Yellowfin tuna

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Yellowfin tuna
Thunnus albacares.png
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Scombriformes
Family: Scombridae
Genus: Thunnus
Subgenus: Neothunnus
Species:
T. albacares
Binomial name
Thunnus albacares
Bonnaterre, 1788
Synonyms [2]
  • Scomber albacaresBonnaterre, 1788
  • Germo albacares(Bonnaterre, 1788)
  • Neothunnus albacares(Bonnaterre, 1788)
  • Scomber albacorus Lacepède, 1800
  • Thynnus argentivittatus Cuvier, 1832
  • Germo argentivittatus(Cuvier, 1832)
  • Neothunnus argentivittatus(Cuvier, 1832)
  • Thunnus argentivittatus(Cuvier, 1832)
  • Scomber sloaneiCuvier, 1832
  • Thynnus albacora Lowe, 1839
  • Germo albacora(Lowe, 1839)
  • Neothunnus albacora(Lowe, 1839)
  • Orcynus albacora(Lowe, 1839)
  • Thunnus albacora(Lowe, 1839)
  • Thynnus macropterus Temminck & Schlegel, 1844
  • Germo macropterus(Temminck & Schlegel, 1844)
  • Neothunnus macropterus(Temminck & Schlegel, 1844)
  • Orcynus macropterus(Temminck & Schlegel, 1844)
  • Thunnus macropterus(Temminck & Schlegel, 1844)
  • Orcynus subulatus Poey, 1875
  • Thunnus allisoniMowbray, 1920
  • Germo allisoni(Mowbray, 1920)
  • Neothunnus allisoni(Mowbray, 1920)
  • Neothunnus itosibi Jordan & Evermann, 1926
  • Germo itosibi(Jordan & Evermann, 1926)
  • Semathunnus itosibi(Jordan & Evermann, 1926)
  • Thunnus itosibi(Jordan & Evermann, 1926)
  • Neothunnus catalinaeJordan & Evermann, 1926
  • Thunnus catalinae(Jordan & Evermann, 1926)
  • Kishinoella zacallesJordan & Evermann, 1926
  • Thunnus zacalles(Jordan & Evermann, 1926)
  • Semathunnus guildi Fowler, 1933
  • Neothunnus brevipinnaBellón & Bàrdan de Bellón, 1949

The yellowfin tuna (Thunnus albacares) is a species of tuna found in pelagic waters of tropical and subtropical oceans worldwide.

Contents

Yellowfin is often marketed as ahi, from the Hawaiian ʻahi, a name also used there for the closely related bigeye tuna. [3] The species name, albacares ("white meat") can also lead to confusion: in English, the albacore (Thunnus alalunga) is a different species, while yellowfin is officially designated albacore in French and referred to as albacora by Portuguese fishermen.

Description

The yellowfin tuna is among the larger tuna species, reaching weights over 180 kg (400 lb), but is significantly smaller than the Atlantic and Pacific bluefin tunas, which can reach over 450 kg (990 lb), and slightly smaller than the bigeye tuna and the southern bluefin tuna.

The second dorsal fin and the anal fin, as well as the finlets between those fins and the tail, are bright yellow, giving this fish its common name. The second dorsal and anal fins can be very long in mature specimens, reaching almost as far back as the tail and giving the appearance of sickles or scimitars. The pectoral fins are also longer than the related bluefin tuna, but not as long as those of the albacore. The main body is a very dark metallic blue, changing to silver on the belly, which has about 20 vertical lines.

Reported sizes in the literature have ranged as high as 2.4 m (7 ft 10 in) in length and 200 kg (440 lb) in weight. The all-tackle International Game Fish Association (IGFA) record for this species stands at 193.68 kg (427.0 lb) for a yellowfin caught in 2012 off Cabo San Lucas, Mexico. The fisherman received a prize of $1 million once the catch was confirmed by the IGFA. [4] [5]

Habitat

Yellowfin tuna are epipelagic fish that inhabit the mixed surface layer of the ocean above the thermocline. Sonic tracking has found that although yellowfin tuna, unlike the related bigeye tuna, mostly range in the top 100 m (330 ft) of the water column, [6] another study reported that depth tends to vary with time of day: 90% of their recorded depth values were shallower than 88 m (289 ft) during the night, and shallower than 190 m (620 ft) during the day. [7]

