A serious concern in South Island lakes, and widespread in the North Island, Lagarosiphon major is an aggressive water weed. The stems grow up to 5 metres long. Stem fragments are the main means by which the weed spreads. The small fish is about 5 centimetres long.
Te whakamahi i tēnei tūemi
NIWA – National Institute of Water and Atmospheric Research
Photograph by John Clayton
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