Across
- 3. Dissolved oxygen levels are measured in PPM, or parts per _______.
- 4. If DO levels are low in water, an _______ can be used to improve the oxygen levels by adding more O2 to the system.
- 6. Ammonia is converted into the slightly less toxic form called _______ in about ten days.
- 8. Nitrite is converted into the even less toxic form of ammonia known as ______ by nitrifying bacteria.
- 9. pH measures the _______ or alkalinity in water with either a meter or litmus paper.
- 10. ______ oxygen is the oxygen present in water and available to aquatic organisms.
Down
- 1. Water ______ is the key to production of aquatic organisms.
- 2. Two common gases found in water are oxygen and ______.
- 5. Most aquatic plants and animals prefer a pH between _______ and eight.
- 7. There is more dissolved oxygen present in ______ than fresh water.
- 9. _______ is the original waste product of aquatic animals that is HIGHLY toxic.