Fish elements

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Across
  1. 3. Fastest fish in the world
  2. 7. Father of fish nutrition
  3. 8. First capital city of Nigeria
  4. 9. No. 1 country in aquaculture production
  5. 10. Collective noun for a group of fish
  6. 13. Which species of fish is Nemo in the movie, Finding Nemo?
  7. 15. Common name of Hypophthalmichthys molitrix
  8. 17. This organism has three hearts
  9. 18. Fish and chips is the national dish of this country
  10. 19. Sushi is from this country
  11. 20. Scientific study of fish
Down
  1. 1. Based on osmoregulation, fish are __
  2. 2. Stiffening of fish muscles after death
  3. 4. Most toxic fish in the world
  4. 5. Copper-containing oxygen-transport pigment in some invertebrates
  5. 6. Largest ocean in the world
  6. 11. Most cultured fish in the world
  7. 12. Capital of Norway
  8. 14. Common name of sodium chloride
  9. 16. The Great Barrier Reef is found in this country