i love fishes

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Across
  1. 1. the study of fishes
  2. 4. class of cartilaginous fishes
  3. 7. light belly darker top side
  4. 8. slimy substance
  5. 9. fish use this to keep up right and so they don't sink
  6. 12. upper side of a fish
  7. 14. having both male and female body parts
  8. 15. flap of skin that protects the gills
  9. 17. underside of a fish
Down
  1. 2. a line on a fish's body that detects changes in water pressure
  2. 3. fish use this to get oxygen from the water around
  3. 5. when water flows through the gills in the opposite direction of the blood in a fish
  4. 6. living near the bottom of a sea or lake
  5. 7. of or like a tail
  6. 10. class of jawless fishes
  7. 11. prevents food from passing through the gills of a fish
  8. 13. class name for bony fishes
  9. 16. a protein used in skin care