1. 5/12 - 7th Grade Agenda Learning Objective: Learn about Fish
Collect HW: Reading & Notetaking 219 – 222
Video: Life in the Undergrowth
Textbook Reading 462 – 467
HW: Reading & Notetaking 223 – 226
Reminder: Chap 11 Test on 5/13 & 5/14

2. Reflection
Prompt: Write 3 facts that you know about fish.

3. What type of animal is a vertebrate?
Fish
Sharks
Reptiles
Amphibians
Mammals
Birds

4. What do all Vertebrates share in common?
Backbone
Endoskeleton
Endoskeleton allows an animal to become larger than Exoskeleton. Why?
Skeleton of a Seal

5. One of the most primitive Vertebrate - Lancelet
Notochord: Flexible rod that supports the animal’s back

6. What is Ectotherm vs. Endotherm
Ecto (Outer) + Therm (Heat) = Gets the heat from the outside. Cold blooded
Examples of Ectotherm animals: Fish, Amphibian & Reptiles
Endo (Inner) + Therm (Heat) = Gets the heat from the inside. Warm blooded
Examples of Endotherm animals: Mammals & Birds

7. Fish without jaws - Lampreys

8. Cartilaginous Fishes – Sharks and Rays

9. Bony Fish

10. What are the characteristics of Fishes?
Vertebrate
Live in water
Have Fins
Ectotherm (cold blooded)
Have Scales
Obtain oxygen through gills

11. How does Fish obtain Oxygen?
Fish obtain oxygen in the water through its gills

12. Do Fish break down H2O into Hydrogen and Oxygen?
Fish do not break H2O into hydrogen and oxygen.
There is oxygen gas dissolved in the water.
Their gills extract this oxygen gas out of the water and return CO2 just as our lungs do.
What would happen to the fish if there was no oxygen in the water?

13. Most fishes have external fertilization
In external fertilization, the eggs are fertilized outside the female’s body.
The male hovers close to the female and spreads a cloud of sperm cells over the eggs she releases
There are exceptions – Guppies, Mollies (Live birth)