Sablefish
Sablefish
Anoplopoma fimbria
Also Known As
Black cod, Butterfish, Skil, Beshow, Coalfish,
Butterfish Skil,
Beshow,
Coalfish
Quick Facts
Length
2 to 3 feet
Lifespan
Up to 90 years
Region
Alaska,
West Coast
Sablefish swimming just above the sea floor. Credit: NOAA's Northwest Fisheries Science Center
About the Species
Sablefish are a deepwater species native to the Pacific Northwest and Alaska. They are a tasty source of protein, rich in omega-3 fatty acids, and fetch a high price in local markets. Sablefish have been identified as a potential species for commercial farming in the Pacific Northwest, where they are the target of a sustainably managed commercial and recreational fishery. The United States currently does not produce farmed sablefish, but researchers are experimenting with raising them in hopes of creating a viable commercial aquaculture industry.
Location
- Sablefish are found in the northeastern Pacific Ocean from northern Mexico to the Gulf of Alaska, westward to the Aleutian Islands and into the Bering Sea.
- There are two populations in the Pacific Ocean:
- Northern population inhabits Alaska and northern British Columbia waters.
- Southern population inhabits southern British Columbia, Washington, Oregon, and California waters.
- Both populations mix off southwest Vancouver Island and northwest Washington.
- They are most commonly found in Alaska waters.
Appearance
- Sablefish look much like cod. They are often referred to as black cod, even though they are not actually part of the cod family.
Biology
- Females can grow more than 3 feet in length.
- Females are able to reproduce at 6 ½ years old and more than 2 feet in length.
- Males are able to reproduce at age 5 and 1.9 feet in length.
- Sablefish spawn in deeper water along the continental slope from January to April in Alaska waters, and from January to March between California and British Columbia.
- Eggs develop in deep water for about 2 weeks until they hatch, then rise to the surface.
- Hatched larvae are moved by surface currents.
- Off southeast Alaska and British Columbia, juveniles appear in nearshore waters by fall.
- Juveniles have been found to migrate more than 2,000 miles in 6 or 7 years.
- Sablefish can live to be more than 90 years old.
Where They Live
Range
- Sablefish are found in the northeastern Pacific Ocean from northern Mexico to the Gulf of Alaska, westward to the Aleutian Islands and into the Bering Sea.
- There are two populations in the Pacific Ocean:
- Northern population inhabits Alaska and northern British Columbia waters.
- Southern population inhabits southern British Columbia, Washington, Oregon, and California waters.
- Both populations mix off southwest Vancouver Island and northwest Washington.
- They are most commonly found in Alaska waters.
Habitat
- Adults live on mud bottoms in waters deeper than 650 feet.
- Juveniles live throughout the water column in nearshore waters.
Scientific Classification
- Sablefish are found in the northeastern Pacific Ocean from northern Mexico to the Gulf of Alaska, westward to the Aleutian Islands and into the Bering Sea.
- There are two populations in the Pacific Ocean:
- Northern population inhabits Alaska and northern British Columbia waters.
- Southern population inhabits southern British Columbia, Washington, Oregon, and California waters.
- Both populations mix off southwest Vancouver Island and northwest Washington.
- They are most commonly found in Alaska waters.
- Adults live on mud bottoms in waters deeper than 650 feet.
- Juveniles live throughout the water column in nearshore waters.
Scientific Classification
| Kingdom | Animalia | Phylum | Chordata | Class | Actinopterygii | Order | Scorpaeniformes | Family | Anoplopomatidae | Genus | Anoplopoma | Species | fimbria |
|---|
Featured News
Snow capped mountains reflect off the waters of the Prince William Sound in the Gulf of Alaska. Credit: NOAA Fisheries.
The NOAA Aquaculture Strategic Plan (2023–2028) includes goals and objectives to sustainably develop the aquaculture industry in the United States. Credit: NOAA Aquaculture Program
All organisms shed DNA into the environment. Environmental DNA (eDNA) can be used to determine the identities of the fish species that are present at or near the time of sample collection. Credit: NOAA Fisheries
Young sablefish. Credit: NOAA Fisheries.
Seafood Facts
Is Sablefish Sustainable?
U.S. wild-caught sablefish is a smart seafood choice because it is sustainably managed and responsibly harvested under U.S. regulations.
Availability
Year-round.
Source
Wild-caught off Alaska, Washington, Oregon, and California. U.S.-farmed sablefish is not currently available commercially.
Taste
Sablefish have high oil content, making them exceptionally flavorful. They are often called butterfish because of their melt-in-your-mouth, oil-rich meat.
Texture
Soft, velvety texture. Their meat has large, white flakes.
Health Benefits
Very high in long-chain omega-3 fatty acids, EPA, and DHA.
Nutrition Facts
Servings: 1; Serving Weight: 100 g (raw); Calories: 195; Protein: 13.41 g; Total Fat: 15.3 g; Total Saturated Fatty Acids: 3.201 g; Carbohydrate: 0 g; Total Sugars: 0 g; Total Dietary Fiber: 0 g; Cholesterol: 49 mg; Selenium: 36.5 mcg; Sodium: 56 mgSeafood News
Seafood stall at Tuna Harbor Dockside Market in San Diego. Photo credit: Ron Batcher
NOAA Administrator, Dr. Richard Spinrad, and NOAA Fisheries Assistant Administrator, Janet Coit, with representatives from the Intertribal Agriculture Council at Seafood Expo North America 2023 in Boston. Credit: NOAA Fisheries.
