Pacific ocean perch
A deep-water red rockfish of the North Pacific.
The Pacific ocean perch is a slow-growing, long-lived rockfish found across the North Pacific. It lives in deep offshore waters and supports commercial fisheries, with stocks managed due to past overfishing.
- Can live up to 98 years in Alaskan waters.
- Releases live young instead of laying eggs.
- Found at depths of 150 to 420 metres.
- Spines do not contain venom unlike relatives.
- Diet consists mainly of krill and copepods.
What it is
This fish has a compressed body that tapers toward the tail. Adults display red colouring, ranging from deep to light shades, often with dark markings on the back. A large mouth features a lower jaw that extends beyond the upper one. The dorsal fin contains about thirteen spines and soft rays, forming a rounded shape. Three spines sit near the anus, and the tail fin is flat with a slight central indent. It belongs to the Scorpaeniformes order, which includes scorpionfish, though its spines lack venom.
Where it lives
Its distribution covers the North Pacific, stretching from northern Honshū in Japan to La Jolla in California. The range includes the Bering Sea and Aleutian Islands but excludes the Sea of Okhotsk. Adults inhabit offshore areas on the continental shelf and upper slope, typically at depths between 150 and 420 metres. They prefer water temperatures of 4 to 7 °C. Seasonal shifts occur, with fish moving to shallower depths in summer and deeper waters in winter.
How it lives
Juveniles live in rocky, inshore areas before migrating deeper as they mature. They are planktivorous, feeding on krill, copepods, and amphipods. Larger individuals also consume mysids and small fish such as myctophids. They often feed at night, following prey migrations off the sea floor. Predators include sablefish, Pacific halibut, sperm whales, seabirds, and other large fish. They form patchy aggregations rather than uniform schools.
Breeding and life cycle
The species is viviparous, meaning eggs develop internally with nourishment from the mother. Mating occurs in autumn, with sperm stored until fertilisation two months later. Larvae are released in April or May. Young drift in ocean currents before settling in shallow, rocky habitats. Sexual maturity varies, with some fish maturing as early as age seven, though many take longer. The reproductive cycle involves a long development period followed by a short resting phase.
Fish and people
Commercial fisheries target this species using trawls. Catches increased significantly in the mid-twentieth century, particularly by foreign fleets in the Gulf of Alaska. This heavy harvesting led to stock declines and subsequent management measures. It is valued as a food fish. Sport fishing also occurs, though it is less prominent than commercial activity. The fishery developed along the US West Coast and into the Bering Sea.
Status and threats
The population is slow-growing with low natural mortality and late maturity. Overfishing in the 1960s severely reduced numbers, prompting conservation efforts. Age-truncation from fishing removes older, more fecund individuals, which may harm recruitment. Genetic studies suggest distinct local populations, complicating management. Current status assessments focus on maintaining sustainable harvest levels given the species' long lifespan and episodic recruitment patterns.
Questions people ask about Pacific ocean perch
Is the Pacific ocean perch a true perch?
No, despite its name, it is not part of the Perch order. It belongs to the Scorpaeniformes order, which includes scorpionfish and rockfish. Its common name is a misnomer based on appearance rather than taxonomy.
How deep does this fish live?
Adults are primarily found on the outer continental shelf and upper slope. They inhabit depths ranging from 150 to 420 metres, moving shallower in summer and deeper in winter.
Does it lay eggs?
No, it is viviparous. The eggs develop internally, receiving nourishment from the mother. Fertilised eggs hatch inside the female, who then releases live larvae into the ocean in spring.
What is the maximum size?
The species can grow up to 21.2 inches in length and weigh up to 4.5 pounds. Most commercial catches are smaller, but these represent the upper limits for adults.
Good reading and sources
- Pacific ocean perch on WikipediaEncyclopedia
- More photos on Wikimedia CommonsPhotos
- Wikidata recordOpen data
The facts on this page come from the Wikipedia article "Pacific ocean perch", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.
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