As another outbreak of potentially toxic algae hits
Tomahawk Lagoon, the Otago Regional Council has promised to
brief the community on the problem.
The latest weekly samples from Tomahawk Lagoon have shown
high levels of the potentially toxic cyanobacteria
(blue-green algae) in the upper lagoon.
This follows high levels of the algae being found in the
lower lagoon last month and another outbreak last year.
Cyanobacteria can produce toxins which may cause illness,
such as skin reactions, in people and animals.
Warning signs put up during earlier outbreaks remained, but
more signs would be installed around the upper lagoon.
Otago Regional Council director of engineering, hazards and
science Gavin Palmer said the algae had been present
throughout the summer, mostly at low levels. It was not
possible to predict how long it would take to recede again.
''We are urging parents to keep their children out of the
water and dog owners to do the same with their pets,'' Dr
The algal blooms were linked to many factors, including high
nutrient concentrations in the water and lagoon bed.
Nutrients in the lagoon bed were released when strong winds
stirred up the sediment.
Council staff would continue to monitor the situation and
update the public with developments, he said.
Staff had met representatives of the Tomahawk community this
week and would be preparing a paper collating research on the
lagoon and blooms done by various organisations over the
years for council consideration in April.
After this, a public meeting would be organised to brief all
who were concerned, he said.
People could also join the council's email list to receive
the sampling results weekly.
Otago Peninsula Community Board member Paul Pope said the
meeting with the regional council was about ensuring the
community got information about the blooms as soon as
possible as well as opening up a dialogue between the council
and community about future action.
''We need good liaison with the regional council and its
scientists,'' he said.