Although yellowfin tuna penetrate the thermocline relatively infrequently, they are capable of diving to considerable depths. An individual tagged in the Indian Ocean with an archival tag spent 85% of its time in depths shallower than 75 m (246 ft), but was recorded as having made three dives to 578, 982, and 1,160 m (3,810 ft). [6] The maximum dive depth measured in a second study was 1,592 m (5,223 ft). [8] [7]

Yellowfin tuna jumping Yellowfin tuna diving.jpg
Yellowfin tuna jumping
Schooling yellowfin tuna Yellowfin tuna nurp.jpg
Schooling yellowfin tuna

Behavior

Although mainly found in deep offshore waters, yellowfin tuna may approach shore when suitable conditions exist. Mid-ocean islands such as the Hawaiian archipelago, other island groups in the Western Pacific, Caribbean, and Maldives islands in the Indian Ocean, as well as the volcanic islands of the Atlantic such as Ascension Island and Saint Helena, often harbor yellowfin feeding on the baitfish these spots concentrate close to the shoreline. Yellowfin may venture well inshore of the continental shelf when water temperature and clarity are suitable and food is abundant.

Yellowfin tuna often travel in schools with similarly sized companions. They sometimes school with other tuna species and mixed schools of small yellowfin, and skipjack tuna, in particular, are commonplace. They are often associated with various species of dolphins or porpoises, as well as with larger marine creatures such as whales and whale sharks. They also associate with drifting flotsam such as logs and pallets, and sonic tagging indicates some follow moving vessels. Hawaiian yellowfins associate with anchored fish aggregation devices and with certain sections of the 50-fathom curve.

Diet and predation

Yellowfin tuna at an aquarium in Japan

Yellowfin tuna prey include other fish, pelagic crustaceans, and squid. Like all tunas, their body shape is particularly adapted for speed, enabling them to pursue and capture fast-moving baitfish such as flying fish, sauries, and mackerel. Schooling species such as myctophids or lanternfish and similar pelagic driftfish, anchovies, and sardines are frequently taken. Large yellowfins prey on smaller members of the tuna family such as frigate mackerel and skipjack tuna.

In turn, yellowfin are preyed upon when young by other pelagic hunters, including larger tuna, seabirds, and predatory fishes such as wahoo, shark, and billfish. Adults are threatened only by the largest and fastest hunters, such as toothed whales, particularly the false killer whale, pelagic sharks such as the mako and great white, large Atlantic blue marlin and Pacific blue marlin, and black marlin. The main source of mortality, however, is industrial tuna fisheries.

Yellowfins are able to escape most predators because of their speed, swimming at up to 20.8 m/s (47 mph). [9] Unlike most fish, tuna are warm-blooded. [10] Their unique cardiovascular system, warm body temperature, elevated metabolism, and well-developed lymphatic system are all involved in their ability to engage in both rapid bursts and long periods of swimming. When swimming rapidly, a tuna's fins retract into grooves to form a smooth aerodynamic surface and increase its speed, due to a biological hydraulic system involving the lymphatic system. [11] [12]

The behavior of abruptly diving to deeper levels may be a tactic to escape predators. Evidence from trackers even includes a case in which a diving yellowfin tuna may have been swallowed at a depth of 326 m (1,070 ft). [8] [7]

Commercial fishery

Yellowfin tuna loaded onto a truck for transportation in Palabuhanratu, West Java Thunn albac 100708-5564 plrtu.JPG
Yellowfin tuna loaded onto a truck for transportation in Palabuhanratu, West Java

Modern commercial fisheries catch yellowfin tuna with encircling nets (purse seines), and by industrial longlines. In 2010, 558,761 metric tons of yellowfin tuna were caught in the western and central Pacific Ocean. [10]

Pole and line

Formerly, much of the commercial catch was made by pole-and-line fishing, using live bait such as anchovy to attract schools of tuna close to the fishing vessel that were then taken with baited jigs on sturdy bamboo or fiberglass poles or on handlines. This fishery, which targeted skipjack and occasionally albacore, as well as yellowfin, for canning, reached its heyday between World War I and the 1950s before declining. The most well-known fleet of pole-and-line boats sailed from San Diego [13] in California and exploited abundant stocks in Mexican waters, as well as further south to Panama, Costa Rica, and the Galapagos Islands. [14]

Pole-and-line fishing is still carried out today in the Maldives, Ghana, the Canary Islands, Madeira, and the Azores. Few pole-and-line boats now specifically target yellowfin, an incidental take compared to the total commercial catch. In the Maldives, the catch is a mix of skipjack tuna and small yellowfins that often associate with them.

