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