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Bony fish


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bony fish or Osteichyes , by Shew Felix

Published in: Environment

Bony fish

  1. 1. A skeleton of bone Scales Bony operculum covering the gill openings Lungs or a swim bladder
  2. 2. Osteichthyes are primitively ectothermic (cold blooded)
  3. 3. Movement
  4. 4. are taxonomic group of fish that have bone in their skeletons. It is the largest class of vertebrates in existence today.
  5. 5. Actinopterygii the ray-finned fish Sarcopterygii lobe-finned fish
  6. 6. contains fishes that are sometimes called the ray-finned fishes because their fins lack muscular lobes.
  7. 7. They usually possess swim bladders, gas- filled sacs along the dorsal wall of the cavity that regulate buoyancy.
  8. 8. have muscular lobes associated with their fins and usually use lungs in gas exchange.
  9. 9. TYPE OF COELOM: There is a coelom present among all osteichthyes. Each Osteichthyes' coeloms vary slightly, but all have a coelom, which allows them to move more freely through the water.
  10. 10. Musculo-Skeletal Fish move through the water with movements of their tail, here different kinds of fish locomotion are illustrated:
  11. 11. ENDOSKELETON or EXOSKELETON: Osteichthyes have an exoskeleton, meaning they have an external skeleton that helps protect the internal organs. Bony fish differ from the Chondrichthyes because the bony fish have skeletons actually made of bone. Most bony fish have scales, however, some have armor plating, while others such as catfishes lack any kind of covering over the exoskeleton and thus are considered "completely naked".
  12. 12. Fish swim with rhythmic side to side motion of the body or tail Rhythmic contractions produced by bands of muscle called myomeres Locomotion
  13. 13. stomach, intestine, pancreas, liver, pyloric caecae Pyloric caecae – slender tubes that secrete digestive enzymes Plant eaters = long intestine, Meat eaters = short intestines Digestive System:
  14. 14. Filter feeders filter plankton through their gills Tend to be smaller, schooling fish such as herrings, anchovies, and sardines
  15. 15. Top feeder bottom feeder
  16. 16. Fish ‘breathes’ oxygen from the water molecules:
  17. 17. • The gill is supported by cartilaginous or bony structure called gill arch • Gill rakers are used as filters to stop food from entering gills • Gill filaments contain the capillaries
  18. 18. Circulatory System
  19. 19. Lungfish
  20. 20. * Brain & spinal cord * Olfactory sacs or bulbs located on either side of the head and connected to nostrils (smell) * Taste buds located in mouths or barbels * spinal cord, cranial nerves, spinal nerves, sensory organs - Nervous System
  21. 21. - An inner ear is contained in teloests which detects sounds and balance. - A lateral line controls impulse detections and low frequencies. This line contains ciliated nerve cells. - Chemoreceptors are used for sensing smell - Weberian ossicle: in freshwater fish for special acoustic sensory Sensory Organ
  22. 22. The blood of marine fish is less salty than the water, therefore they lose water through osmosis To replace it they must drink seawater Regulating Internal Environment
  23. 23. Reproduction Fertilization is usually external, but can be internal.
  24. 24. Most fish fertilize their eggs externally Spawning - the process of fertilizing eggs (fish reproduction) Fry = baby fish Broadcast Spawning
  25. 25. Development is usually oviparous (egg-laying; depositing eggs that develop and hatch outside the body as a reproductive strategy)
  26. 26. but can be ovoviparity (eggs are retained in the female, but the embryo obtains its nourishment from the egg's yolk)
  27. 27. or viviparous (born alive, as are most mammals, some reptiles, and a few fish (as opposed to being laid as an egg)
  28. 28.  As food,  2. They give by-products.  3. To control diseases.