Thunnus obesus , also known as Tuna, Big eye, Ahi-b. U.S. wild-caught Atlantic bigeye tuna is a smart seafood choice because it is sustainably managed and responsibly harvested under U.S. regulations.
Source: Species facts, status language, and imagery adapted from the NOAA Fisheries species profile (last updated 07/02/2026). Ocean City charter and Maryland
record notes are editorial orientation for OCEANCITY.MD readers. Always confirm current seasons, sizes, and
bag limits before you fish—rules change.
Maryland’s Atlantic recreational seasons/sizes/creel summary does not publish a dedicated line for Atlantic Bigeye Tuna. Verify COMAR, DNR public notices, and federal rules for your exact waters before you keep fish.
Rule
Maryland / applicable detail
Maryland minimum size
Not listed — no dedicated Atlantic Bigeye Tuna line on the MD Atlantic recreational table
Maryland daily creel (bag)
Not listed — no MD species-specific bag for Atlantic Bigeye Tuna
Maryland open season
Not listed on the MD Atlantic Ocean / Coastal Bays summary table
Verify
Check DNR eRegulations, COMAR, and NOAA for your date and coordinates before you keep fish.
Bigeye tuna are dark metallic blue on the back and upper sides and white on the lower sides and belly.
The first fin on their back is deep yellow, the second dorsal and anal fins are pale yellow, and the finlets are bright yellow with black edges.
Bigeye and yellowfin tuna look fairly similar.
In fact, it’s hard to distinguish the two species without experience.
Among other characteristics, the bigeye’s eyes are larger than the yellowfin’s and their finlets have black edges.
Biology Bigeye tuna grow fast and can reach about 5.5 feet in length.
Appearance
Bigeye tuna grow fast and can reach about 5.5 feet in length.
They can live up to 9 years and are able to reproduce when they are 3.5 years old.
Bigeye tuna spawn throughout the year but most often in the summer.
They usually spawn two or more times a year.
Females release between 3 million and 6 million eggs each time they spawn.
Bigeye tuna feed near the top of the food chain, preying on fish, crustaceans, and squid.
They are prey for many top predators, including sharks, billfish, larger tunas, and toothed whales.
Where They Live Range Bigeye tuna live in the tropical and warm temperate waters of the Atlantic, Pacific, and Indian Oceans.
In the western Atlantic, they can be found from Southern Nova Scotia to Brazil.
Habitat Bigeye tuna are a highly migratory species, swimming long distances throughout the ocean.
They often swim in schools and live at or near the surface but dive into deeper waters (to about 800 feet, deeper than other tropical tunas) during the day.
Larvae are found in tropical waters, and as juvenile fish grow larger they tend to move into temperate waters.
As juveniles they often school with yellowfin and skipjack tunas at the surface, especially in warm waters.
Fishery Management NOAA Fisheries and the Atlantic Highly Migratory Species Division manage the Atlantic bigeye tuna fishery in the United States.
Managed under the 2006 Consolidated Atlantic Highly Migratory Species Fishery Management Plan : Commercial fishermen must have a permit to harvest bigeye tuna Gear restrictions Time/area closures Minimum size limit Federal management for Atlantic tunas applies to state waters as well, except in Maine, Connecticut, and Mississippi.
NOAA Fisheries periodically reviews these states’ regulations to make sure they’re consistent with federal regulations.
Highly migratory species, such as bigeye tuna, have complicated management that requires international cooperation.
The United States participates in regional fisheries management organizations, such as the International Commission for the Conservation of Atlantic Tunas (ICCAT), to enhance tuna management worldwide and promote the rigorous stewardship standards followed by our own U.S. fishermen.
NOAA Fisheries sets regulations for the U.S. western Atlantic bigeye tuna fishery based on our science as well as conservation and management measures adopted by ICCAT.
ICCAT conservation and management recommendations include: An annual total allowable catch of 61,500 metric tons in 2021 allocated among major harvesters, sharing arrangements for member countries, minimum size limits, effort controls, time/area closures, trade tracking requirements, compliance measures, and monitoring and inspection programs.
