Deepwater Longtail Red Snapper

Etelis coruscans

Lutjanidae · saltwater water fish

7 minute read · Species guide

Deepwater Longtail Red Snapper field guide illustration

About Deepwater Longtail Red Snapper

Deepwater longtail red snapper, widely called onaga in Hawaiʻi, live over hard seafloor in tropical and subtropical Indo-Pacific waters. Their long pointed tail and red coloration are distinctive, but their biology is equally notable: NOAA describes fish capable of living for more than half a century.

Appearance and identification

The back and upper sides are deep pink to red, fading toward pink or white on the lower body and belly. Onaga have small teeth and proportionately large red eyes.

The tail is especially distinctive. Its lobes end in narrow, extended points, and the upper lobe becomes particularly elongated in adults. NOAA notes that the tips may be red or black, rather than white.

Sources: Longtail Red Snapper species profile

Size and lifespan

NOAA's summary gives an average length of 25 to 30 inches, with fish exceeding 40 inches. Its lifespan summary gives up to 55 years, while the biology account describes maximum ages of more than 50 years. Both descriptions identify onaga as a long-lived fish.

The agency's weight descriptions are less consistent: its quick-fact box says up to 18 pounds, while its biology text describes large fish exceeding 30 pounds. The smaller figure should therefore not be presented as an absolute maximum. These differing source figures are kept explicit rather than silently choosing one.

Sources: Longtail Red Snapper species profile

Range and habitat

Onaga occur across tropical and subtropical parts of the Indo-Pacific. NOAA's account describes them over hard ocean bottoms at depths of roughly 300 to 1,000 feet. That habitat distinguishes them from snappers commonly encountered on shallow inshore reefs.

The Pacific-island management regions in NOAA's profile identify the populations discussed by U.S. managers. They do not define the entire worldwide distribution of the species.

Sources: Longtail Red Snapper species profile

Diet and feeding

Other fishes form the main part of the diet. NOAA also lists salps, which are pelagic tunicates, and pelagic crustaceans among important prey. Their diet therefore includes animals from the water column as well as the fishes emphasized in the term piscivorous.

Sources: Longtail Red Snapper species profile

Reproduction in Hawaiian waters

For the Hawaiian Islands, NOAA describes spawning from September through December. Female maturity occurs at around 25 inches in length. The spawning season is explicitly tied to the Hawaiian account; it should not automatically be applied to every population throughout the Indo-Pacific.

A fish may become mature while still smaller than the largest adults reported for the species. Length at maturity, average adult length, and maximum observed size are separate measurements.

Sources: Longtail Red Snapper species profile

Long life and regional assessments

Onaga are evaluated within several regional bottomfish complexes rather than under one universal population estimate. NOAA describes separate assessment groupings for Hawaiʻi, American Samoa, Guam, the Northern Mariana Islands, and other Pacific island areas.

The profile reports assessed stock complexes in some regions and unknown status in others. A favorable result for one complex does not establish the condition of every onaga population. The official source lists the assessment years and regional groupings behind those distinctions.

Sources: Longtail Red Snapper species profile

Guide sources

Research reviewed 2026-10-13.

NOAA Fisheries

NOAA assessments and reference details

Length
25 to 30 inches on average but can reach over 40 inches
Weight
Up to 18 pounds
Lifespan
Up to 55 years
NOAA management region
Pacific Islands

Population status

American Samoa: Onaga is assessed as the indicator species for the American Samoa Flame Snapper and Ruby Snapper Complex (there was insufficient catch data to assess ruby snapper). The stock complex is not overfished and is not subject to overfishing (2023 stock assessment). Summary stock assessment information can be found on Stock SMART: American Samoa Flame Snapper .

Guam: Onaga is assessed as part of the 13-species Guam Bottomfish Multi-species Complex. The stock complex is not overfished and is not subject to overfishing (2024 stock assessment). Summary stock assessment information can be found on Stock SMART: Guam Bottomfish Multi-species Complex .

Commonwealth of the Northern Mariana Islands: Onaga is assessed as part of the 13-species CNMI Bottomfish Multi-species Complex. This stock complex is not overfished and is not subject to overfishing (2019 stock assessment). Summary stock assessment information can be found on Stock SMART: Northern Mariana Islands Bottomfish Multi-species Complex .

Hawaiʻi: Onaga is assessed as part of the 7-species Main Hawaiʻian Island Deep 7 Bottomfish Multi-Species Complex. The stock complex is not overfished and is not subject to overfishing (2024 stock assessment). Summary stock assessment information can be found on Stock SMART: Main Hawaiian Islands Deep 7 Bottomfish Multi-species Complex .

Northwestern Hawaiian Islands: Onaga is assessed as part of the 8-species Northwestern Hawaiʻian Islands Bottomfish Multi-Species Complex. The stock complex has an unknown overfished and overfishing status. This stock complex occurs within the Papahānaumokuākea Marine National Monument where commercial fishing is prohibited and very limited non-commercial fishing occurs.

