News & Updates
Focus On Maintaining Fish Passage During Low Flows
It is worth remembering that lows flows and shallow water are challenges to migrating fish. The video below represents remediation to an upgraded urban storm water pipe serving a small tributary of the Maitai River near Nelson, NZ. The upgrade involved...
Climbing Redfin
Tim Olley captured this rare footage of a juvenile redfin bully (Gobiomorphus huttoni) climbing up a retro-fitted mussel-rope with backing, into an overhanging culvert. It reminds us that, given half a chance, many fish will navigate challenging obstacles. What is not...
Reservoir Video
Below is one of Tim's videos featuring the culvert remediation project in the recently published "Lessons Learnt 8". There is some great underwater footage showing how fish navigate upstream utilizing the back-eddies and rest pools created by the flexible baffles. For...
GIS Project
Jordie McDonald has completed a desktop GIS project highlighting the huge number of potential barriers to fish passage in the Northland Region of New Zealand. The extent of the potential barriers is probably typical around NZ the rest of the world....
Lessons Learnt 8
The NZ Dept Conservation Fish Passage Advisory Group website has a number of Lessons Learnt describing different fish passage remediation projects. Tim Olley spent over a year researching and putting together this comprehensive report highlighting the effectiveness of...
RIPRAP Followup
We received heaps of thoughtful feedback from engineers and ecologists regarding the last mail-out, so we have summarized the comments below. The projects in question are typically the often steep outfalls from culverts or other structures, as opposed to stream...