envirothon aquatics wqi

what dissolved oxygen level is considered healthy?

>5 ppm

what dissolved oxygen level is not enough to support life?

0-2 mg/L

what dissolved oxygen level can few fish/aquatic organisms survive in?

2-4 mg/L

What is the minimal amount of Dissolved Oxygen in mg/L for most fish?

2 mg/L

what pH do fish prefer?

6.5-9

how should pH be measured?

Measure away from the bank, just below the surface

how should temperature be measured?

Measure 1 mile above and below + at the suspected source for thermal pollution just under surface

-AVOID SHADED AREAS

what level is phosphorus typically?

< 10ppm

How do you use macroinvertebrates to determine water quality?

sensitive species 3 + somewhat sensitive 2 + tolerant *1

BOD (biological oxygen demand)

total amount of oxygen required by bacteria to decompose all the organic material in a water sample, Indirectly measures amount of organic material in the water

What BOD level is very clean water w/little organic decay?

1-2ppm

What BOD level is moderately clean with some decay?

3-5ppm

What BOD level is much decay/algal blooms?

6-9 ppm

What BOD level is very unhealthy levels of decay/untreated sewage?

10+ ppm

What dissolvd oxygen level is good for many aquatic animals and low for cold water fish?

4-7 mg/L

What dissolved oxygen level is very good for most stream fish?

7-11 mg/L

what are natural levels of phosphorus?

0.005-0.05 mg/L, should not be >1 mg/L

how is fecal coliform measured?

membrane filtration

how is e. coli measured?

multiple tube/well testing