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 digestionTypically J-curvied, elongated, modified to grind, or lostIntestinePyloric caecae – slender blind tubes that secrete digestive enzymesliver secretes bile that breaks down fat
3 Digestive Continued Carnivorous fishes Herbivorous fishes Sharks Short, straight intestinesHerbivorous fishesCoiled intestineSharksSpiral valve – increase surface area for digestion and absorbing nutrients
4 Circulatory System two-chambered heart beneath the gills gas exchange takes place in gillsoxygenated blood is carried through the arteriesCapillaries allow oxygen and nutrients to reach the cellsveins carry deoxygenated blood and carbon dioxide back to the heart
7 Irrigation of gills “irrigate” – water flows over the gills Cartilaginous fishOpen and close the mouthEvery gill is in its own chamber1st pair of gill slits is modified into spiraclesAllow bottom fish to breathe
8 Bony fish Gills on each side share a gill chamber When mouth opens, opercula close, pharynx expands, sucking in waterLamellaeThin plates in rows on gill filament# of lamellae increase with active swimmers
11 Nervous System central nervous system brain and spinal cordnerves connect the central nervous system with all of the organssensory organsEyes – focus moving closer and fartherNictitating membrane – reduce brightness, protect during feedinglateral lines – sense pressure changes, vibrationsnostrils and olfactory sacs – smelltaste buds – mouth, fins, skins, barbelsinner ears – hearing and balance