Bony Fish

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Bony Fish Osteicthyes
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Closed circulation with 2 chambered heart
( 1 atrium and 1 ventricle ) Coldblooded/
ectothermic - cannot regulate their
temperature
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• Fish have a 2 chambered heart
• Heart Gills
• Body
• a low pressure system
• slow flow

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COUNTER CURRENT RULES when exchange of gases or
heat is needed
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• Reproduction -
• dioecious,
• external fertilization,
• eggs are soft and must be laid in water
• to prevent drying out,
• 100s of eggs/ individual are laid

Salmon spawning
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Male salmon
Eggs with milt ( sperm)
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Fry or fingerlings baby fish
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Scales tell a story
Good times Tough times