Pacific Remote Islands Areas: Onaga is assessed as part of the 12-species PRIA Bottomfish Complex. The stock complex has an unknown overfished and overfishing status. This stock complex occurs within the Pacific Remote Islands Marine National Monument where commercial fishing is prohibited and very limited non-commercial fishing occurs.

Fishery management

Onaga is managed as part of multispecies stock complexes under these four ecosystem plans. There are annual catch limits in place for the stock complexes.

Onaga are managed through a combination of federal and local oversight. Commercial fishermen are required to have permits to fish and report their catch to NOAA fisheries or the state or territory.

Recreational fishermen fishing in federal waters for Hawaiʻi bottomfish are required to have permits and record their catch. There are no permit or reporting requirements for recreational fishermen fishing in federal waters for Guam, American Samoa, and Northern Mariana Islands bottomfish, but there are prohibited gear types and harvest techniques. Non-commercial fishing is prohibited within 12 nautical miles of emergent land within the Pacific Remote Islands Marine National Monument, unless authorized by a special permit from the U.S. Fish and Wildlife Service.

Gear restrictions and operational requirements are in place to minimize bycatch and potential gear conflicts among different fisheries.

A rebuilding plan was implemented in 2022 with the goal of rebuilding the Guam Bottomfish Multi-species Complex, of which flame snapper is a member, by 2031. The stock is no longer overfished and is making progress toward rebuilding.

Management

Onaga are managed according to requirements of the Magnuson-Stevens Act . That means management begins with data provided by the fishery or from independent studies. These data support science that tells managers if the fish stock is being fished too heavily (overfishing) and if there are too few fish left in the ocean to maintain a sustainable population (overfished). NOAA fisheries evaluates the outcome of these studies and manages the fishery to maintain fish populations to support food security, cultural practices, and sustainable local economies in the long term.

A core component of managing fisheries under the Magnuson-Stevens Act is using the best available science to determine how much fish can be caught each year. This information is implemented as catch limits. The decisions about what catch limits are appropriate is the result of discussions by a regional fishery management council .

The Western Pacific Regional Fishery Management Council includes fishermen and other knowledgeable community representatives from each island area, along with regional government managers and NOAA Fisheries, the U.S. Coast Guard, and the U.S. Fish and Wildlife Service. They meet three or four times a year in a public forum to discuss, debate, and make recommendations for management to NOAA Fisheries. In addition to catch limits, additional regulations are in place to protect habitats and fish populations through the prohibition of destructive or non-selective fishing gear in the Pacific Islands region.

NOAA Fisheries evaluates Council recommendations to ensure they are consistent with relevant federal laws and Executive Orders. If recommendations meet these requirements, NOAA Fisheries initiates rulemaking through a public notice and comment period.

Science

Under the Magnuson-Stevens Act , the Pacific Islands Fisheries Science Center is responsible for conducting stock assessments of the bottomfish management unit species, including onaga. These assessments are used to determine stock status from which the Western Pacific Fishery Management Council recommends annual fishery catch limits. In the Pacific Islands Region, NOAA researchers monitor the catch of bottomfish through commercial catch reports, creel surveys, life history surveys, and collaborating with local fishermen as part of the Bottomfish Fishery-Independent Survey . These annual surveys have been done operationally in Hawaiʻi for several years to assess the numbers and sizes of bottomfish around the main Hawaiian Islands and provide biological samples for life history research. NOAA Fisheries is working to expand these surveys to other areas. The science center has continually strived to improve data used in stock assessments and is working toward a single-species assessment for species where adequate data is available.

Our research of the Main Hawaiian Islands Deep 7 Bottomfish group

Range

Where it lives

Share of 32 GBIF observation records with a state location, across 1 states.
0%
100%
Share of 32 GBIF observation records with a state location, across 1 states.

Share of records by state

Habitat

Water and movement

Water
WoRMS records this species in the sea.

Classification

Taxonomy

Kingdom
Animalia
Phylum
Chordata
Superclass
Actinopterygii
Class
Teleostei
Order
Perciformes
Genus
Etelis
Species
Etelis coruscans
ITIS TSN
168905
WoRMS AphiaID
212544
GBIF key
2385135
Outside the US
ITIS also files it in Central Pacific Territories.

Common questions about Deepwater Longtail Red Snapper

What is the scientific name of Deepwater Longtail Red Snapper?
The scientific name is Etelis coruscans, in the family Lutjanidae. Classification follows ITIS.
Does Deepwater Longtail Red Snapper live in fresh water or salt water?
WoRMS records this species in the sea.
Where has Deepwater Longtail Red Snapper been recorded in the United States?
GBIF has observations in 1 states, with the most records in Hawaii. The map shows observation records, which do not establish the complete natural range.
How long does Deepwater Longtail Red Snapper live?
NOAA Fisheries lists its lifespan as Up to 55 years.
How big does Deepwater Longtail Red Snapper get?
NOAA Fisheries lists its length as 25 to 30 inches on average but can reach over 40 inches and its weight as Up to 18 pounds.

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