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Water Testing Results of Sites in the City of Bunbury

RESULTS

Experimental Site 5  

Site: St Mark’s Pond, Picton 

 

Water Test

Results

23rd February, 2005

6th November 2006

April 2007

Nitrate mg/L

0.299

-

-

Phosphate mg/L

1.940

-

-

Ammonia mg/L

1.152

-

-

pH

8.29

7.4

8.16

Salinity ppk

0.50

0.39

0.18

Conductivity ms/cm 3

0.99

0.85

0.36

Turbidity

25

25

15

 

 

The pH level reaches the upper acceptable limit in 2005 and 2007. This similar situation occurred at Horseshoe lake. The higher readings also occurs at the time of low water levels in the ponds. Limestone or detergents could increase the alkalinity of water.

The Bunbury area is located near an underground limestone ridge, so this could be a natural source of limestone leaching into the groundwater.

 

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: St Mark’s Pond, Picton  

Species sampled
Sensitivity Rating
February 2005
November 2006
April 2007

Dragonfly larvae

6

6

-

Damselfly larvae

-

6

-

Caddisfly larvae

-

6

-

Beetle larvae

-

4

-

Beetle coleoptera

-

3

3

Bugs (water boatmen)

3

-

3

Daphnia/ water fleas

3

3

-

Copepods

3

-

3

Flatworm

-

3

Ostracods

-

-

3

Water Snails

3

3

3

Midgie larvae ,mosquito larvae

1

1

1,1

Aquatic earthworms

1

1

1

Macroinvertebrate Water condition

20 Fair

36 Good

 18 Poor

 

  Vertebrates

Gambusia

Swan River Goby

Ducks

Ducks

Gambusia

-

 

Ducks

-

-

Long neck tortoise

-

-

 

-

Checking nets for fish at St Mark’s Pond

 

Water Index Rating for Test Sites

St Mark’s Pond, Picton

Date

Water Index Rating

Star Rating Guide

February 2005

× × Gambusia

Wetland needs some assistance. Continue restoration

November 2006

× × × Gambusia

Wetland is in reasonable condition now. Keep monitoring it

April 2007

× × ×

Wetland is in reasonable condition now. Keep monitoring it

 

Conclusion

Our sampling has indicated a fair level of water quality that is able to support a native fish species. The sedges and emergent grasses around parts of the pond perimeter will provide protection and attachment of the developing fish eggs. This small area supports a large diversity of water birds. We have found long neck turtles and swan river goby fish. The sediment of this lake is very thick (up to 10 cm), black and muddy. It forms the original flood plain of the Preston River which flows less than 200m away.

Western Pygmy Perch were released here in 2005, 2006 and 2007. Western Minnow were released in 2006 and 2007.

The pond is surrounded by housing, so people live in very close proximity to a natural mosquito habitat. Releasing the Western Minnow and Western Pygmy Perch is a positive step in controlling the mosquito and midgie problem in this suburban area.

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