Purse seining

A yellowfin being weighed at the General Santos Fish Port Complex in General Santos, the center of the tuna industry in the Philippines which is the world's 4th largest producer of canned and fresh-chilled tuna products Gen Santos city 5.jpg
A yellowfin being weighed at the General Santos Fish Port Complex in General Santos, the center of the tuna industry in the Philippines which is the world's 4th largest producer of canned and fresh-chilled tuna products

Purse seining largely took over commercial tuna fisheries in the 1960s and 1970s. Today, purse seines account for more of the commercial catch than any other method. The purse-seine fishery primarily operates in the Pacific Ocean, in the historic tuna grounds of the San Diego tuna fleet in the eastern Pacific, and in the islands of the western Pacific, where many U.S. tuna canneries relocated in the 1980s, but significant purse-seine catches are also made in the Indian Ocean and in the tropical Atlantic Ocean, especially in the Gulf of Guinea by French and Spanish vessels.

Purse-seine vessels locate tuna using onboard lookouts, as was done in the pole-and-line fishery, but they also employ sophisticated onboard electronics, sea-surface temperature and other satellite data, and helicopters overhead. Once a school is located, the net is set around it. A single set may yield 100 t (98 long tons; 110 short tons). Modern tuna seiners have a capacity up to 2,000 metric tons (2,000 long tons; 2,200 short tons), reach speeds of over 17 knots (31 km/h; 20 mph), and carry multiple spotting helicopters. [17]

Purse seining for yellowfin tuna became highly controversial in the late 1970s when it became apparent that the eastern Pacific fishery was killing many spinner dolphins, pantropical spotted dolphins, and other cetaceans (often called "porpoises" by the tuna fleet) that accompany the fish. This association has been long-recognized by commercial tuna fishermen.

Dolphin-friendly labeling

Since the introduction of "dolphin-friendly" labeling, an increasing number of purse seine sets are now made on "free schools" unassociated with dolphins, as well as schools that associate with floating objects—another long-understood association that has grown in importance in tuna fisheries. The latter practice in particular has a major ecological impact because of the high proportion of bycatch, including manta rays, sea turtles, pelagic sharks, billfish, and other threatened marine species taken by setting nets around logs and other floating objects. Such tuna are often significantly smaller than the larger adult tuna associated with dolphins. The removal of huge numbers of juvenile yellowfin and bigeye tuna that have yet to reach breeding age has major potential consequences for tuna stocks worldwide.

Longline

Most of the commercial catch is canned, but the sashimi marketplace adds significant demand for high-quality fish. This market is primarily supplied by industrial tuna longline vessels.

Industrial longlining was primarily perfected by Japanese fishermen who expanded into new grounds in the Western Pacific, Indian, and Atlantic Oceans in the late 1950s and early 1960s. Longlining has since been adopted by other fishermen, most notably South Korea, Taiwan, and the United States.

Tuna longlining targets larger sashimi-grade fish around 25 kg (55 lb) and up that swim deeper in the water column. In tropical and warm temperate areas, the more valuable bigeyes are often the main target, but significant effort is also directed towards larger yellowfins. Longlining seeks areas of higher ocean productivity indicated by temperature and chlorophyll fronts formed by upwellings, ocean current eddies, and major bathymetric features. Satellite imaging technology is the primary tool for locating these dynamic and constantly changing ocean areas.

Bycatch is a major environmental issue in the longline fishery, especially impacting billfish, sea turtles, pelagic sharks, and seabirds.

Artisanal fisheries

Besides the large-scale industrial purse seine and longline fisheries, yellowfin tuna also support smaller-scale artisanal fisheries that have often supplied local domestic markets for generations. Artisanal fisheries now also often fish for the lucrative sashimi market in many locations where international air shipment is possible.[ citation needed ]

Artisanal fishermen tend to employ assorted hook-and-line gear such as trolling lines, surface and deep handlines, and longlines.

By far, the largest fishery using artisanal methods exists in Philippine and Indonesian waters where thousands of fishermen target yellowfin tuna around fish aggregation devices or payaos, although this fishery far exceeds the artisanal scale in terms of tonnage caught and the numbers of participants involved, and should more properly be considered a commercial handline fishery. General Santos is the most important Philippine port for the landing and transhipment of catches. Catches that qualify as sashimi-grade are mostly shipped to the Japanese market; those that do not meet the grade are sold locally or canned. Elsewhere in the Pacific, small-boat fishers in Hawaii, Tahiti, and other Pacific islands supply local and in some cases foreign markets with fresh yellowfins.[ citation needed ]

Handline-caught yellowfin tuna is one of the few exports of the economy of St. Helena.

