Atmospheric analysis

It is thought freshwater eels were originally marine fish which adapted to live most of their lives in fresh water, and that the present distribution of the 18 species of freshwater eel is largely a result of continental drift.

The main aim of the surveys is to estimate the abundance of hoki and other commercially important species (such as hake and ling), but during the 20 consecutive surveys NIWA scientists have also been able to study other aspects of deepwater biodiversity on the Chatham Rise, including fish distribution, abundance, and ecology.

Showcasing tuna research and restoration initiatives being undertaken around New Zealand.

Finding and collating information that already may exist for the lake, river or stream you are interested in, choosing the right sampling methods, and making sure that the data you work hard to collect is stored safely are all important things to consider in your monitoring programme.

There are a range of different sampling methods which can be used, including electric fishing, fyke nets, Gee-Minnow traps, scoop nets, whitebait nets and observation.

Site selection and timing are important factors to consider when designing a representative sampling strategy .

Defining your research questions is the first place to start when designing a survey.

In this section, we look at defining your research questions, site selection and timing, sampling methods, and considerations for data collection.

Since NIWA was established as a Crown Research Institute in 1992, the organisation has been fortunate to receive funding to undertake research that continues to increase our understanding of a fascinating and incredibly important taonga freshwater fish.

Shortfin and longfin eels are an important resource from both a human/cultural use and biodiversity perspective.