-chambered heart  Atrium receives blood from body, & ventricle pumps blood to the gills

3. What is a Fish? Paired fins for balance, swimming & steering Scales for covering & protecting body Spawning to produce millions of eggs to ensure a few will survive

4. What is a Fish? Well-developed sense organs: Extremely sensitive sense of smell Lateral line system to detect movement & vibrations

5. Diversity of Fishes Class Agnatha, the jawless fishes Hagfish (scavengers) Lampreys (external parasites)

6. Diversity of Fishes Class Chondrichthyes, the cartilage fishes Skeletons composed entirely of cartilage Include sharks, rays & skates

7. Diversity of Fishes Class Osteichthyes, the bony fishes Includes catfish, perch, salmon, sea horses, lionfish, etc Swim bladder, gas-filled sac that enables fish to control buoyancy

8. What is an Amphibian? Amphibia means “double life” Includes frogs, toads, salamanders & newts Ectotherms, has variable body temperature & gets its heat from external sources

9. What is an Amphibian? Inefficient three- chambered heart Small inefficient lungs; respiration enhanced by “skin-breathing”

10. What is an Amphibian? Metamorphosis:  The larval forms resemble fish (2 chambered heart, fins, gills) Vocal cords, sound-producing tissue in the male’s throat, used as a mating call