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Cyanobacterial monitoring results

The Bay of Plenty Regional Council monitors the Rotorua Te Arawa Lakes for algal blooms. There are currently health warnings for Lake Rotoehu and Lake Okaro.

We monitor thirteen sites for cyanobacteria, spread across four lakes: Lake Rotorua, Lake Rotoiti, Lake Rotoehu, and Lake Ōkaro (and Lake Tarawera if required). These sites have been selected because they have been known to bloom in the past and the area is regularly used by the public for recreational activities.  

Sites are given an alert level status based on the number of bacteria found. These results help Toi Te Ora to make a decision on whether a health warning should be put in place.

 

 

Key

Alert Level

Biovolume (mm3/L)

Green

<0.5

Amber

0.5 - 9.99

Red

>10

 

 

 

LOCATION

 

05/04/2018

29/03/2018

22/03/2018

Kaituna

Trout Pool

N/A

0.0187

0.0128

0.0819

Okaro

Boat Ramp

0.3798

0.0026

0.0027

0.0022

Rotoehu

Kennedy Bay

0.5998

0.5178

35.8247

1.7856

 

Otautu

11.6437

1.5489

69.1876

37.8119

Rotoiti

Okawa Bay

0.0265

0.0163

0.0089

0.9474

 

Okere Arm

0.0045

N/A

0.0232

0.0128

 

Otaramarae

N/A

0.0045

0.0069

0.0133

 

Hinehopu

0.0118

N/A

0.0284

0.0371

 

Te Weta

N/A

0.0174

0.0089

0.4166

Rotorua

Hamurana

0.0170

N/A

0.0067

0.0000

 

Holdens Bay

N/A

0.0012

0.0144

0.0204

 

Ngongotaha

0.0522

N/A

0.0023

0.0033

 

Ohau Channel

0.0038

0.0074

0.1646

00.0011

 

 

 

 

April 17, 2018 results:

Lake Rotoehu

The results from April 13 showed that Kennedy Bay remained in the Amber ‘alert’ level. Whilst Ōtautū Bay increased into the Red ‘action’ level. The main toxic species present at both sites of Lake Rotoehu was a Microcystis species.

 

Lake Rotoiti

All of the sites Lake Rotoiti remained in the green ‘surveillance’ level.

 

Lake Ōkaro

Lake Ōkaro remained in the green ‘surveillance’ level

 

Lake Rotorua & Kaituna 

The sample sites in Lake Rotorua and The Kaituna River (trout pool) remained in the green ‘surveillance’ level.

 

Visual observations summary:

Samples taken on April 13 were collected on an overcast day. There was visual signs of suspended particulate matter in Lake Rotoehu (both sites). Attached are photos of the water appearance at Ōtautū Bay of Lake Rotoehu on April 13.

 

Please note, for those sites that have been consistently in the green surveillance level we have reduced the monitoring to fortnightly samples. 

For earlier results please email info@rotorualakes.co.nz