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Lecture 17. October 15, 2008 Osmoregulation & Excretion

Lecture 17. October 15, 2008 Osmoregulation & Excretion How many students are missing the lab notebook? Need 2 graduate student volunteers to enter data. Deepest Sea Fish Ever Found!! - Liparidae - Snail Fish Family - Scorpaneiformes - 4.8 miles down - no airspaces

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Lecture 17. October 15, 2008 Osmoregulation & Excretion

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  1. Lecture 17. October 15, 2008 Osmoregulation & Excretion How many students are missing the lab notebook? Need 2 graduate student volunteers to enter data.

  2. Deepest Sea Fish Ever Found!! - Liparidae - Snail Fish Family - Scorpaneiformes - 4.8 miles down - no airspaces - despite no light, it has eyes - presumably to see bioluminescence - if you subject nerves or muscle to that much pressure, they stop working. - must have adaptations that allow for all that pressure http://www.npr.org/templates/story/story.php?storyId=95567915&live=1&ps=bb1

  3. Thought Question Active fish have higher relative surface areas than inactive fish. Why don’t all fish have high relative surface areas?

  4. Dissolved Solutes in Different Types of Water

  5. hagfish

  6. sharks - hammerhead Sharks use trimethylamine oxide (TMAO) which protects them from high urea.

  7. toadfish - SW

  8. goldfish - FW

  9. freshwater stingray

  10. Gill Models http://www.biology.ualberta.ca/courses/zool241/index.php?Page=1815 Take home point: This is somewhat complex.

  11. Some saltwater teleosts lack a glomerulus in their kidney. What does a glomerulus do? Why would this be a good thing for saltwater teleosts?

  12. Thought Questions 1. What properties/traits that affect osmoregulation do you think would change when catadromous eels migrate from f.w. to s.w. to spawn? 2. What properties/traits do you think would change when anadromous lampreys migrate from s.w. to f.w. to spawn? 3. Why are saltwater Elasmobranchs have a slightly higher total ion concentration than the surrounding seawater?

  13. Review Questions. 1. Distinguish between an osmoregulator, an osmoconformer, an ion regulator, and an ion conformer. For each of the following taxa, explain their strategy in regards to ion/water balance: hagfish, shark, toadfish, goldfish, f.w. stingray. 2. Why do inactive fish have low relative gill surface volumes? Why not have a large gill surface volume to get more O2 in the body? Hint: what problem does large gill surface area lead to? 3. How do fish regulate their pH? Did you read page 91? 4. Why don’t freshwater stingrays maintain urea in their bodies? Why do saltwater Elasmobranchs maintain TMAO in their bodies? 5. What properties/traits that affect osmoregulation do you think would change when catadromous eels migrate from f.w. to s.w. to spawn? What properties/traits do you think would change when anadromous lampreys migrate from s.w. to f.w. to spawn? 6. From the book. What hormones are involved in the transition from freshwater to saltwater? What hormones are involved in the transition from saltwater to f.w.? 7. Why do some saltwater teleosts lack a glomerulus?

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