fish osteichthy bony fish 20,000 species big →little species all aquatic habitats cold blooded...
TRANSCRIPT
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FISH
• Osteichthy• Bony fish• 20,000 species• Big →Little species• All aquatic habitats• Cold blooded• Scales and mucus• Gills
• Chondrichthy• Cartilage fish• 1,000 species• Same• Same• Same• Same• Same
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Hydrolagus colleiChimaera
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Fish
• Osteichthy• Cannot close eye• External
Fertilization• External
Development
• Chondrichthy• Some have eyelids• INTERNAL
fertilization• Development
SOMETIMES External
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Fish
• Osteichthy• Caudal Fin =
Homocercal• Swim Bladder = YES• Neutrally Buoyant• 1 Row of teeth• Teeth permanent• Scales grow back
• Chondrichthy• Caudal Fin =
HETEROcercal• Swim Bladder = NO• Negatively Buoyant• Many rows of teeth• Teeth replaceable• Scales do NOT grow
back
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Battle against Negative Buoyancy• Cartilage is lighter than Bone (negatively
buoyant but LESS sinking).
• Body shape helps give them “lift”.
• Caudal fin Heterocercal
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Battle against Negative Buoyancy
• #1 Caudal fin Heterocercal
• #2 Pectoral fins like?????
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Battle against Negative Buoyancy• #1 Caudal fin Heterocercal
• #2 Pectoral fins like?????
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Battle against Negative Buoyancy• #1 Caudal fin Heterocercal
• #2 Pectoral fins like Airplane wings
• #3 Liver is 25% of body weight
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Battle against Negative Buoyancy
• SO….
• Cartilage is lighter than Bone +• Caudal fin Heterocercal +
• Pectoral fins like Airplane wings +• Liver is 25% of body weight =
Neutral Buoyancy?????
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Chondrichthys are
NEGATIVELY BUOYANT
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Carcharias taurus
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Hearing
• 0.5 miles away. (10 football fields)
• Hear struggling animals.
• Better than humans
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Smell
• 1 drop in 25 gallons or 1 ppm.
• Openings to nose can locate exact direction of scent.
• Better than humans
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Lateral Line
• Allows them to “feel” movements.
• Better than humans
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Vision
• Eyes very important.• Some sharks can cover their eyes while
attacking food, with a Nictitating Membrane.• Great white shark can roll eye back into head for
protection.• Sharks vision 10X better than a cat in darkness.
• Better than humans
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Ampullae of Lorenzini
• Detect electromagnetic impulses.
• Living organisms give off electromagnetic signals.
• Heart beating, muscle twitching, etc
• Better than humans
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SEX
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Chondrichthyes
• Internal Fertilization
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Courtship (may the best male win!)
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Chondrichthyes• Development ( a bit more tricky!)
• 3 different ways:
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Oviparous
• Shark lays eggs in the water and leaves.
• No parental care.
• No added parental nourishment or protection.
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Viviparous
• Female gives birth to live young.
• Baby sharks are attached to mother by placenta (nourishment)
• Advantage—greater protection (pre-birth)
• If babies are larger, then less babies.
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Ovoviviparous
• Babies are in egg cases, but eggs are carried by mother.
• No added nourishment given.
• Advantage: added protection from external eggs.
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Carcharias taurus
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(Survival of the Fittest)
Intrauterine Cannabilism
Or
Oophagy
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SHARKATTACKS
450 species total
447 chocolate labs
3 pit bulls
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Annually, between 100 Million and 200 Million sharks are
killed worldwide just for their Fins.
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