WATER QUALITY

Question 1

_______ is the most common substance on Earth, covering more than ___ percent of the planet’s surface

Answer 1

Water; 70

Question 2

All living things consist mostly of _______.

Answer 2

water

Question 3

Water is a ____________ substance that appears blue when depth is at least 6 meters. The color results not only from physical causes but also suspended impurities.

Answer 3

clear colorless

Question 4

BIOLOGICAL PARAMETERS:

Answer 4

1. Flora
2. Fauna

Question 5

Flora
a. Macroscopic:

Answer 5

Water cress, water lilies etc.

Question 6

Flora
b. Microscopic:

Answer 6

different species of algae and phytoplankton

Question 7

Fauna
a. Macroscopic:

Answer 7

Snail, tilapia, Carp, Million Fish, Japanese weather fish, Dragon fly Naiad, Spring tail, Water beetle, King Fisher, White breasted water Hen etc.

Question 8

Fauna
b. Microscopic:

Answer 8

Bacteria Example: E. coli

Question 9

____________ are bacteria found in the environment, foods, and intestines of people and animals. E

Answer 9

Escherichia coli

Question 10

Physical Parameters:

Answer 10

1. Temperature
2. Depth
3. Light Penetration
4. Total Suspended Sediments (TSS)
5. pH
6. Dissolved Oxygen
7. Nitrate
8. Hardness (Calcium and magnesium)
9. Chloride

Question 11

Best growth rates at warm water temperatures > _____

Answer 11

21 degree celsius

Question 12

At _______ depth, weight gain was significantly increased to 348-362 g per fish, feed conversion improved to 2.53-2.59 and mortality reduced to 21-27%.

Answer 12

1-2 meters

Question 13

Important to support phytoplankton by photosynthesis

Answer 13

LIGHT PENETRATION

Question 14

The ____ acts to dehydrate the skin of animals and high concentrations of dissolved solids can add a laxative effect to water or cause water to have an unpleasant mineral taste.

Answer 14

salt

Question 15

pH recommended for drinking water is:

Answer 15

6.5-8.5

Question 16

protection of aquatic environment:

Answer 16

pH 5-5.9

Question 17

Rainfall pH value

Answer 17

between 5 and 6.5

Question 18

Natural pH value

Answer 18

5.6

Question 19

Effects of pH Levels on Aquatic Life pH Effect
* __________ Unlikely that fish can survive for more than a few hours in this range, although some plants and invertebrates can be found at pH levels this low

Answer 19

3.0 – 3.5

Question 20

________ Likely to be harmful to salmonids and perch if present for long periods

Answer 20

9.0 – 10.5

Question 21

the amount of oxygen that is present in water

Answer 21

Dissolved oxygen

Question 22

Usual dissolve oxygen for streams is _______.

Answer 22

7-10mg/liter

Question 23

Water bodies receive ________ from the atmosphere and from aquatic plants.

Answer 23

oxygen

Question 24

_________, such as that of a swift moving stream, dissolves more oxygen than the still water of a pond or lake

Answer 24

Running water

Question 25

________ are an important source of nitrogen necessary for plants and animals to synthesize amino acids and proteins.

Answer 25

Nitrates

Question 26

Sources of Nitrate ions:

Answer 26

• Agricultural runoff
• Urban runoff
• Animal feedlots and stock yards
• Municipal and industrial wastewater
• Automobile and industrial emissions
• Decomposition of plants and animals

Question 27

The recommended upper level for drinking water is _____ but higher levels do not cause health risks.

Answer 27

50mg/L

Question 28

If the calcium ion concentration in freshwater drops below _____, the ability of the water to support life is dramatically decreased, resulting in oligotrophic condition.

Answer 28

5mg/L

Question 29

_______ is an indicator of the presence of animal waste and sewage

Answer 29

Chloride