bony fish powerpoint

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  • 1. The Bony FishesClass Osteichthyes

2. Class Osteichthyes The Bony Fish More than 27,000 species Most numerous and successful of allvertebrates Found in every marine habitat tide pools to deep sea Economically important 77 million tons harvested per year 3. General Characteristics Endoskeleton made of true bone Hinged jaws Paired fins independently movable 4. Types of Bony Fishes Lobe-finned Fish: Ancestors of amphibians Ex: coelacanth thought extinct 65 million yearsago found live in 1938 2 species Ex: lungfish lung that can breathe air duringdroughts *Ray-finned: Most present day fish 5. Movement Nektonic swimmers - controlmovement against currentMove to foodEscape predator 6. Movement Streamlining to reduce drag = teardrop shape = fusiform Most fish swim by moving tail side to side Mucus reduces drag Homocercal tail top and bottom same sizeyellowfin tuna 7. Buoyancy Gas-filled swim bladder to maintain positionin water Control quantity of gas Not present in fast moving fish or sharks 8. Gas Exchange Gills covered by operculum Water pumped through mouth, over gills, outgill slits and operculum Thin membranes and high surface area in gills Oxygen diffuses from water into blood Carbon dioxide diffuses from blood to water striped bass 9. Osmoregulation Maintenance of water balance Saltwater fish tend to lose water Drink seawater Excrete salt from gland in gills Produce little urine 10. Osmoregulation 11. Senses To find prey and avoid being eaten Good sense of sight, smell and taste Good sense of hearing inner ear Lateral line system: Line of pores and canals running down body Detect vibrations, changes in current directionand water pressure 12. Outer Covering Mucus reduces friction and preventsinfection Scales protective outer cover Overlap like roof shingles Can tell age of fish 13. Outer Covering 14. Reproduction Separate sexes External fertilization = spawning Female releases eggs Male releases sperm on top 15. Protection Camouflageex: flounder, sea dragon,sargassum fish 16. Armor plating Protectionex: seahorses Sizeex: puffer fish Spinesex: blow fish 17. Protection Countershading - dark on top, light colored onbottom Disappear, ex: flying fish leaps out of water Deceptive markings, ex: butterfly fish 18. Schooling Protection of all species at some point in life Looks like one large individual Confuses predator Hard to catch one fish Easier feeding Easier mating 19. Other Fish Adaptations Angler fish lure to attract prey Deep sea fish bioluminescence 20. Fish Oddities Some start life as male, change to female oropposite ex: some grouper, sea bass,sheepheads, wrasses Ocean sunfish Mola mola - planktonic

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