Yellowtail amberjack

What it is

This large fish belongs to the jack family and inhabits ocean waters. Adults display a streamlined body shape suited for fast swimming. Young specimens show bright yellow colouring with dark bands, which fade as they mature. By the time they reach thirty centimetres, they adopt the uniform adult appearance. They grow significantly, with maximum lengths reaching one hundred and eighty centimetres. Large individuals caught in South Australia have weighed up to fifty kilograms.

Where it lives

Populations thrive in tropical and temperate zones across the Southern Hemisphere. Records extend from Queensland down to Tasmania in Australia. They also occur in the northern Pacific Ocean. These mobile creatures prefer water temperatures between seventeen and twenty-four degrees Celsius. They inhabit rocky reefs, sandy bottoms near coasts, and offshore islands. While usually found at depths under fifty metres, some have been caught much deeper.

How it lives

Active predators hunt in schools or pairs. Their diet includes smaller fish like mackerel and pilchards, plus squid and prawns. In New Zealand waters, they are major predators and have even eaten seabirds. Juveniles hide among floating debris or weed for camouflage. Adults often accompany stingrays, using the rays' electroreception skills to locate prey. They show curiosity around boats and human activity in harbours.

Breeding and life cycle

Wild reproductive habits remain poorly understood. Aquaculture relies on hatchery-produced juveniles rather than wild capture. Captive breeding stocks provide the young fish for farming operations. This method contrasts with other amberjack species where wild juveniles are more readily available for culture.

Fish and people

Early settlers in New Zealand considered the flesh coarse, but views changed. It is now a prized sport fish and commercial target. Known as hiramasa, it features prominently on sashimi menus globally. Māori tradition calls it haku and associates it with leadership qualities. Traps once decimated populations in Sydney Harbour until bans protected them. Farming occurs in Australia, Chile, and planned facilities in the United States.

Status and threats

Commercial traps in Sydney Harbour previously removed large portions of the local population. Regulatory bans in the mid-1990s helped recover numbers. Aquaculture expansion faces challenges regarding water quality and stock mortality. Environmental concerns persist around farm discharges in sensitive gulf areas.

Relatives and look-alikes

Genetic studies distinguish this species from similar northern hemisphere forms. FishBase sometimes groups North Pacific populations here, but others classify them separately as Seriola aureovittata. The northeastern Pacific form is often called Seriola dorsalis. Confusion exists due to physical similarities across these related taxa.

Questions people ask about Yellowtail amberjack

Good reading and sources

• Yellowtail amberjack on WikipediaEncyclopedia
• More photos on Wikimedia CommonsPhotos
• Wikidata recordOpen data