Fish elements

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Across
  1. 2. on osmoregulation, fish are __
  2. 3. is from this country
  3. 4. organism has three hearts
  4. 8. Most toxic fish in the world
  5. 9. Collective noun for a group of fish
  6. 10. of fish nutrition
  7. 12. Largest ocean in the world
  8. 14. species of fish is Nemo in the movie, Finding Nemo?
  9. 15. and chips is the national dish of this country
  10. 17. oxygen-transport pigment in some invertebrates
  11. 19. cultured fish in the world
Down
  1. 1. of Norway
  2. 5. Common name of Hypophthalmichthys molitrix
  3. 6. First capital city of Nigeria
  4. 7. 1 country in aquaculture production
  5. 8. study of fish
  6. 11. of fish muscles after death
  7. 13. The Great Barrier Reef is found in this country
  8. 16. fish in the world
  9. 18. name of sodium chloride