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Water Testing Results of Sites in the City of Bunbury

Control Site (Natural Habitat)

Site: Preston River , Boyanup Townsite

Water Test

15th March, 2005

31st March 2006

April 16th 2007

Nitrate mg/L

-

-

0.33

Phosphate mg/L

-

-

0.08

Ammonia mg/L

-

-

0

pH

5.8

7.54

6.98

Salinity ppk

0.38

0.38

0.40

Conductivity ms/cm 3

0.81

0.03

0.73

Turbidity

<10

<10

<10

 

All of these readings are within the desired levels for the breeding and growth of the Western Pygmy Perch and the Western Minnow.

After consulting “Australian and New Zealand Guidelines for Fresh and Marine Water Quality” and “Water Chemistry Series”, Ribbons of Blue/Waterwatch WA *, and the data collected from the Preston River, we have produced the table below as a control for the city waterways to be compared with.

Control Results

Water Test

Desired Levels

Nitrate mg/L

< 0.4

Phosphate mg/L

< 0.1

Ammonia mg/L

< 0.1

pH

5.5 – 8.5

Salinity ppk

0.40 or less

Conductivity ms/cm 3

0.80 or less

Turbidity

<10

* Water Quality Standards according to Ribbons of Blue/Waterwatch WA

Water Type

Nitrate content mg/L

Low

Medium

High

Standing

0 - 0.025

0.025 – 0.25

> 0.25

Flowing

0 - 0.05

0.05 - 0.4

> 0.04

Tannin

0 - 0.25

0.25 – 1.5

> 1.5

 

Water Type

Phosphate content mg/L

Low

Medium

High

Standing

0 - 0.005

0.005 - 0.05

> 0.05

Flowing

0 - 0.01

0.01- 0.1

> 0.1

Tannin

0 - 0.05

0.05 - 0.2

> 0.2

 

 

pH in standing or Flowing waterbodies

Normal

May Be Polluted

Pollution

5.0 – 7.0 (no Limestone)

8.5 – 9.0

< 4

7.0 – 8.5 ( Limestone)

4.0 – 5.0

> 9

 

 

 

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The flowing Preston River is the natural habitat to the Western Minnow and Western Pygmy Perch.

Macro Invertebrate Sampling in Water Sites in Bunbury City

KEY

Water Condition Index

Water body Quality rating

19 or less

Poor

20 - 34

Fair

35 - 49

Good

50 or more

Excellent

Site: Preston River, Boyanup

Species sampled

Sensitivity Rating

March 2005

March 2006

April 2007

Dragonfly larvae

6

6

6

Damselfly larvae

6

6

6

Caddisfly larvae

-

6

-

Water mites

-

-

-

Mussels

4

4

Marron

4

4

4

Beetle larvae

-

-

-

Beetle coleoptera

3

3

3

Bugs (water boatmen)

3

3

3

Daphnia/ water fleas

-

-

-

Cyclops

-

-

-

Freshwater shrimp

3

3

3

Flatworm

-

-

-

Ostracods

-

-

-

Fly larvae

2

-

-

Water Snails

3

3

3

Midgie larvae

1

1

1

Aquatic earthworms

1

-

-

Macroinvertebrate Water condition

36 Good

39 Good

29 Fair

Vertebrates

Gambusia

Gambusia

Gambusia

Swan River Goby

Swan River Goby

Western Pygmy Perch

Western Pygmy perch

Western Pygmy Perch

Western Minnow

Western Minnow

Western Minnow

Ducks- Black Pacific

-

Ducks- Black pacific

-

 

Water Index Rating for Test Sites

This is based on the number and type of macro invertebrates sampled.

It must be taken into account that the star ratings will also be determined by the season and the amount of water in the ponds.

Star Rating Guide:

× Wetlands is in urgent need of assistance to restore habitat and reduce nutrient input.

× × Wetland needs some assistance. Continue restoration.

× × × Wetland is in reasonable condition now. Keep monitoring it.

× × × × Wetland is healthy and diverse. Protect it.

 

Date

Water Index Rating

Star Rating Guide

February 2005

× × × Gambusia, Western Pygmy Perch, Western Minnow

Wetland is in reasonable condition now. Keep monitoring it

March 2006

× × × Gambusia, Western Pygmy Perch, Western Minnow

Wetland is in reasonable condition now. Keep monitoring it

April 2007

× × × Gambusia, Western Pygmy Perch, Western Minnow

Wetland is in reasonable condition now. Keep monitoring it

 

Conclusion

Chemical and biological analysis of the Preston River indicates the water quality is within the recommended limits for a healthy waterway able to support the Western Minnow and the Western Pygmy Perch. The fact that each sampling did show a healthy population of the Western Minnow, the Western Pygmy Perch and the Swan River Goby suggests that we can use our results from the Preston River for a model to measure the suitability of release sites in the Bunbury City Waterways.

 

 

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