Freshwater Update 91, March 2024

In this update we take a look at how native aquatic plants can be life rafts for our degraded freshwater lakes, whether the use of herbicides to treat invasive aquatic weeds is contributing to algal blooms, NIWA's new guidelines on eDNA and how 3D printing technology is helping save our native fish.

In this update we take a look at how native aquatic plants can be life rafts for our degraded freshwater lakes, whether the use of herbicides to treat invasive aquatic weeds is contributing to algal blooms, NIWA's new guidelines on eDNA and how 3D printing technology is helping save our native fish.

In this issue

  • Four circular net cages held up by poles placed in Lake Ohinewai

    Native aquatic plants life rafts for our lakes

    A team of NIWA freshwater ecologists are researching the use of biodegradable plant mats to help reintroduce native aquatic plants to degraded freshwater lakes in Aotearoa, New Zealand.

  • A 3D Printer is helping save New Zealand’s endangered native fish

    NIWA has developed a Photarium using the latest 3D printing technology to more safely identify and measure fish species that live in our waterways.
  • Rebecca Booth, NIWA Freshwater Ecology Technician, conducting eDNA sampling in a West Coast stream.

    NIWA provides new guidelines on eDNA

    The use of environmental DNA (eDNA) as a tool for biodiversity surveys is a rapidly advancing field with great potential.
  • An outbreak of Lagarosiphon at Lake Dunstan at Bendigo Station in Central Otago

    Is herbicide control of invasive aquatic weeds contributing to algal blooms?

    In Aotearoa New Zealand, the control of well-established invasive aquatic weeds in lakes is most often undertaken with herbicides because it is cost effective. Herbicide use leaves the treated weed biomass decaying in the waterbody.
  • Headshot of Karine Borne, Water Quality Scientist, smiling in business casual, taken outside with green lawn and trees in the background

    Staff Profile - Karine Borne

    Karine Borne is a Water Quality Scientist based in Auckland.