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Fish Internal Anatomy and Physiology

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Presentation on theme: "Fish Internal Anatomy and Physiology"— Presentation transcript:

1 Fish Internal Anatomy and Physiology
Objectives: Describe the function of major organ systems in bony fish and list the specific organs in each system.

2 Digestive System food enters mouth through esophagus
into the stomach for digestion Typically J-curvied, elongated, modified to grind, or lost Intestine Pyloric caecae – slender blind tubes that secrete digestive enzymes liver secretes bile that breaks down fat

3 Digestive Continued Carnivorous fishes Herbivorous fishes Sharks
Short, straight intestines Herbivorous fishes Coiled intestine Sharks Spiral valve – increase surface area for digestion and absorbing nutrients

4 Circulatory System two-chambered heart beneath the gills
gas exchange takes place in gills oxygenated blood is carried through the arteries Capillaries allow oxygen and nutrients to reach the cells veins carry deoxygenated blood and carbon dioxide back to the heart


6 Respiratory System

7 Irrigation of gills “irrigate” – water flows over the gills
Cartilaginous fish Open and close the mouth Every gill is in its own chamber 1st pair of gill slits is modified into spiracles Allow bottom fish to breathe

8 Bony fish Gills on each side share a gill chamber
When mouth opens, opercula close, pharynx expands, sucking in water Lamellae Thin plates in rows on gill filament # of lamellae increase with active swimmers

9 Respiratory System (Gills)


11 Nervous System central nervous system
brain and spinal cord nerves connect the central nervous system with all of the organs sensory organs Eyes – focus moving closer and farther Nictitating membrane – reduce brightness, protect during feeding lateral lines – sense pressure changes, vibrations nostrils and olfactory sacs – smell taste buds – mouth, fins, skins, barbels inner ears – hearing and balance


13 Special Organ Swim bladder Controls buoyancy
Inflates as the fish moves up Deflates as it move deeper Absorbs or releases gas into the bloodstream

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