fish…our friends in the water
DESCRIPTION
Fish…our friends in the water. Porcupine Fish. Great White Shark. Barreleye. 20,000 species Found in all types of water i.e: Fresh, salt, sunless, polluted, warm, cold, etc. Ectothermic. Characteristics of Fish. Respiration. Respire using gills H 2 O enters mouth. - PowerPoint PPT PresentationTRANSCRIPT
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Fish…our friends in the water
Porcupine Fish
Great White Shark
Barreleye
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Characteristics of Fish• 20,000 species• Found in all types of water• i.e: Fresh, salt, sunless, polluted,
warm, cold, etc.• Ectothermic
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Respiration
• Respire using gills• H2O enters mouth. • Water passes over gills• Water then passes out slits on side of
fish• O2 and CO2 are exchanged through
capillaries (small blood vessels) in gills
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Circulation• Two-chambered heart• 1-chamber received deoxygenated
blood• 2nd-chamber pumps blood to gills. • Oxygen picked up and dispersed to rest
of body• Carbon dioxide is released• Slow process
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Nervous/Reproductive System
• Lateral line---mechanism that detects movements and vibrations.
• Some fish can smell
• Two sexes (male and female)• External fertilization
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3 Classes of Fish
•Jawless (Agnatha)•Cartilaginous (Chondrichthyes)
•Bony (Osteichthyes)
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Jawless Fish• Sharp teeth used to “drill” hole in
animal• Blood sucked out of hole• Endoskeleton made of cartilage• No scales or paired fins
• Examples: Lamprey, hagfish
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Cartilaginous Fish• Endoskeleton made up of cartilage• Skilled predators (typically found near
floor of water source)• Electroreception• Scales
• Examples: Sharks, rays
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Bony Fish• Endoskeleton made up of bones• Lateral line system (pressure change and
swim with no light)• Swim bladder (allows fish to float)• Scales (reduces friction)• Majority of fish
• Examples: Salmon, Trout, Catfish
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