Halibut Fishing in Alaska – Unraveling the Mysteries of the Alaskan Halibut

Alaskan halibut are found on the continental shelf of the North Alaskan Ocean and Bering Sea. They have been recorded on the North American coast from Santa Barbara, California to Nome, Alaska and are also found along the Asiatic coast from the Gulf of Anadyr, Russia to Hokkaido, Japan.

Alaskan halibut live on or near the ocean bottom, and prefer water temperatures ranging from 4 to 9° Celsius. Although halibut have been caught as deep as 547 meters, they are most often caught in waters from 28 to 275 meters in depth.

Alaskan halibut belong to a family of flounders called Pleuronectidae. They're among the largest fishes in the world with reported lengths up to 2.7 meters. Alaskan halibut have flat, diamond-shaped bodies and are able to migrate long distances.

Most adult fish tend to remain on the same summer feeding grounds year after year, however they make regular seasonal migrations from more shallow feeding grounds in summer to deeper spawning grounds in winter. These spawning migrations can cover hundreds of miles in north-south or east west directions. Halibut spawn in deep water. As larvae develop, they drift slowly upward in the water column and drift great distances with the ocean currents in a counter-clockwise direction around the Northeast Alaskan Ocean.

After spending two or three years in nursery areas in the Northeast Pacific, young
Alaskan halibut tend to migrate to more southerly and easterly waters. Halibut size is not age-specific, but rather tends to follow a cycle related to halibut abundance. Average fish size reflects density dependence in growth rate, where slower growth is associated with higher halibut abundance. From November to March, mature halibut concentrate annually on spawning grounds along the edge of the continental shelf at depths from 183 to 457 meters. Major spawning sites in Alaska include Yakutat, Cape Suckling-Yakataga, Portlock Bank, and Chirikof Island. Spawning concentrations also occur in the Bering Sea. In addition to these major spawning grounds, spawning is thought to be widespread and occurs in many areas, although concentrations are not as dense as those at grounds mentioned above.

The current trend is one of decline due to high stock abundance, and fish today are smaller than fish of the same age 10 years ago, not over fishing as many claim.
Maturity varies with sex, age, and fish size. Females grow faster but mature slower than males. Most males are mature by eight years of age, whereas females on average mature at about 12 years of age. We hope this information will help you appreciate this incredible species next time you are halibut fishing in Alaska.