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Tuna - diet
Longfin eels are the largest and longest-lived fish in New Zealand's freshwaters, and where they are present they are the top predator. -
Freshwater monitoring and reporting
Research ProjectNIWA's research on freshwater monitoring and reporting is one of three research areas within the 'Values, Monitoring and Outcomes' (VMO) programme led by Landcare Research. -
Nutrients and wastewater
How do nutrients from wastewater treatment enter waterways? -
Coralline Algae
This identification guide covers the common crustose coralline algae found in central New Zealand. -
New Zealand rushes (Juncus): factsheets and key
New Zealand rushes (Juncus): species-level factsheets. -
Modified habitat
A habitat is an environment or place where animals normally live. -
Kōaro
Kōaro are excellent climbers and like clear, swiftly flowing, forested streams. -
Common hydrological terms
Education ResourceDescriptions of the common terms that explain the processes that occur in hydrology. -
Tuna - tuna heke (downstream migrants)
Once eels become migrants (also known as tuna heke or tuna whakaheke) they stop feeding, and progressively develop the external features that clearly distinguish them from 'feeders'. -
Nutrient overloading
Nutrients in waterways are essential for the growth of algae and aquatic plants but too much can destroy an ecosystem. -
Nature knows best?
Feature story06 June 2017Returning water to our waterways after we’ve used it in our homes, on farms and in industry is a complex and challenging process.
