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Chordates and Fish

Chordates and Fish. Members of the ANIMAL KINGDOM and the PHYLUM CHORDATA They have a dorsal, hollow nerve cord and a notocord. What is a chordate?. pharyngeal pouches (become gills) Tail - extends beyond anus Most chordates are vertebrates (SUBPHYLUM VERTEBRATA). Chordates have.

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Chordates and Fish

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  1. Chordates and Fish

  2. Members of the ANIMAL KINGDOM • and the PHYLUM CHORDATA • They have a dorsal, hollow nerve cord • and a notocord What is a chordate?

  3. pharyngeal pouches (become gills) • Tail - extends beyond anus • Most chordates are vertebrates (SUBPHYLUM VERTEBRATA) Chordates have

  4. Chordates that are NOT vertebrates: Sea Squirts or Tunicates

  5. Lancelet

  6. Chordate Anatomy

  7. ---Animals with a backbone or vertebral column (endoskeleton) ----Have spinal cord - dorsal, hollow nerve cord ----Front end of spinal cord develops a brain What is a vertebrate?

  8. Jawless Fish (lamprey, hagfish) • Cartilage Fish (sharks, rays…) • Bony Fish (salmon, catfish, goldfish…) • Amphibians (frogs, salamanders…) • Reptiles (lizards, turtles…) • Birds (sparrows, hawks…) • Mammals (humans, whales, cats..) Vertebrate Classes

  9. * Anything with gills, scales, and fins… • 1st Fish were jawless • Devonian Period - "Age of Fishes“ Fossil of a devonian fish with jaws and armored plates Stethacanthus Tribute Video What are Fish?

  10. Circulation- 1 Atrium and 1 Ventricle Form & Function

  11. Fish have a two chambered heart – blood is passed over the gills where it picks up oxygen

  12. Water passes over GILLS, oxygen is added • Some fish have gill covers – OPERCULUM • Some fish have special organs to serve as lungs (Lungfish) Respiration

  13. Homeostasis: maintaining water balance • Salt water fish tend to lose water • Fresh water fish tend to gain water • *This is why you can’t put a salt water fish in a fresh water tank • *The salmon can do both Excretion

  14. Response- Cerebrum - thinking, voluntary activities- Cerebellum - coordination- Medulla Oblongata - functions of internal organs - Lateral Line System - senses vibrations The Nervous System

  15. Fish fins help stabilize the fish and propel it forward Swim Bladder – maintains buoyancy (like a balloon) Other Fish Adaptations

  16. Spawning – fish lay eggs that are fertilized externally • Some fish bear live young • Oviparous (lays eggs) • Ovoviviparous (eggs stay in mom) • Viviparous (babies get nourishment from mom. Ex. Humans, cats, some fish) Reproduction

  17. Salmon Video at National Geographic

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