Sport fishing

Yellowfin tuna probably first came to the attention of sport fishermen when they appeared on the tuna grounds of Catalina Island, California, only a few years after pioneering fishermen invented the sport, targeting the Pacific bluefin tuna. These tuna were of the same species caught by commercial fishermen in Japan and the western Pacific, but the reason for their appearance was not known at the time. Later, warmer water species such as yellowfin tuna, dorado and striped marlin were found to enter southern California waters in seasons having favorable ocean conditions, particularly during the El Niño phenomenon, which brings warmer water up North America's western coast.

Yellowfin tuna were subsequently discovered by sport fishermen in Bermuda, the Bahamas, Hawai'i, and many other parts of their range. Larger adult fish which had developed distinctively long sickle fins were initially thought to be a different species and were known as Allison tuna (a name first given by the then curator of the Bermuda Aquarium, Louis Mowbray, in 1920). Such destinations as Hawai'i and Bermuda became famed for their catches of these beautiful fish. In Hawai'i, various styles of feather lures served as bait, but in Bermuda, chumming techniques from boats anchored on productive banks were evolved to target not only Allison tuna, but also wahoo and the smaller blackfin tuna. Bermudian experts developed techniques to take all these fish on light tackle, and for many years the International Game Fish Association records for yellowfin tuna were dominated by entries from Bermuda in the lighter line classes, with fish in the 200 lb (91 kg) and larger class from Hawai'i taking most of the heavier line-class records.

Today, yellowfin tuna are a major sport fish pursued by sport fishermen in many parts of the world. Thousands of anglers fish for yellowfin tuna along the eastern seaboard of the United States, particularly in North Carolina and New England. Yellowfin are also a popular gamefish among anglers fishing from US Gulf Coast ports, San Diego, and other ports of southern California. Larger "long-range" boats in the San Diego fleet also fish in Mexican waters, searching for yellowfin tuna in many of the grounds that the San Diego pole-and-line tuna clippers used to fish. The yellowfin tuna is also a highly prized catch in the offshore sport fisheries of South Africa, Australia, and New Zealand. Sport fishing for yellowfin tuna exists on a smaller scale in many other parts of the world.

Gulf of Mexico

Recreational fishing for Yellowfin Tuna in the Gulf of Mexico is a significant contributor to the region's economy, with an estimated economic impact of $7 billion annually. [18] This type of fishing has led to the development of a thriving tourism industry, with many fishing charters and resorts offering guided trips and equipment rental services to visitors.

Yellowfin Tuna are highly sought after for their impressive size and excellent taste, making them a popular target for recreational anglers. The thrill of reeling in a massive Yellowfin Tuna has attracted many fishing enthusiasts to the Gulf of Mexico, creating a significant source of revenue for local businesses and communities. To ensure the sustainability of Yellowfin Tuna populations in the Gulf of Mexico, many fishing organizations have implemented catch limits and other measures to protect these fish for future generations of recreational fishermen to enjoy.

Clubs

During the early 1900's many yellowfin tuna fishing clubs were formed around the world. In 1917, the Yokohama Fishing Club was founded, becoming the first fishing club in Japan to cater to foreigners. The Tuna Club of Avalon, which was founded in 1898 in Avalon, California played an instrumental role in the development of the sport in North America. While in Europe The Club Nautico de San Remo in Italy and the Club Nautique de Cannes in France are two of the earliest known clubs to organize yellowfin tuna fishing tournaments in these countries, with the first tournaments held in the late 1960s.

Cuisine

According to the Hawaii Seafood Buyers Guide, yellowfin tuna is widely used in raw fish dishes, especially sashimi . This fish is also excellent for grilling. [3] Yellowfin is often served seared rare.

Yellowfin buyers recognize two grades, "sashimi grade" and "other", although variation in the quality of "other" grades occurs.

Different seafood sustainability guides come to different conclusions about whether yellowfin fishing is sustainable. The Audubon's Seafood Guide (a guide for what types of marine food products are not ecofriendly) lists troll-caught tuna as "OK", but labels long-line caught as "Be Careful". [19]

Yellowfin is becoming a popular replacement for the severely depleted supplies of southern bluefin tuna.

