Observing freshwater macroinvertebrates
In this activity, students collect and observe macroinvertebrates from a local freshwater stream.
A water boatman
The water boatman (Corixidae: Sigara) is a macroinvertebrate found in streams, lakes and ponds. Their hairy legs are adapted for swimming in slow-moving water.
By the end of this activity, students should be able to:
recognise that invertebrates are part of freshwater ecosystems
safely capture freshwater macroinvertebrates for observation
group macroinvertebrates according to observable features.
Download the Word file (see link below) for:
introduction/background notes
what you need
what to do
extension ideas.
Nature of science
Observation is a key component of science. Observation can happen at many levels – from carefully looking at creatures while working at the water’s edge, through to full identification and classification.
Related content
Discover more about New Zealand’s aquatic insects.
Environmental DNA is a tool scientists use to monitor freshwater ecosystems. Find out more about environmental DNA and use this hands-on and feet-on activity to ‘sample’ eDNA in a lake system.
Useful links
Macroinvertebrate monitoring is an important part of measuring stream health. There are numerous freshwater monitoring guides available. Check with your local regional council for resources and kits specific to your area.
The Department of Conservation has a more detailed guide to Freshwater ecology inventory and monitoring.
NIWA’s Stream Health Monitoring and Assessment Kit enables non-scientists to collect consistent, scientifically valid information.
Literacy links
‘Wonderful Water’ by Philippa Werry (Connected 3 2004) describes a class investigation of two Wellington streams.
‘The Water Wardens’ by Alan Bagnall (Connected 2 2002) tells how a class is inspired to adopt a nearby stream.
