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Fish Passage & Remediation

Over five years, Kūmānu’s fish passage team worked across rivers, streams, wetlands and rural waterways throughout Tasman to help native freshwater fish move more freely through the habitats they rely on.

Delivered on behalf of Tasman District Council (TDC), the project focused on in-stream structures such as culverts, fords, weirs and small bridges. These structures are part of everyday infrastructure, but when they are too steep, fast-flowing, damaged or poorly positioned, they can become barriers for fish trying to move through a waterway.

For our team, the work meant getting out across a large and varied region. They assessed sites on farms, roadsides, reserves, urban streams and rural waterways, often working in places that many people would drive past without noticing.

The project combined field experience with technical tools and practical judgement. The team used GIS mapping, aerial imagery and field data collection to locate and assess structures, then worked through the best response for each site. In some places, that meant small-scale remediation. In others, it meant monitoring, recording information or working with technical specialists to support future decisions.
Location: Nelson
Client: Tasman District Council

Services:
Across the five-year programme, Kūmānu delivered:
• 6,477 fish passage assessments
• 1,021 barriers remediated
• 25,900 project hours
• 14 people trained

At many sites, practical improvements included installing mussel spat rope, rubber aprons or flexible baffles to help fish move through difficult structures. These are not always large or highly visible interventions, but they can make a real difference in helping reconnect freshwater habitats.

Just as important as the technical work was the way the team worked with people. Many sites were on or near private land, so the project relied on careful communication, trust and respect for landowners, property, safety and the environment. That approach helped the team cover a wide geographic area while maintaining positive relationships across local communities.

The project was strengthened through collaboration with Ngā Iwi o Te Tauihu o Te Waka a Māui, Tasman District Council, and technical partners including Olleycology Ltd, ATS Environmental, Cawthron Institute, Seamless and NIWA.

The information gathered through the project will continue to support freshwater restoration and catchment planning across Tasman, giving councils, iwi, landowners, catchment groups and community-led projects better information for future work.
For Kūmānu, this project shows the value of skilled people doing practical environmental work with care. It brought together field knowledge, technical capability, local relationships and a commitment to healthier waterways.

Small improvements across a waterway network can add up to meaningful change for native fish, freshwater ecosystems and the communities connected to them.

Care and capability in action. 

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