In 2010, Greenpeace International added the yellowfin tuna to its seafood red list. The Greenpeace International seafood red list is a "list of fish that are commonly sold in supermarkets around the world, and which have a very high risk of being sourced from unsustainable fisheries". [20]

Related Research Articles

<span class="mw-page-title-main">Tuna</span> Tribe of fishes

A tuna is a saltwater fish that belongs to the tribe Thunnini, a subgrouping of the Scombridae (mackerel) family. The Thunnini comprise 15 species across five genera, the sizes of which vary greatly, ranging from the bullet tuna up to the Atlantic bluefin tuna, which averages 2 m (6.6 ft) and is believed to live up to 50 years.

<span class="mw-page-title-main">Albacore</span> Species of tuna

The albacore, known also as the longfin tuna, is a species of tuna of the order Scombriformes. It is found in temperate and tropical waters across the globe in the epipelagic and mesopelagic zones. There are six distinct stocks known globally in the Atlantic, Pacific, and Indian oceans, as well as the Mediterranean Sea. The albacore has an elongate, fusiform body with a conical snout, large eyes, and remarkably long pectoral fins. Its body is a deep blue dorsally and shades of silvery white ventrally. Individuals can reach up to 1.4 m in length.

<span class="mw-page-title-main">Atlantic bluefin tuna</span> Species of fish

The Atlantic bluefin tuna is a species of tuna in the family Scombridae. It is variously known as the northern bluefin tuna, giant bluefin tuna [for individuals exceeding 150 kg (330 lb)], and formerly as the tunny.

<span class="mw-page-title-main">Skipjack tuna</span> Species of fish

The skipjack tuna is a medium-sized perciform fish in the tuna family, Scombridae, and is the only member of the genus Katsuwonus. It is otherwise known as katsuo, arctic bonito, mushmouth, oceanic bonito, striped tuna or victor fish. It grows up to 1 m (3 ft) in length. It is a cosmopolitan pelagic fish found in tropical and warm-temperate waters. It is a very important species for fisheries.

<span class="mw-page-title-main">Pelagic fish</span> Fish in the pelagic zone of ocean waters

Pelagic fish live in the pelagic zone of ocean or lake waters—being neither close to the bottom nor near the shore—in contrast with demersal fish that live on or near the bottom, and reef fish that are associated with coral reefs.

<span class="mw-page-title-main">Fish aggregating device</span> Man-made object used to attract ocean-going pelagic fish

A fish aggregatingdevice (FAD) is a man-made object used to attract pelagic fish such as marlin, tuna and mahi-mahi. They usually consist of buoys or floats tethered to the ocean floor. FADs attract fish for reasons that vary by species.

<span class="mw-page-title-main">Bigeye tuna</span> Species of fish

The bigeye tuna is a species of true tuna of the genus Thunnus, belonging to the wider mackerel family Scombridae. In Hawaiian, it is one of two species known as ʻahi, the other being the yellowfin tuna. Bigeye tuna are found in the open waters of all tropical and temperate oceans, but not in the Mediterranean Sea.

<span class="mw-page-title-main">Southern bluefin tuna</span> Species of fish

The southern bluefin tuna is a tuna of the family Scombridae found in open southern Hemisphere waters of all the world's oceans mainly between 30°S and 50°S, to nearly 60°S. At up to 2.5 metres and weighing up to 260 kilograms (570 lb), it is among the larger bony fishes.

A payaos is a type of fish aggregating device used in Southeast Asia, particularly in the Philippines. Payaos were traditionally bamboo rafts for handline fishing before World War II, but modern steel payaos use fish lights and fish location sonar to increase yields. While payaos fishing is sustainable on a small scale, the large scale, modern applications have been linked to adverse impacts on fish stocks.

<span class="mw-page-title-main">Blackfin tuna</span> Species of fish

The blackfin tuna is a species of tuna in the family Scombridae. It is occasionally referred to as the Bermuda tuna, blackfinned albacore, or deep bodied tunny. They are the smallest tuna species in the genus Thunnus, generally growing to a maximum of 100 cm (39 in) in length and weighing 21 kg (46 lb).

<i>Thunnus</i> Genus of fishes

Thunnus is a genus of ocean-dwelling, ray-finned bony fish from the mackerel family, Scombridae. More specifically, Thunnus is one of five genera which make up the tribe Thunnini – a tribe that is collectively known as the tunas. Also called the true tunas or real tunas, Thunnus consists of eight species of tuna, divided into two subgenera.

<span class="mw-page-title-main">Pacific bluefin tuna</span> Species of fish

The Pacific bluefin tuna is a predatory species of tuna found widely in the northern Pacific Ocean, but it is migratory and also recorded as a visitor to the south Pacific.

