Toxic Algae Monitoring

Phormidium cyanobacteria % cover at river monitoring sites
Date Maitai at Avon Terrace Maitai at Dennes Hole Maitai at Campground Wakapuaka at Hira Reserve Isel Park

2022/23

8 March 2023 <1% 0% <1% 6.5% 1%
1 March 2023 <1% 0% 2.75% 10% -
24 February 2023 <1% 0% 5.5% - -
22 February 2023 - - - - <1%
15 February 2023 2.5% 0% 1.5% 4.5% <1%
10 February 2023 <1% <1% <1% 3.15% <1%
3 February 2023 1.5% <1% <1% 5.5% -
25 January 2023 3.75% <1% 3.5% 2.5% <1%
18 January 2023 7.5% 1% 8% 4.3% -
13 January 2023 - - - - <1%
12 January 2023 18.75% - 3.75% - -
11 January 2023 17.25% 1.75% 4.5% 1.25% -
4 January 2023 21% - 12% <1% -
28 December 2022 32.72% 2.6% 6% <1% -
23 December 2022 22.5% <2% 7% - <1%
21 December 2022 29.25% - - - -
20 December 2022 - 5.5% 12.5% <1% -
15 December 2022  22.25% - - - <1%
14 December 2022 - 9% 9.25% - -
12 December 2022 16.5% - - - -
2 December 2022 14% 6.25% 4.1% <1% <1%
25 November 2022 11.35% 2.1% <1% 0% 0%
17 November 2022  5.55% 5.25% 3.6% 0% <1%

11 November 2022 

 3.25% - <1% - <1%

11 March 2022

 <5% <5% <5% <5% <1%
9 March 2022 - - - <5% -

4 March 2022

 - - - - <1%

18 Feb 2022

 1% 2% 6.8% - <1%

28 Jan 2022

 0% 0% 0% 4.7% <1%

21 Jan 2022

 - - - - <1

19 Jan 2022

 - - - 12.5 -

17 Jan 2022

 0 0 0 - -

 5 Jan 2022

 10.45 3.5 35.75 8.85 <1

 

2020/21

29 Dec 21

 35.75 12.75 44.25 2.4 not sampled

24 Dec 21

 40 26 49 3 <1

14 Dec 21

 14.75 21.5 35.75 <1 <1

2 Dec 21

 49 19 43 <1 -

26 Nov 21

 36.85 16.85 32.95 1 -

16 Nov 21

 13 9 32.5    

8 Nov 21

 8.75 3.25 32 0  

15 Feb

 2 0 0 5.75 20
4 Feb 0.5 0 0 10.5 7.25
20 Jan 2 0 0 8.75 0.75
7 Jan 20.75 0.5 0.75 8 3.25
30 Dec 21.3 4 4 3 2.35
15 Dec 41 21.25 23.5 0.25 0
7 Dec 29.5 28.5 26 1.25  -
Phormidium cyanobacteria % cover at river monitoring sites
Date Maitai at Avon Terrace Maitai at Dennes Hole Maitai at Campground Wakapuaka at Hira Reserve
2019/20
6 Mar 0 0 0 0.25
28 Feb 0 0 0 0.25
14 Feb 0 0 0 2
5 Feb 2 2 0 15
29 Jan 0 0 0 0
24 Jan 2 0 0 1.25
13 Jan 15.75 16.75 20.25 5
7 Jan 16.5 20 21.5 1.5
3 Jan 10 5 15 2
31 Dec 12 25.5 28 5
24 Dec 9.5 16.75 13.75 2
11 Dec 16.25 13.25 14.75 0
6 Dec 2.55 5.75 5 0
29 Nov 21.25 7.75 21.25 0.25
19 Nov 10.25 7.75 11.25 0
19 Mar 0 0 0 0
12 Mar 0 0 0 0
27 Feb 0 0 0 0
15 Feb 0 0 0 0
8 Feb 0 0 0 0
1 Feb 0 0 0 0
25 Jan 0 0 0 0
18 Jan 0 0 0 0
15 Jan 0 0 0 0
3 Jan 0 0 0 0
2018
27 Dec 0 0 0 0
20 Dec 0 0 0 0
17 Dec 6.6 1.75 1.75 3.25
3 Apr 7.75 1.25 4.75 1
21 Mar 10.25 0.5 2.5 3
14 Mar 7.75 0.5 1.5 2.5
7 Mar 3.25 0.25 1 1.75
28 Feb 3 0 0 0.25
22 Feb Not surveyed due to high flows
15 Feb 0 0 0 0
7 Feb 13.25 0 0 2
31 Jan 9 0 0 1.75
24 Jan 0.75 0 0.5 0.25
17 Jan 0.25 0 0 0.75
10 Jan 0.25 0 0 0.25
3 Jan 0.5 0 0 1.25
2017
27 Dec 0 0 1.75[dm] 1[dm]
20 Dec 2.25[dm] 0.75[dm] 9.5[dm] 2[dm]
13 Dec 7[dm] 2[dm] 13.5[dm] 3.75[dm]
6 Dec 15 [dm] 2.75 [dm] 18.75 [dm] 2.25 [dm]
29 Nov 25 4.75 17.8 3.5
22 Nov 31 6 14.25 4.25
15 Nov 28 9 15.5 3.8
10 Nov 18 14 10.25 2.75
29 Mar 10.75 0 0 2.75
22 Mar 7.75 0 0 1.5
16 Mar 3.75 0 0 2
9 Mar 5.5 0 0 1.5
1 Mar 5.25 0.5 0 1.75
23 Feb 7.75 0.75 0 2.75
15 Feb 8.25 1.25 0 2
9 Feb 7.5 1.25 0 2
1 Feb 4.25 2 0.5 1
26 Jan 0.5 2 0 0
18 Jan 15 15 0 0
11 Jan 16 14 3.5 0.5
4 Jan 16 17.5 3 0
2016
28 Dec 14 12.5 2 0
21 Dec 23.5 21 12.5 0
15 Dec 21.5 17 8.5 0
6 Dec 23.5 17 11 0
30 Nov 21 12.5 6.3 0
21 Nov 3 6 3 0
16 Nov Not surveyed due to high flows
9 Nov 28 22 3 2
18 Oct 12 [High Flows] 4 0

[dm] : detaching mats