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.