Invasive Fish

Over one-quarter of the freshwater fish species present in New Zealand have been introduced from overseas. Like all introduced species, they have some impact on native ecosystems, but some cause more problems than others. These invasive fish are most widespread and abundant in the northern half of the North Island where they can have a range of potential adverse effects on freshwater ecosystems. These effects are likely to become more significant and widespread in the face of human population growth and climate change which both have the potential to increase the distribution of these species.

Our research aims to:

  1. Understand the biology and abundance of invasive fish in New Zealand
  2. Quantify their ecological impacts on freshwater ecosystems, and
  3. Develop methods to assist with their control and monitoring.