DOC's work with pest fish
Rudd
DOC has a programme of survey, education, signage and, in some situations, eradication of pest fish where it is possible. Unfortunately, once pest fish become established in a waterway it is often difficult to remove them.
Legislation/restrictions
There is a variety of legislation that governs freshwater fish in New Zealand, designed to protect our freshwater environments from alien pests.
The approval of Fish and Game New Zealand is required to hold live sportsfish and Gambusia, or introduce fish or fish eggs to sportsfish or game bird habitats.
Conservation Act 1987
To introduce any aquatic life (native or introduced fish, plants or invertebrates) into an area where they don't already occur you need a permit from the Minister of Conservation, otherwise you could be liable for a fine of $5,000. The taking and holding of some fish requires a special permit from the Ministry of Fisheries.
Unwanted Organisms (Biosecurity Act 1993)
It is illegal to release, spread, sell or breed unwanted organisms. There is a $100,000 fine or five years imprisonment for people caught doing so.
Noxious Fish (Freshwater Fish Regulations 1983)
People who possess, control, rear, raise, hatch or consign noxious fish without authority are liable for a fine of $5000. Both koi carp and rudd are classified as noxious fish, except within the Auckland/Waikato Fish and Game Region where rudd are classified as a sportsfish.