Place Holder

Place Holder

Before you jump in know what you're getting in to

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

31/05/2018

24/05/2018

18/05/2018

10/05/2018

Kaituna

Trout Pool

   

0.0161

 

Okaro

Boat Ramp

0.0030

0.0153

0.1664

0.3219

Rotoehu

Kennedy Bay

0.0052

0.3889

0.0659

0.0279

 

Otautu

0.1633

0.6433

0.3492

0.8465

Rotoiti

Okawa Bay

0.5806

0.7031

0.2640

0.0013

 

Okere Arm

0.0018

   

0.0037

 

Otaramarae

0.1085

 

0.0050

 

 

Hinehopu

 

0.3022

 

0.0042

 

Te Weta

0.0008

 

0.0014

 

Rotorua

Hamurana

 

0.0016

 

0.0009

 

Holdens Bay

0.0008

 

0.0042

 

 

Ngongotaha

 

0.0017

 

0.0018

 

Ohau Channel

0.0010

0.0048

0.0008

0.0060

 

 

 

 

May 31, 2018 results:

Please note that this is the last sample for the 2017/2018 cyanobacteria monitoring season

Monitoring will recommence in late November 2018.  In the meantime, please direct any questions or queries to  james.dare@boprc.govt.nz.

Lake Rotoehu

The results from May 31 showed that Kennedy Bay remained in the green ‘surveillance’ level and  Ōtautū Bay decreased into the green ‘surveillance’ level

 

Lake Rotoiti

Okawa Bay of Lake Rotoiti remained in the ‘amber alert level’. The dominant toxic species found in Okawa Bay was Dolichospermum cf. circinale.

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

 

Visual observations summary:

Samples from May 31 were collected on a fine day. There was subtle visual signs of suspended particulate matter in Okawa Bay and Otaramarae of Lake Rotoiti. Visual signs of particulate matter were also noticed at Otautu Bay of Lake Rotoehu. Attached are photos of the water appearance at Okawa Bay, Otaramarae, and Ōtautū Bay taken on May 31.

 

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