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Fish Vision

Fish Vision. Andy Kulp Gavin Page Derek Shockey. Similarities to Humans. Similar anatomical structures Cornea Iris Lens Retina with rods and cones Many see in color. Differences from Humans. Lens is large and spherical Lens has a greater density Focus by moving lens forward/backward

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Fish Vision

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  1. Fish Vision Andy Kulp Gavin Page Derek Shockey

  2. Similarities to Humans • Similar anatomical structures • Cornea • Iris • Lens • Retina with rods and cones • Many see in color

  3. Differences from Humans • Lens is large and spherical • Lens has a greater density • Focus by moving lens forward/backward • Much greater field of vision • Some have no blind spots, even behind • Flounder have eyes on same side

  4. Differences from Humans • No eyelids in general • Some have clear protective shield • Greater sensitivity to light • Cannot dilate pupils • Slower to adjust to new light levels • Monocular vision • Can focus on separate objects

  5. Differences Among Fish • Eye size varies • Noctural fish have larger eyes than diurnal fish • Some have Tapetum lucidum • Amplifies incoming light • Difference in visible spectral range • Four-eyed fish

  6. Vision Comparison How the Senses of Walleye Compare to Those of Other Gamefish www.thecontentwell.com

  7. Fish at Depth • Most deep sea fish most sensitive to light in the range 474-490nm • Same as sunlight which reaches this depth • Corresponds to bioluminescence of these fish • Most of these fish are not sensitive to color • Some have few or no cones

  8. Fish at Depth www.fishbase.org

  9. Sharks • Sharks have nictitating membrane • Clear eyelid is deployed during attack to protect eyes from thrashing • Tapetum lucidum amplifies light • Can see in varying light conditions

  10. Sources • http://www.cephbase.utmb.edu/refdb/pdf/7761.pdf • http://www.pigeon.psy.tufts.edu/avc/husband/avc4eye.htm • http://www.eyedesignbook.com/ch3/eyech3-d.html#D.%20Fish • http://www.everwonder.com/david/sharks/anatomy/ • http://www.mar.dfompo.gc.ca/science/shark/english/eye.htm • http://www.enchantedlearning.com/subjects/sharks/glossary/indexe.shtml • http://www.oceansonline.com/sharks2.htm • http://www.seaworld.org/infobooks/Sharks&Rays/eyes.htm • http://www.milton.edu/academics/pages/marinebio/shark.html • http://www.photonics.com/spectra/applications/XQ/ASP/aoaid.196/QX/read.htm • http://www.azod.com/Fishing/FlyFishing/Archives/2001/Your%20Flies%20Through%20Fish%20Eyes.htm

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