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Chapt 10 bony fishes


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Chapt 10 bony fishes

  1. 1. Chapt 10 Bony FishesIchthyology“the study of fish”
  2. 2. Phylum Chordata• Class Actinopterygii– “modern bony fish”– 25,000 species or ½ of all vertebrate species– So diverse no one characteristic can differentiatethem from sharks, skates, and rays (cartilaginousfish)• Taxonomy of fishes is concentrated on order or familyrather than phylum or class (b/c phylum is too broad)– Taxonomy of fishes are still changing as newtechnology and research reveal new characteristics
  3. 3. Phylum Chordata• Class Actinopterygii– Characteristics• Presence of swim bladder: gas filledsac; add and remove to adjustbuoyancy• Bones• Bony scales• Fin rays
  4. 4. Coelacanths “primitive fish”• Historic fish that give rise to modern day amphibians• Were thought to be extinct 65 million years ago untilliving specimens were discovered in 1938 and astime goes on finding more and more individuals“living fossils”• Live at depths 150-250 meters• Bony skeleton but vertebrae is almost all cartilage(like sharks)• Maintain high amount of urea to maintainhomeostasis• Reproduction: ovoviviparous
  5. 5. Ray-finned Fishes• Most numerous and diverse of ALL vertebratesin ocean• Characteristic-fins attached to body by fin ray– Webs of skin connected by bony plates
  6. 6. 2 major groups• Subclass Chondrostei– Heterocercal tail– Skeleton made mostly ofcartilage– Ganoid scales– Atlantic Sturgeon• Subclass Neopterygii– Successful b/c bodieslighter; jaws stronger– Homocercal tails• Backbone does notextend into tail– Cycloid OR Ctenoidscales• Both are thinner andmore flexible than ganoidscales– Salmon; seahorses
  7. 7. Body Shapes-determined by habitat• Fusiform (torpedo)-streamlined shape foractive swimmers• Laterally compressed-flattened so canmaneuver though corals• Flattened: bottom-dwellers• snakelike: burrowingfish
  8. 8. Respiration• Gills: receive oxygen andremove CO2, and maintainsalt balance– Made of gill filaments: bloodflows in opposite direction ofincoming H2O• Water must continuouslypass over gills– Meets with blood with lowerO2 and higher CO2• Diffusion moves from where towhere?????– Fish actually “pump” H2Oover gills
  9. 9. Cardiovascular• Close circulatory system: Heart, veins, arteries– Most complex we’ve seen so far!– 4 chambered heart• Draw Heart diagram in your notes
  10. 10. Nervous System• Brain, spinal cord, nerves• Senses– Olfaction: sense of smell: olfactory pits(nostrils)– Taste: receptors on head, jaws, tongue,mouth and barbels on some fish(catfish)– Eyes Lack eyelids• Most set on sides of face: each eye seeown independent view.
  11. 11. Reproduction• Vast: species specific– Change Sex– Female to Male: Blue headedwrasse can change sex ; alsoform Harems– Male to Female: Moray Eels– Seahorses: males carry eggs– French Angelfish: mate for life:Monogamous– Perch: Spawners separatesexes: No parental care foryoungPolygyny Harem13352685556ed59ahttp://i11.p
  12. 12. Coloration- Write in your notes these examples and how they benefitspecies