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