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Water Testing Results of Sites in the City of Bunbury 

Selected Test Sites: Big Swamp, Dodson Street lake, Five Mile Brook ,Horse shoe Lake, St. Marks Pond, West Street Sump.  

RESULTS

Experimental Site 1  

Site: Big Swamp SE Corner

 

Water Test

Result

15 th March 2005

31 st March 2006

6 th March 2007

East

East

West

East

West

Nitrate mg/L

-

-

-

-

-

Phosphate mg/L

-

-

-

-

-

Ammonia mg/L

-

-

-

-

-

pH

8.08

8.05

8.57

7.91

8.03

Salinity ppk

1.06

0.87

0.99

0.88

1.03

Conductivity ms/cm 3

2.12

1.73

1.85

2.05

2.13

Turbidity

< 10

< 10

< 10

20

23

 

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

 

1

Examining the water at Big Swamp for macro invertebrates, March 2007.

Site: Big Swamp SE Corner

Species sampled

Sensitivity Rating

February 2005

March 2006

March 2007

Dragonfly larvae

-

6

-

Damselfly larvae

6

6

6

Caddisfly larvae

-

6

-

Water mites

-

-

5

Beetle larvae

-

-

-

Beetle coleoptera

3

3

3

Bugs (water boatmen)

-

3

-

Daphnia/ water fleas

-

3

-

Cyclops

-

-

-

Freshwater shrimp

3

3

3

Flatworm

-

-

-

Ostracods

-

3

-

Water Snails

3

3

3

Midgie larvae

-

-

-

Aquatic earthworms

-

-

-

Macroinvertebrate

Water condition

15 Poor

36 Good

20 Fair

Vertebrates

Gambusia

Gambusia

Gambusia

Ducks

Ducks

Ducks

Water Index Rating for Test Sites

Site: Big Swamp SE Corner

Date

Water Index Rating

Star Rating Guide

March 2005

× × Gambusia

Wetland needs some assistance. Continue restoration

 

March 2006

× × × Gambusia

Wetland is in reasonable condition now. Keep monitoring it

March 2007

× × Gambusia

Wetland needs some assistance. Continue restoration

 

 

11
Releasing Western Pygmy Perch into the East side of Big Swamp in March 2007

 

 Conclusion

Initial concern was with the high level of salinity on the west side (sea water can flow in during winter). The salinity on the east side has stayed below 0.90 ppk so fifty Western Perch were released in March 2007.

1
The East side of Big Swamp . This area has less salinity than the west side and is buffered by many islands.

 

 

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