Fish drashkov kardjaliev valcheva 10 6
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Fish drashkov kardjaliev valcheva 10 6






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Fish drashkov kardjaliev valcheva 10 6 Fish drashkov kardjaliev valcheva 10 6 Presentation Transcript

  • Toma Drashkov Robert Kardjaliev Neda Valcheva 10/6 Fish
  • Circulation
    • Oxygen poor blood from sinus venosus
    • Atrium
    • Ventricle
    • Oxygen poor from conus arteriosus to get oxidized by gills and then goes to the rest of the body
  • Digestion
    • Food is broken first in esophagus
    • In stomach the pyloric caeca secretes enzymes, absorbs nutrients
    • The cycle ends in the intestines
  • Movement
    • Muscles, Fins, Skeleton
    • S movement
    • Very aerodynamic form
    • Liquid secreted to minimize drag
  • Interesting
    • Fish have a vision as good as ours
    • Have ears, cannot hear very well
    • Sense gentle currents, vibrations, movement
    • Some (shark, catfish) detect low electric Currents
    • Some (electric eel) produce electric current
  • Main Groups
    • Not a single clade, but 3 main groups
    • Agnatha - j awless primitive fish
    • Chondrichthyes – jawed fish; cartilaginous skeletons
    • Osteichthyes - bony fish; fish with bony skeletons
  • Symmetry
    • Some fish have bilateral symmetry
    • However, not all – they come in all shapes and sizes as can be seen in (a) and (b)
  • General Things About Fishes
    • Live underwater in both fresh and salt water
    • Free swimming or laying on the bottom of the sea
    • Not a single clade; 3 main groups
    • Their way of breathing is different from that of other species due to their living underwater
    • They come in a plethora of shapes and sizes
    • Have different ways of reproducing
  • Agnatha
    • Petromyzon marinus or sea lampreys live in the Great Lakes in North America
    • Live for 10 years and feed off from the blood and tissue of teleost fishes
    • Eggs-> blind & toothless larvae-> live burried in mud, filter-feeding->metamorphosize into adults and turn into their parasitic form -> spawn 60-70 thousand eggs-> die
  • Chondrichyes
    • The Great White Shark, Carcharodon carcharias , can be found in coastal surface area in all oceans
    • Live 30-100 years long
    • Largest predatory fish – up to 6 meters long
    • No natural enemies other than humans
    • Not much known about their life cycle except that they give birth to 2-14 baby sharks and migrate often
  • Osteichthyes
    • Pacific Salmon, Oncorhynchus, from the Salminodae family live in the Great Lakes and the Pacific Ocean
    • Food diet depends on where they live; generally, zooplankton and smaller fishes
    • Born in fresh water but migrate and spend most of their life in salt water
    • Have six life cycle stages eggs-> alevin-> fry-> smolt-> adult-> spanwer
    • Used as food
  • Works Cited