What does it look like?
Perch can be distinguished from other species by its two dorsal fins, the first having 13–17 firm sharp spines. There is also a broad flat spine on the gill cover. Perch have six or more dark bands along their sides, and these are most prominent in small fish. The bottom edge of the caudal fin is bright red orange, as are the anal and pectoral fins. These features make perch easy to recognise.
Why is it a problem?
Perch prefer slow-flowing and still water habitats. They are strictly carnivorous and adults feed mainly on other fish. Perch have been shown to reduce the abundance of common bullies in lakes. They also reduce inanga, smelt, and crayfish in lakes where they have been introduced. At high densities, small fish predominate and can cause toxic cyanobacterial blooms.
Control methods
If you see perch or suspect its presence, please call our biosecurity team on 06 835 9200.
More information
Redfin perch belong in the Percidae family, a family of about 60 species that are native to the Northern Hemisphere. One species has become established in New Zealand, and it’s known simply as the perch. They have become well established in Otago and Southland, but also occur in many other parts of New Zealand, especially around Auckland, Waikato, and in North Island west coast lakes south of New Plymouth.
Notify Council
If you think you've found this pest, please get in touch with our Biosecurity Team at biosecurity@hbrc.govt.nz or call us on 0800 108 838.
Rules
Sports fish (Freshwater Fisheries Regulations 1983)
In accordance with the 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 Primary Industries.
