chordates and fish. chordates 45,000 members must have the following dorsal nerve chord –...
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Chordates and Fish
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Chordates
• 45,000 members
Must have the following• dorsal nerve chord – vertebrae• cranium – skull• endoskeleton of bone or
cartilage
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7 CLASSES of VERTEBRAE
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1. Mammalia
• hair, milk young
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2. Aves
• birds : feathers, hollow bones
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3. Reptilia
• dry scaly skin
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4. Amphibia
• permeable skin
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And 3 that are FISH!
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5. Agnatha
• jawless fish • lampreys and hagfish• round mouth• long eel like bodies• gills evolved to…
Lamprey video
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6. Chondrichthyes
• (kahn-Drick-theeez) • sharks, skates and rays• jaws and paired fins• cartilage skeleton• unique placoid scales
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7. Osteichthyes
• (Ahs-tee-Ich-theeez) • bony fish : salmon, bass, etc.• jaws• skeleton of bone• lobe (mud) or ray finned
Largest Bony Fish
Longest Bony fish
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Adaptations to live and Survive in Water
• trap gas = buoyancy• Trap in organ called gas
bladder/swim bladder• regulates depth with O2, CO2 and N2
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Adaptations…
• streamline shape
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Adaptations…
• muscular tail : Caudal fin
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Adaptations…
• paired fins : 2 dorsal and 2 pelvic
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Adaptations…
• mucus = less friction
Other escape adaptations
Puffer fish
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Adaptations…
• gills : gas exchange O2 in and CO2 out
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Adaptations…
• lateral line system :
nerves for sensing
vibrations in water
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Adaptations…
• Separate sexes • internal and external
fertilization • spawning
Fish fighting