Butterfly Perch – hovers near the rocky reef drop-offs

hovers near the rocky reef drop-offs

Size: Length: 20–30 cm, Weight: 200–500 g
Lifespan: 8–12 years
Diet: Carnivorous feeding on small crustaceans zooplankton and fish larvae. Hovers in mid-water picking drifting prey using protrusible mouth in loose schools near rocky reefs.
Habitat: Rocky reefs and kelp forests from shallow waters down to 100 metres depth. Prefers areas with strong currents and clear water. Often found near drop-offs and underwater pinnacles.
Range: Found in coastal waters of North and South Islands from Northland to Stewart Island. Most common around offshore islands and rocky headlands. Also found in southern Australia and Tasmania.
Endemism: Native
Main Threats: Bycatch in commercial rock lobster pots and set nets is primary threat. Also threatened by localised declines near urban areas climate change affecting kelp habitat and potential overfishing.
Population: Populations considered stable across most of species' range. Localised declines have occurred in heavily fished inner harbours. Species benefits from marine protected areas. Requires ongoing monitoring.
Conservation Status: Not Threatened
Human Risk: harmless
Handling Note: native perch, harmless to humans, leave undisturbed
Conservation Note: Native marine fish; not assessed by NZTCS as marine fish are outside the scope of current threat classifications.
Te Ao Māori: In Māori tradition Oia was a fish of the rocky shores. Its bright colours were a sign of clean clear water and healthy reef systems. It was sometimes caught in hīnaki (pots). It was not a primary food source due to its small size. The name Oia reflects its darting restless movements. It appears in some coastal stories as a messenger of the reef. Its bright colours signal that the water was clean and the fish were abundant. This association links the species to environmental health. Mana whenua observe these indicators closely.

Stunning pink and orange fish with delicate fins that flutter like wings. It looks like it belongs in a butterfly house. The body is compressed and oval-shaped. It has a small head and a terminal mouth. The colour is a brilliant pink or orange on the back. This fades to silver on the belly. The fins are delicate and translucent. Long flowing rays extend from them. The scales are small and smooth. A fish that wears its colours like a flower. It is a mid-water predator. It hovers in loose schools above rocky reefs. It feeds on small crustaceans zooplankton and fish larvae. It picks them from the water column with its protrusible mouth. It does not chase its prey. It hovers and picks. A fish that is patient. Males are more brightly coloured than females. During the breeding season the males display their colours to attract mates. The colour fades outside the breeding season. This makes the sexes difficult to distinguish. It is a common resident of offshore islands and rocky headlands. It is most abundant in areas with strong currents and clear water. The plankton is plentiful there. Not targeted by commercial fisheries it is occasionally caught as bycatch in rock lobster pots and set nets. It is also taken by recreational fishers. It is not a prized catch due to its small size. To see one is to see a flash of pink in the kelp. The kelp forest is green. The butterfly perch hovers pink and orange delicate fins fluttering. The current flows. The perch drifts. It does not know it is beautiful. It does not know it looks like a butterfly. It just wants to eat plankton. In Māori tradition Oia was a fish of the rocky shores. Its bright colours were a sign of clean clear water and healthy reef systems. It was sometimes caught in hīnaki (pots). It was not a primary food source due to its small size. The name Oia reflects its darting restless movements. It appears in some coastal stories as a messenger of the reef. Its bright colours signal that the water was clean and the fish were abundant. The butterfly perch endures. It moves through the water unaware of its beauty. Unconcerned with its reputation. Focused on survival. And the next meal. In the waving green expanse. Where it belongs. No one told it otherwise.