12-2 Fishes

Life Science

What is a Fish?

• Fish Characteristics– Fins– Lives in water– Most are ectotherms– Obtain oxygen through gills (from water)– Have scales

Dogfish Fins

Gills

Gills

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Fish Scales

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3 Types of Fishes

1. Jawless Fishes– Hagfish & lampreys

2. Cartilaginous Fishes– Sharks, rays, skates

3. Bony Fishes– 95% of all fish species are bony fishes– Jaws, scales, pockets for gills, skeleton,

swim bladder

Jawless hagfish

Jawless hagfish

Jawless lamprey

Jawless lamprey

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Cartilaginous fishesTiger Shark

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Cartilaginous fishes

Q&A: How do sharks get oxygen?

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Difference between a stingray and skate?

•Skates do not posses venomous barbs•Skates primarily live in marine habitats and rarely enter freshwater environments•Stingrays give birth to live young while skates reproduce by laying eggs in leathery capsules

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Cartilaginous Fishes

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Cartilaginous fishes

Cartilaginous fishes

Bony Fish = 95% of fish

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