Aquaculture

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Across
  1. 4. Closed system where water is filtered and reused.
  2. 8. Measure of acidity or alkalinity of a substance.
  3. 9. Protective outer covering of a fish.
  4. 11. Intermediate nitrogen compound formed from ammonia.
  5. 13. Sensory system that detects vibrations in water.
  6. 14. Animal whose body temperature matches environment.
  7. 15. Toxic waste product produced by fish.
  8. 17. Less toxic nitrogen form used by plants.
  9. 19. Maximum number of organisms an ecosystem can support.
  10. 20. Fin on the top of a fish used for balance.
  11. 22. Raising fish in net enclosures in existing water.
  12. 23. Tail fin used to propel a fish through water.
Down
  1. 1. Raising fish in natural or artificial ponds.
  2. 2. Protective covering over the gills.
  3. 3. Organ fish use to exchange oxygen from water.
  4. 5. Process that converts nitrogen into different forms.
  5. 6. Cultivation of aquatic organisms in controlled environments.
  6. 7. Organ fish use for their sense of smell.
  7. 8. Fin that controls up and down movement.
  8. 10. Process of adding oxygen into water.
  9. 12. Flow through system using channels or tanks.
  10. 16. Volume of free oxygen present in water.
  11. 18. Measure of dissolved salts in water.
  12. 21. Fin that controls side to side movement.