What makes us

fishes?

Do Now – Reading Check1. What structure in humans serves the same

function as gills in fish?

2. What is the function of the lateral line in fish?

3. What are 3 of the 6 characteristics that make a fish a fish?

Do Now Answers1. Lungs

2. Pick up vibrations in water to make fish more aware of their surroundings

3. Cold-Blooded, Breath using Gills, have fins and scales, have a slime coat, have a lateral line, fish are aquatic.

What are Fish – Quick Review

They have gills – they allow fish to remove O2 from water.Fish have Scales and Fins

Scales can be used to determine the age of fishFish have a Lateral Line

Used to feel vibrations in water to make them more aware of their surroundings

Fish create mucous Reduces friction in water and protects them from parasites and

disease.Fish have a Swim Bladder

They help fish regulate their depth in waterFish are Cold-Blooded

Body temperature is controlled by their environment

Basic Fish Anatomy - External

Basic Fish Anatomy - Internal

Breakdown of Bony FishesActinopterygii – Ray-finned Fishes

Sarcopterygii – Lobe-finned Fishes

Sarcopterygii: Lobe-finnedMembers of this class of fish were the ancestors of

amphibians and other land animals.

Their swim bladder functions for both buoyancy AND can function as lungs, also use pneumatic sacs to function as lungs

Teeth often present and have true enamel

Fins have homologous structures to modern day terrestrial animal limbs. Bones and muscles move out into the fins.

Coelocanths

Sarcopterygii : Lobe-Finned

Australian Lungfish

Actinopterygii: Ray-finned FishesThere are 3 grades of Actinopterygii, the

most abundant are TeleostsTeleosts make up 96% of all living fish

Swim bladder moved away from any function for respiration, used only for buoyancy.

Fins are flexible, controlled by muscles in body, fins are supported by spines rather than bones

Actinopterygii: Ray-finned Fish