Restoring connectivity for migratory native fish in a New Zealand stream: effectiveness of retrofitting a pipe culvert
Version of Record online: 23 APR 2012
Copyright © 2012 John Wiley & Sons, Ltd.
Aquatic Conservation: Marine and Freshwater Ecosystems
Volume 22, Issue 4, pages 489–497, June 2012
How to Cite
Franklin, P. A. and Bartels, B. (2012), Restoring connectivity for migratory native fish in a New Zealand stream: effectiveness of retrofitting a pipe culvert. Aquatic Conserv: Mar. Freshw. Ecosyst., 22: 489–497. doi: 10.1002/aqc.2232
- Issue online: 3 AUG 2012
- Version of Record online: 23 APR 2012
- Manuscript Accepted: 23 JAN 2012
- Manuscript Revised: 17 JAN 2012
- Manuscript Received: 8 AUG 2011
- New Zealand Foundation for Research Science and Technology. Grant Number: CO1X0305
- taxon richness;
- urban development;
- Restoring longitudinal connectivity is a key river restoration goal. This study tested the efficacy of a fish ramp and spoiler baffles for restoring indigenous fish communities upstream of a culvert.
- Before–after monitoring showed that installation of the ramp and spoiler baffles increased species richness (mean increase 80%) and total fish density (mean increase 45%) upstream of the culvert.
- Passage trials on the ramp and baffled culvert were carried out using inanga, Galaxias maculatus (Jenyns), a commonly occurring weak-swimming migratory fish. The trials showed that inanga were capable of successfully ascending both the ramp (overall 27.1% success) and culvert with baffles (overall 6.2% success) under the conditions tested (cf. 0% success for this species before retrofitting), but passage efficiency was still relatively low in both cases.
- Retrofitting of culverts can therefore be effective for restoring upstream fish passage. However, to maximize effectiveness it is essential that restoration goals are well defined and retrofitting solutions are designed appropriately for the target species. Copyright © 2012 John Wiley & Sons, Ltd.