ICCAT remains concerned about unreported catches and is actively working to improve statistics by working with tuna canneries in West Africa.
Since 2011, ICCAT has also instituted numerous requirements related to catch reporting and measures to manage the use of fishy aggregating devices.
The United States has strongly advocated for management measures at ICCAT to end overfishing and rebuild the stock.
NOAA Fisheries will continue to work with ICCAT to develop effective measures to end overfishing and to implement an international rebuilding program.
In 2000, the United States established the Dolphin-Safe Tuna Tracking and Verification Program to monitor the domestic production and importation of all frozen and processed tuna products nationwide and to authenticate any associated dolphin-safe claim.
Harvest Commercial fishery: U.S. harvest of Atlantic bigeye tuna is usually only a small fraction (1 percent or less) of the global Atlantic bigeye harvest.
Gear types, habitat impacts, and bycatch: U.S. commercial fishermen mainly harvest bigeye tuna using pelagic longlines.
They sometimes use rod-and-reel gear.
Fishing gear used to catch bigeye tuna rarely contacts the seafloor so habitat impacts are minimal.
Commercial fishing gear can catch protected species such as marine mammals and sea turtles.
NOAA Fisheries has taken the following additional measures to reduce bycatch, bycatch mortality, and sustainably manage the pelagic longline fishery.
Fishermen are: Required to use large circle hooks and certain types of bait that limit gear interactions with sea turtles.
Circle hooks are specifically designed to minimize the damage caused by hooking, giving animals that are captured and released a better chance at survival.
Trained to use special techniques to safely dehook and release any incidentally caught turtles.
Required to stop fishing and move 1 nautical mile if they encounter a protected species.
Required to protect pilot whales and Risso's dolphins when fishing in the Mid-Atlantic Bight by limiting the length of their lines to 20 nautical miles and posting marine mammal handling/release guidelines on their vessels.
In addition, if fishing in the Cape Hatteras Special Research Area, pelagic longliners must contact NOAA Fisheries at least 48 hours prior to a trip and carry observers if requested.
Required to use weak hooks in the Gulf of America (formerly Gulf of Mexico) to reduce incidental catch of bluefin tuna and prohibited from using live bait to reduce bycatch of billfish.
Restricted from certain areas of the Gulf of America to reduce bycatch of multiple species.
Required to carry vessel monitoring systems onboard their boats to ensure compliance with these closures.
Required to carry at-sea fisheries observers upon request.
NOAA Fisheries reviews observer data to monitor protected species interactions and takes appropriate action as necessary.
Required to install electronic monitoring (cameras) and submit camera hard drives to NOAA Fisheries to monitor bluefin tuna catch and discards.
Recreational fishery: Recreational fishermen must have a permit to fish for bigeye tuna.
Minimum size limit Recreational fishing for highly migratory species such as bigeye tuna provides significant economic benefits to coastal communities through individual angler expenditures, recreational charters, tournaments, and the shoreside businesses that support those activities.
Scientific Classification Kingdom Animalia Phylum Chordata Class Actinopterygii Order Scombriformes Family Scombridae Genus Thunnus Species obesus Last updated by NOAA Fisheries on 07/02/2026
Biology
Bigeye tuna live in the tropical and warm temperate waters of the Atlantic, Pacific, and Indian Oceans.
In the western Atlantic, they can be found from Southern Nova Scotia to Brazil.
Habitat Bigeye tuna are a highly migratory species, swimming long distances throughout the ocean.
They often swim in schools and live at or near the surface but dive into deeper waters (to about 800 feet, deeper than other tropical tunas) during the day.
Larvae are found in tropical waters, and as juvenile fish grow larger they tend to move into temperate waters.
As juveniles they often school with yellowfin and skipjack tunas at the surface, especially in warm waters.
Fishery Management NOAA Fisheries and the Atlantic Highly Migratory Species Division manage the Atlantic bigeye tuna fishery in the United States.
