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AIM: What are the main characteristics of fishes and how do jawless fishes,cartilaginous fishes and bony fishes differ ?
OBJ: Given notes and activity sheet SWBAT describe the main characteristics of fishes and how jawless fishes, cartilaginous fishes and bony fishes differ with 70% accuracy.
DN: Introduction to Fish (notes)
ACT: Text, read p. 86 – 92, Work on Fishes Act. Sheetipad – eSpark Assignment
HW: Complete Fishes Act. Sheet; Work on Vertebrate Review Sheets and Animal Activity Sheet. Vertebrate Exam, Dec. 3
Fish Characteristicsectotherms (cold-blooded)
fins (movement)
scales
gills (respiration)
water lifestyle
mostly external fertilization
closed circulatory system
2-chamber heart
oldest & largest vertebrate group
Jawless Fish CharacteristicsNo jaws
No scales
cartilage skeleton
Example: hagfish, lampreys
A Face Only A Mother Could Love
FossilRecord
Cartilaginous Fish Characteristics
jaws
scales
cartilage skeleton
carnivores
Example: sharks, rays, skates
Sharks, Skates, Rays
Bony Fish Characteristicsjaws
scales
bone skeleton
gill pocket with flap
swim bladder (internal gas-filled sac)
most fish (95%) are bony fish.
Example: trout, tuna, goldfish
Deep Marine Anglerfish
More Deep Ocean Anglerfish
Coelacanths are one of the most primitive types of bony fish. Their fossils range from 400 to 60 million years ago.