The trial produced demonstrable benefits in terms of increasing the availability of high quality spawning habitat. This was reflected by the discovery of new sites, expansion of the reach known to support post-quake spawning in the Heathcote/Ōpāwaho, and a relatively high area of occupation (AOO) of spawning sites being recorded from a single month of survey. However results from egg production measurements suggest a possible adult population decline in the Heathcote/Ōpāwahoand and require follow-up to determine the actual trend using the other post-quake studies as a baseline.
Overall, the 2017 study also contributes to our understanding of New Zealand’s largest known area of īnanga spawning habitat. The factors leading to its creation are now an important topic for investigation. This will help secure gains for īnanga conservation in Christchurch City and set a useful example for the management of habitat in other waterways.
The full report can be downloaded from the CCC website here:
Response of īnanga spawning habitat to riparian vegetation management