Aquaculture
U.S. wild-caught sablefish is a smart seafood choice because it is sustainably managed and responsibly harvested under U.S. regulations.
Environmental Impact
Federal and state regulations and monitoring requirements ensure that sablefish farming (as practiced in the United States) has minimal impact on the environment.
Feeds
Farmed sablefish are incredibly efficient at converting feed to edible protein. Alternative feeds have been developed to reduce reliance on fish meal and fish oil from forage fish.
Farming Methods
Sablefish are spawned and raised in land-based hatcheries until large enough for transfer to net pens.
Human Health
Sablefish are rich in omega-3 fatty acids. Antibiotic use is strictly limited in the United States and is prescribed only on a case-by-case basis by an on-site veterinarian.
Production
Production
- The United States currently does not produce farmed sablefish commercially. However, with the species popularity and prized taste there is a growing interest in commercial farming.
Environmental Considerations
- Water quality and benthic impacts:
- Impacts to the environment can occur around fish farms when organic nutrients from uneaten food and fish waste exceed the capacity of the ecosystem to assimilate them.
- Potential environmental impacts are largely avoided with proper farm siting, husbandry, management, and modern technologies.
- Modeling interactions of farms and the environment can help guide decisions about siting locations.
- Fish farms in the United States are required to meet waste discharge standards under the Clean Water Act.
- When farms are sited in well-flushed water, nutrient enrichment in the water column is generally not detectable.
- Proper siting in well-flushed erosional sea floors, and practices such as fallowing, control the impact of fish farms on the benthic environment.
- Escapes:
- On rare occasions farmed fish escape and can possibly interact with their wild counterparts.
- Federal and state permits require containment management systems at all marine sites.
- NOAA is using models to understand the risk of escaped fish affecting the genetic diversity of wild populations.
Animal Health
Animal Health
- Management and remedies:
- Fish diseases occur naturally in the wild, but their effects go unnoticed because dead fish quickly become prey.
- Vaccines, probiotics, limiting farming density, high-quality diets, and controlled use of antibiotics prevent bacterial diseases in fish.
- Management of viral infections occurs through thorough monitoring, healthy culture conditions, low stress environments, and good nutrition and genetics.
- Parasites are controlled on farms using therapeutants, fallowing farm sites, and pest management such as the use of cleaner wrasses.
- Most states have comprehensive aquatic animal health regulations, such as routine health exams by veterinarians.
- Antibiotic use:
- In the United States, antibiotics may only be used to treat bacterial infections in marine fish under direction of a veterinarian on a case-by-case basis.
- Antibiotics are considered a method of last resort and cannot be preemptively fed to fish.
- Special permits obtained from the Food & Drug Administration may be required.
- Vaccines have been effective in reducing, and in some cases eliminating, the need for antibiotics.
Human Health
- Contaminants:
- Aquaculture feed is regulated and monitored by the FDA and state agencies to ensure feeds are not contaminated with heavy metals or methyl mercury.
- Both wild and farmed seafood contain low levels of polychlorinated biphenyls (PCBs).
- PCB levels in farmed sablefish are orders of magnitude below the FDA lower limit.
- Health benefits:
- Like wild sablefish, farmed sablefish contain high levels of omega-3 fatty acids.
Science Overview
NOAA Fisheries conducts various research activities on the biology, behavior, and population health of sablefish. The results of this research are used to inform management decisions for this species. For detailed information about stock status, management, assessments, and resource trends, you can search for sablefish, and any other species of interest, using NOAA’s StockSMART web tool.
Sablefish Research in Alaska
Scientists at NOAA’s Alaska Fisheries Science Center and Northwest Fisheries Science Center assess the abundance of sablefish in their region through annual longline surveys and trawl surveys every one to three years. Sablefish data are also collected by fishery observers and through required and voluntary logbook programs.
NOAA Fisheries has been tagging and releasing sablefish in Alaskan waters since 1972. Although the results of longline surveys are the primary data used to determine sablefish quotas, tag data provide complementary information that enhances survey data. For example, using data from the tagging program, scientists have discovered that sablefish are highly migratory and that their migration can affect the amount of fish available for harvest in an area.
Learn more about Sablefish research in Alaska
Researching Farmed Sablefish
Aquaculture Management
NOAA collaborates with a variety of partners to research new and evolving techniques for farming sablefish sustainably. For example, the National Ocean Service’s CASS Program assesses aquaculture environmental interactions and develops spatial planning and eco forecasting tools. NOAA Fisheries and partners also work on the OMEGA Model to assess risk and develop management approaches that address the genetic and ecological effects of escaped fish on wild fish of the same species.
Growth and Reproduction
The Northwest Fisheries Science Center’s Manchester Research Station has been exploring techniques to produce all-female sablefish stocks, which grow significantly faster than males. They have also been developing sablefish larval rearing techniques to reduce the cost and duration of rearing, and studying sablefish genetics to understand how fish grow, resist disease, and mature.
The Southwest Fisheries Science Center has been using genetics and genomics to evaluate broodstock selection and investigate how genetics of reared fish relate to health and fitness.
Research & Data
More Information
- Alaska Sablefish Fisheries and Assessments
- Alaska Sablefish Tagging Program
- Fish Out of Water: How Capture Affects Sablefish Health, Reflexes, and Survival
- Observations of Fine-Scale Juvenile Sablefish Movements Reveal Behavioral Patte…
- Research Findings Lead to a More Optimistic Picture of Sablefish