Managed under the 2006 Consolidated Atlantic Highly Migratory Species Fishery Management Plan : Commercial fishermen must have a permit to harvest bigeye tuna Gear restrictions Time/area closures Minimum size limit Federal management for Atlantic tunas applies to state waters as well, except in Maine, Connecticut, and Mississippi.
NOAA Fisheries periodically reviews these states’ regulations to make sure they’re consistent with federal regulations.
Highly migratory species, such as bigeye tuna, have complicated management that requires international cooperation.
The United States participates in regional fisheries management organizations, such as the International Commission for the Conservation of Atlantic Tunas (ICCAT), to enhance tuna management worldwide and promote the rigorous stewardship standards followed by our own U.S. fishermen.
NOAA Fisheries sets regulations for the U.S. western Atlantic bigeye tuna fishery based on our science as well as conservation and management measures adopted by ICCAT.
ICCAT conservation and management recommendations include: An annual total allowable catch of 61,500 metric tons in 2021 allocated among major harvesters, sharing arrangements for member countries, minimum size limits, effort controls, time/area closures, trade tracking requirements, compliance measures, and monitoring and inspection programs.
ICCAT remains concerned about unreported catches and is actively working to improve statistics by working with tuna canneries in West Africa.
Since 2011, ICCAT has also instituted numerous requirements related to catch reporting and measures to manage the use of fishy aggregating devices.
The United States has strongly advocated for management measures at ICCAT to end overfishing and rebuild the stock.
NOAA Fisheries will continue to work with ICCAT to develop effective measures to end overfishing and to implement an international rebuilding program.
In 2000, the United States established the Dolphin-Safe Tuna Tracking and Verification Program to monitor the domestic production and importation of all frozen and processed tuna products nationwide and to authenticate any associated dolphin-safe claim.
Harvest Commercial fishery: U.S. harvest of Atlantic bigeye tuna is usually only a small fraction (1 percent or less) of the global Atlantic bigeye harvest.
Gear types, habitat impacts, and bycatch: U.S. commercial fishermen mainly harvest bigeye tuna using pelagic longlines.
They sometimes use rod-and-reel gear.
Fishing gear used to catch bigeye tuna rarely contacts the seafloor so habitat impacts are minimal.
Commercial fishing gear can catch protected species such as marine mammals and sea turtles.
NOAA Fisheries has taken the following additional measures to reduce bycatch, bycatch mortality, and sustainably manage the pelagic longline fishery.
Fishermen are: Required to use large circle hooks and certain types of bait that limit gear interactions with sea turtles.
Circle hooks are specifically designed to minimize the damage caused by hooking, giving animals that are captured and released a better chance at survival.
Trained to use special techniques to safely dehook and release any incidentally caught turtles.
Required to stop fishing and move 1 nautical mile if they encounter a protected species.
Required to protect pilot whales and Risso's dolphins when fishing in the Mid-Atlantic Bight by limiting the length of their lines to 20 nautical miles and posting marine mammal handling/release guidelines on their vessels.
In addition, if fishing in the Cape Hatteras Special Research Area, pelagic longliners must contact NOAA Fisheries at least 48 hours prior to a trip and carry observers if requested.
Required to use weak hooks in the Gulf of America (formerly Gulf of Mexico) to reduce incidental catch of bluefin tuna and prohibited from using live bait to reduce bycatch of billfish.
Restricted from certain areas of the Gulf of America to reduce bycatch of multiple species.
Required to carry vessel monitoring systems onboard their boats to ensure compliance with these closures.
Required to carry at-sea fisheries observers upon request.
NOAA Fisheries reviews observer data to monitor protected species interactions and takes appropriate action as necessary.
Required to install electronic monitoring (cameras) and submit camera hard drives to NOAA Fisheries to monitor bluefin tuna catch and discards.
Recreational fishery: Recreational fishermen must have a permit to fish for bigeye tuna.
Minimum size limit Recreational fishing for highly migratory species such as bigeye tuna provides significant economic benefits to coastal communities through individual angler expenditures, recreational charters, tournaments, and the shoreside businesses that support those activities.
