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Īnanga - the most common of our whitebait species - are in trouble. Listed as 'Threatened: Nationally Vulnerable', their numbers have declined significantly within a generation.

The National Īnanga Spawning Programme (NĪSP) is a nationwide programme to identify, monitor, protect, and restore īnanga spawning habitat across Aotearoa. The NĪSP team works alongside the Department of Conservation, regional and territorial authorities, community groups, and tangata whenua to protect this taonga species for future generations.

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Background

Is the whitebait fritter at risk?


It helps to understand whats actually in a whitebait fritter.


'Whitebait' is a collective terms for the juvenile stage of six native fish species: kōaro, īnanga, shortjaw kōkopu, giant kōkopu, common smelt, and banded kōkopu. Of these, īnanga are the most commonly caught, making up 90% of the whitebait catch. 


This masks a concerning reality: their numbers are declining...very sharply,  in some areas. They are classfied as 'Threatened: Nationally Vulnerable' under the DOC threat classification guidelines.


A diurnal (migratory) species, īnanga are washed out to sea after they hatch. There, they become an important part of the marine food web. As they grow, they migrate back to freshwater environments, where some are caught as whitebait.


Once they mature, they look to spawn. 


Their spawning habitat relies on riverside and wetland habitat, at the highest point of the saltwater high tide. 


This is the biggest threat to īnanga. New Zealand has drained 95% of its wetland habitat, and the remaining īnanga spawning habitat is at risk from:

 

● Urban development and river modification

● Vegetation clearance and mowing

● Livestock access and bank erosion

● Poor water quality and sedimentation

● Climate change and sea-level rise

● Habitat fragmentation and invasive species

● Egg predation from introduced predators like rats 


By arming iwi/hapū, landowners, farmers, conservation groups, and local government with the knowledge and digital tools to monitor, protect, and restore īnanga spawning habitat, we can help turn the tide for īnanga.


NĪSP started in Northland, and has since started rolling out across the country. As funding allows, our network of national provider organisations works on the ground with locals to identify and retore habitat, one awa at a time. 


While the programme is still young, it has proved incredibly popular with conservation groups, and is easy to scale.


With the right support, we might yet be able to save the whitebait fritter.

Key Activities

  • Spawning Site Surveys – Identifying and mapping īnanga spawning habitats across Aotearoa.

  • Habitat Monitoring – Regularly checking conditions like vegetation, salinity, and tidal patterns to assess spawning success.

  • Community and Iwi Engagement – Working with local communities, hapū, and iwi to protect and manage spawning sites.

  • Data Collection and Reporting – Gathering data on spawning activity, threats, and habitat changes to inform management.

  • Digital Tool and Data Hub Development - Building a fit for purpose GIS based hub to store, map and interpret data, using good data stewardship practices.

  • Habitat Restoration Projects – Enhancing or restoring degraded spawning areas by improving riparian vegetation and stream access.

  • Training and Capacity Building – Providing tools and knowledge to community members, researchers, and councils for ongoing monitoring.

  • National Coordination and Support – Connecting regional efforts, sharing resources, and maintaining a central database for spawning sites.

Get Involved

Learn more about restoring your local īnanga spawning zone. 


If you think you have identified a natural spawning site or want to know about īnanga spawning, contact Nicholas Naysmith at Mountains to Sea via nicholas@mountainstosea.org.nz

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