What is a Fish?
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Transcript of What is a Fish?
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What is a Fish?
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Classification
• Kingdom- Animalia• Phylum- Chordata• Sub Phylum- Vertebrate• Classes- Jawless, Cartilaginous & Bony Fishes
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Characteristics of Fishes:
1. all Vertebrates2. all live in water3. obtain oxygen
through gills4. have fins5. most are ectotherms6. MOST have scales
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* Laminid- endothermic shark
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Let’s go to the Video!https://www.youtube.com/watch?v=IN7ISLbOhGo
https://www.youtube.com/watch?v=Zoygy-8PTtU barreleye For the first time, a large Pacific barreleye fish - complete with transparent head - has been caught on film by
scientists using remotely operated vehicles at the Monterey Bay Aquarium Research Institute. The deep-sea fish's tubular eyes pivot under a clear dome.
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3 Major Groups of
Fishes
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1. JAWLESS FISHJawless fish: Lampreys, Hagfish
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Types of JAWLESS FISH• Hagfish- Ocean
scavengers, eat dead & decaying bodies
• Lamprey- fresh and salt water, they are parasitic and prey on other fish.
* Both have skeletons made of cartilage and sucker-like mouths.
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Characteristics of Jawless Fish
• NO jaws– instead have mouths
used for scraping, stabbing, and sucking food
• NO scales
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A Sliming Hagfishhttps://www.youtube.com/watch?v=6DlWftios0s
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The Sea Lamprey
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Sea Lamprey Video Clip
https://www.youtube.com/watch?v=-SYhOD1Yx10
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2. Cartilaginous Fish: Sharks, Rays, & Skates
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Charateristics of Cartilaginous Fishes
1.Have Jaws2.Have Scales- pointed & toothlike3.Skeletons made of Cartilage4.MOST have live Birth5.Carnivores
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Sharks, Skates & Rays
• Sharks and Rays- can’t pump water over gills and must keep moving to breathe.
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Skates vs Rays• Skates - egg
laying• Rays- Live
Birth• Skates -
larger dorsal fin
• Rays- Larger than skates
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3. Bony Fishes• Bony Fish:
Salmon, Carp, Tuna
• Over 20,000 different species
• 95% of all fish species
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Characteristics of Bony Fish….
1. Has jaws2. Has scales3. Pocket on each side of head to
hold gills4. Skeleton of Hard Bones5. Swim Bladder 6. Fins
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Swim Bladder• internal balloon-like organ - filled
with gas• helps fish stay stable at different
depths of water using less energy
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Fish Respiration• Water flows over
Gills as fish opens mouth and swims.
• Oxygen diffuses from the water into the blood.
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Up Close and Personal
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Types of Bony FishesRay Finned:
– Most fish are this type– Fins are supported by bony
structures called Rays.
Lobe Finned:– Fins are long, fleshy, muscular,
supported by central core of bones.– Thought to be ancestors of
amphibians.– Examples are: Coelacanth, Lungfish
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Bizarre Bony Fishhttps://www.youtube.com/watch?v=kZuVyPRhFME
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Fish Anatomy
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Fins
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Different Dorsal Fins