Fisheries

Black petrels are relatively few in number and are sometimes caught on fishing lines and in nets. The effect of fishing-related deaths on the population is unknown.

Low recruitment could also be caused by widespread depletion of stocks

The movements of many juvenile native fish are often hindered by barriers to fish passage such as dams, weirs, falls, tide gates, culverts, screens and high water velocities. The New Zealand Fish Passage Guidelines sets out recommended practice for the design of instream infrastructure to provide for fish passage.

The tools available for restoring native fish to streams depend on what is causing fish to decline.

Identifying the factors causing fish numbers to drop will allow you to determine which restoration tools you need to employ.

The giant kōkopu is a native whitebait species considered rare and vulnerable. NIWA is working with Mahurangi Technical Institute and environmental consultancy Boffa Miskell to test the feasibility of reintroducing giant kōkopu to Nukumea Stream, north of Auckland.