Scientific Classification Kingdom Animalia Phylum Chordata Class Actinopterygii Order Scombriformes Family Scombridae Genus Thunnus Species obesus Last updated by NOAA Fisheries on 07/02/2026
Where they live
Range
Bigeye tuna live in the tropical and warm temperate waters of the Atlantic, Pacific, and Indian Oceans.
In the western Atlantic, they can be found from Southern Nova Scotia to Brazil.
Habitat
NOAA Fisheries and the Atlantic Highly Migratory Species Division manage the Atlantic bigeye tuna fishery in the United States.
Managed under the 2006 Consolidated Atlantic Highly Migratory Species Fishery Management Plan : Commercial fishermen must have a permit to harvest bigeye tuna Gear restrictions Time/area closures Minimum size limit Federal management for Atlantic tunas applies to state waters as well, except in Maine, Connecticut, and Mississippi.
NOAA Fisheries periodically reviews these states’ regulations to make sure they’re consistent with federal regulations.
Highly migratory species, such as bigeye tuna, have complicated management that requires international cooperation.
The United States participates in regional fisheries management organizations, such as the International Commission for the Conservation of Atlantic Tunas (ICCAT), to enhance tuna management worldwide and promote the rigorous stewardship standards followed by our own U.S. fishermen.
NOAA Fisheries sets regulations for the U.S. western Atlantic bigeye tuna fishery based on our science as well as conservation and management measures adopted by ICCAT.
ICCAT conservation and management recommendations include: An annual total allowable catch of 61,500 metric tons in 2021 allocated among major harvesters, sharing arrangements for member countries, minimum size limits, effort controls, time/area closures, trade tracking requirements, compliance measures, and monitoring and inspection programs.
ICCAT remains concerned about unreported catches and is actively working to improve statistics by working with tuna canneries in West Africa.
Since 2011, ICCAT has also instituted numerous requirements related to catch reporting and measures to manage the use of fishy aggregating devices.
The United States has strongly advocated for management measures at ICCAT to end overfishing and rebuild the stock.
NOAA Fisheries will continue to work with ICCAT to develop effective measures to end overfishing and to implement an international rebuilding program.
In 2000, the United States established the Dolphin-Safe Tuna Tracking and Verification Program to monitor the domestic production and importation of all frozen and processed tuna products nationwide and to authenticate any associated dolphin-safe claim.
Harvest Commercial fishery: U.S. harvest of Atlantic bigeye tuna is usually only a small fraction (1 percent or less) of the global Atlantic bigeye harvest.
Gear types, habitat impacts, and bycatch: U.S. commercial fishermen mainly harvest bigeye tuna using pelagic longlines.
They sometimes use rod-and-reel gear.
Fishing gear used to catch bigeye tuna rarely contacts the seafloor so habitat impacts are minimal.
Commercial fishing gear can catch protected species such as marine mammals and sea turtles.
NOAA Fisheries has taken the following additional measures to reduce bycatch, bycatch mortality, and sustainably manage the pelagic longline fishery.
Fishermen are: Required to use large circle hooks and certain types of bait that limit gear interactions with sea turtles.
Circle hooks are specifically designed to minimize the damage caused by hooking, giving animals that are captured and released a better chance at survival.
Trained to use special techniques to safely dehook and release any incidentally caught turtles.
Required to stop fishing and move 1 nautical mile if they encounter a protected species.
Required to protect pilot whales and Risso's dolphins when fishing in the Mid-Atlantic Bight by limiting the length of their lines to 20 nautical miles and posting marine mammal handling/release guidelines on their vessels.
In addition, if fishing in the Cape Hatteras Special Research Area, pelagic longliners must contact NOAA Fisheries at least 48 hours prior to a trip and carry observers if requested.
Required to use weak hooks in the Gulf of America (formerly Gulf of Mexico) to reduce incidental catch of bluefin tuna and prohibited from using live bait to reduce bycatch of billfish.
Restricted from certain areas of the Gulf of America to reduce bycatch of multiple species.
Required to carry vessel monitoring systems onboard their boats to ensure compliance with these closures.
Required to carry at-sea fisheries observers upon request.