<span class="mw-page-title-main">Little tunny</span> Species of fish

The little tunny, also known as the false albacore, little tuna, bonita, or erroneously as the blue bonito, is a species of tuna in the family Scombridae. It can be found in the Atlantic Ocean and the Mediterranean and Black seas; in the western Atlantic, it ranges from Brazil to the New England states. The little tunny is a pelagic fish that can be found regularly in both offshore and inshore waters, and it is classified as a highly migratory species. The little tunny is best identified by the "worm-like" markings on its back and the dark spots appearing between its pectoral and ventral fins.

<span class="mw-page-title-main">Fishing industry in the Maldives</span>

The fishing industry in the Maldives is the island's second main industry. According to national tradition in the words of former President Maumoon Abdul Gayoom, "Fishing is the lifeblood of our nation, it is inborn. From the soil on which we live, to the sea around us, it remains an integral part of our existence. Fishing, and our country and its people, [are] one and shall remain inseparable forever." The Maldives has an abundance of aquatic life and species of fish. Common are tuna, groupers, dolphin fish, barracuda, rainbow runner, trevally and squirrelfish and many more. Aside from being of essential importance to the economy, fishing is also a popular recreational activity in the Maldives, not only among locals but by tourists. The islands have numerous fishing resorts which cater for these activities.

<span class="mw-page-title-main">Cross Seamount</span> Seamount far southwest of the Hawaii archipelago

Cross Seamount is a seamount far southwest of the Hawaii archipelago, about equidistant from the cities of Honolulu and Kona. It is one of the numerous seamounts surrounding Hawaii, although unrelated to the Hawaiian hotspot. It is notable for being one of the best studied of the numerous seamounts surrounding Hawaii, as it has been included in numerous biological surveys, most recently in 2007. It is also a site of offshore fishing, for its abundant tuna. The fishery management problems at Cross Seamount are typical of management problems in many fisheries, and its small size makes it a scientifically useful model for the analysis of fishery management.

<span class="mw-page-title-main">International Seafood Sustainability Foundation</span>

International Seafood Sustainability Foundation (ISSF) was formed in 2009 as a global, non-profit partnership among the tuna industry, scientists and World Wide Fund for Nature. The multistakeholder group states its mission is "to undertake science-based initiatives for the long-term conservation and sustainable use of tuna stocks, reducing bycatch and promoting ecosystem health". Regional Fisheries Management Organizations (RFMOs) are primarily responsible for managing the world's tuna stocks—skipjack, yellowfin and albacore tuna, the species most commonly processed for canned and shelf-stable tuna products, but their parliamentary procedures too often allow the short-term economic and political interests of nations to prevent sustainable measures from being adopted. ISSF works to ensure that effective international management practices are in place to maintain the health of all the tuna stocks.

The Republic of the Marshall Islands has a commercial fishery that targets bigeye and yellowfin tuna using pelagic longline fishing gear. There were 55 longline vessels licensed to fish in the Republic of the Marshall Islands Exclusive Economic Zone (EEZ) in 2011, of which 4 were Marshall Islands-flagged and 51 were foreign-licensed vessels, including 22 Chinese-flagged, 16 Japanese-flagged, 11 Federated States of Micronesia-flagged, and 2 Taiwan-flagged. The Japanese-flagged longliners land their catch in Japan; the other 39 vessels were domestically-based. In 2011, the Marshall Islands longline fleet had reported landings of principal market species of 259 mt of bigeye tuna, 99 mt of yellowfin tuna, 37 mt of blue marlin, 7 mt of black marlin, 4 mt of albacore tuna, and 3 mt of broadbill swordfish. Fresh chilled bigeye and yellowfin tuna is exported primarily to markets in the U.S., China and Canada, and frozen tuna and incidental market species are exported to China and marketed locally.

<i>Billfish in the Indian Ocean</i> Species of billfish found in the Indian ocean

Of the twelve species of billfish, there are six species of Billfish in the Indian Ocean.

<i>Brama dussumieri</i> Species of fish

Brama dussumieri, the lesser bream or lowfin pomfret, is a species of marine ray-finned fish, a pomfret of the family Bramidae. It is found in warm seas around the world.

US FWS <i>Hugh M. Smith</i> U.S. fisheries research vessel

US FWS Hugh M. Smith was an American fisheries science research vessel in commission from 1949 to 1959 in the fleet of the United States Department of the Interior's Fish and Wildlife Service. She was among the first U.S. fisheries science vessels to explore the central Pacific Ocean in search of commercially valuable populations of fish.

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Further reading