In warm temperatures, chemical contaminants reaching lakes or rivers can result in blooms of blue-green algae, such as occurred in Lake Waihola, South Otago, in February 2002.
Te whakamahi i tēnei tūemi
Otago Regional Council
Photograph by Juliet Milne
This item has been provided for private study purposes (such as school projects, family and local history research) and any published reproduction (print or electronic) may infringe copyright law. It is the responsibility of the user of any material to obtain clearance from the copyright holder.