NOAA Fisheries reviews observer data to monitor protected species interactions and takes appropriate action as necessary.
Required to install electronic monitoring (cameras) and submit camera hard drives to NOAA Fisheries to monitor bluefin tuna catch and discards.
Recreational fishery: Recreational fishermen must have a permit to fish for bigeye tuna.
Minimum size limit Recreational fishing for highly migratory species such as bigeye tuna provides significant economic benefits to coastal communities through individual angler expenditures, recreational charters, tournaments, and the shoreside businesses that support those activities.
Scientific Classification Kingdom Animalia Phylum Chordata Class Actinopterygii Order Scombriformes Family Scombridae Genus Thunnus Species obesus Last updated by NOAA Fisheries on 07/02/2026
Ocean City & Mid-Atlantic context
From Ocean City, Maryland, use this Atlantic Bigeye Tuna profile as NOAA Mid-Atlantic directory context—not a promise you will meet the species on every charter.
Always verify current Maryland and federal size, season, and bag rules for your exact date and coordinates before you keep any catch.
Source facts and imagery are adapted from the NOAA Fisheries species profile for Atlantic Bigeye Tuna.
What charter to book from Ocean City
Atlantic Bigeye Tuna fits Ocean City offshore and trolling programs more than bay guide mornings—book the trip for the pelagic menu you actually want.
Best fit
Offshore charter — Best OC trip family when you are specifically chasing Atlantic Bigeye Tuna.
Possible / related
Trolling charter — Possible overlap depending on season, water, and boat program.
Head / party boat — Possible overlap depending on season, water, and boat program.
Not typical from OC
Bay guide — Not a typical Ocean City bay guide target for Atlantic Bigeye Tuna.
Inshore charter — Not a typical Ocean City inshore charter target for Atlantic Bigeye Tuna.
Casting / light tackle — Not a typical Ocean City casting / light tackle target for Atlantic Bigeye Tuna.
Nearshore wreck / bottom — Not a typical Ocean City nearshore wreck / bottom target for Atlantic Bigeye Tuna.
Start with the charter directory trip-type picker so you compare boats inside the right
archetype—not a bay-guide quote against a canyon invoice.
Commercial fishery: U.S. harvest of Atlantic bigeye tuna is usually only a small fraction (1 percent or less) of the global Atlantic bigeye harvest.
Gear types, habitat impacts, and bycatch: U.S. commercial fishermen mainly harvest bigeye tuna using pelagic longlines.
They sometimes use rod-and-reel gear.
Fishing gear used to catch bigeye tuna rarely contacts the seafloor so habitat impacts are minimal.
Commercial fishing gear can catch protected species such as marine mammals and sea turtles.
NOAA Fisheries has taken the following additional measures to reduce bycatch, bycatch mortality, and sustainably manage the pelagic longline fishery.
Fishermen are: Required to use large circle hooks and certain types of bait that limit gear interactions with sea turtles.
Circle hooks are specifically designed to minimize the damage caused by hooking, giving animals that are captured and released a better chance at survival.
Harvest
See the NOAA wild-caught fishery section for landings and gear notes when published for this species.
Landings and management details matter most for the waters where Atlantic Bigeye Tuna is actually fished—see the
NOAA species profile
.
Seafood facts
Fact
Detail
Sustainability
U.S. wild-caught Atlantic bigeye tuna—while only a small percent (about 1 percent) of the total Atlantic-wide harvest—is a smart seafood choice because it is sustainably managed and responsibly harvested under U.S. regulations.
Availability
Year-round.
Source
U.S. wild-caught from Massachusetts to Florida.
Taste
Bigeye tuna has a mild, meaty flavor, with a higher fat content than yellowfintuna. Sashimi lovers prefer it.
Texture
Firm and moist with large flakes.
Color
Bigeye tuna meat has a reddish-pink color.
Health
Bigeye tuna is low in saturated fat and sodium and is rich in niacin, vitamins B6 and B12, selenium, and phosphorous.
After a real OC boat day or market stop for Atlantic Bigeye Tuna, Seafood after boat days covers
dock buffer and cook-your-catch pacing.
