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C1. Tuna and Tuna-Like Species

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C1. Tuna and Tuna-Like Species 163 C1. TUNA AND TUNA-LIKE SPECIES exceptional quality reached US$500 per kg and by Jacek Majkowski * more recently even more, but such prices referring to very few single fish do not reflect the INTRODUCTION situation with the market. Bigeye are also well priced on the sashimi markets. Although The sub-order Scombroidei is usually referred to yellowfin are also very popular on these markets, as tuna and tuna-like species (Klawe, 1977; the prices they bring are much lower. For Collette and Nauen, 1983; Nakamura, 1985). It is canning, albacore fetch the best prices due to composed of tunas (sometimes referred to as true their white meat, followed by yellowfin and tunas), billfishes and other tuna-like species. skipjack for which fishermen are paid much less They include some of the largest and fastest than US$1 per kg. The relatively low prices of fishes in the sea. canning-quality fish are compensated by their The tunas (Thunnini) include the most very large catches, especially in the case of economically important species referred to as skipjack and yellowfin. Longtail tuna principal market tunas because of their global (T. tonggol) is becoming increasingly important economic importance and their intensive for canning and the subject of substantial international trade for canning and sashimi (raw international trade. The consumption of tuna and fish regarded as delicacy in Japan and tuna-like species in forms other than canned increasingly, in several other countries). In fact, products and sashimi is increasing. the anatomy of some tuna species seems to have The tunas other than the principal market species been purpose-designed for canning and loining. are more neritic (living in water masses over the Tunas are sub-classified into four genera continental shelf). They include longtail tuna, (Thunnus, Euthynnus, Katsuwonus, Auxis and blackfin tuna (T. atlanticus), black skipjack Allothunnus) with fifteen species all together. (E. lineatus), kawakawa (E. affinis), little tunny From the genus Thunnus, the principal market (E. alleteratus), bullet tuna (A. rochei) and frigate tunas are albacore (T. alalunga), bigeye tuna tuna (A. thazard). (T. obesus), Atlantic bluefin tuna (T. thynnus), The billfishes (Istiophoridae) are composed of Pacific bluefin tuna (T. orientalis) southern marlins (Makaira spp.), sailfish (Istiophorus bluefin tuna (T. maccoyii) and yellowfin tuna spp.), spearfish (Tetrapturus spp.) and swordfish (T. albacares). Skipjack tuna (Katsuwonus (Xiphias gladius, only species in the genus). With pelamis) is the seventh principal market tuna the exception of two species (Mediterranean and species. Their superbly efficient metabolic roundscale spearfish), all billfishes have very system includes a circulatory system that allows wide geographical distributions, but not all them to retain or dissipate heat as required for species occur in all oceans. Billfishes are mostly peak biological performance and efficiency. They caught by longlines as by-catch except swordfish are all oceanic (Figure C1.1), capable of long which are targeted in certain regions using also migrations or movements, constituting one or longlines and harpoons. Billfishes are also taken two stocks in each ocean. The exceptions are in sport fisheries, where they are greatly valued. Atlantic and Pacific bluefins, which do not occur They are all excellent seafood. only in their eponymous oceans. Southern bluefin Other important tuna-like species include slender constitutes a single stock extending in the tuna (Allothunnus fallai), butterfly kingfish Atlantic, Indian and Pacific Oceans. (Gasterochisma melampus), wahoo Because of the economic situation in Japan in (Acanthocybium solandri), bonitos (Cybiosarda, recent years, prices of bluefin tuna, the species Orcynopsis and Sarda), Spanish and king most valued for sashimi, although still high mackerels, seerfishand sierra (Scomberomorus compared to other species, have decreased spp.). Other important tuna-like species represent somehow. For a whole fish, fisherman may get a significant potential especially for developing between US$30 and US$40 per kg with some countries where mostly artisanal and recreational getting closer to US$100. Not long ago, a fish of fisheries are now catching them. Slender tuna and * FAO, Marine Resources Service, Fishery Resources Division 164 butterfly kingfish (with a circumpolar FISHERIES distribution in the Southern Ocean) are now caught mostly as by-catch of the Japanese Since the nineteenth century (and even from more ancient times), traditional tuna fishing has longline fishery targeting southern bluefin tuna. been carried out in various parts in the world. The 1982 UN Convention on the Law of the Sea Those fisheries were local and generally near the classifies the principal market tunas, billfishes, coasts. In the Atlantic, they included purse blackfin tuna, bullet and frigate tuna, little tunny seining for bluefin tuna off Norway, trolling for and kawakawa as highly migratory even though albacore in the Bay of Biscay, trap fishing near little tunny and kawakawa are mostly confined to the Strait of Gibraltar and North African coast, the continental shelf and upper slope. Black swordfish fishing in the northwestern Atlantic skipjack is not classified as highly migratory, but and in the Mediterranean, bigeye and skipjack it is probably more oceanic than little tunny and fishing near islands and artisanal fishing along kawakawa. the African coasts. In the Pacific, various Further information on some global aspect of artisanal fisheries operated near islands in the tunas and tuna-like species can be found in Allen tropical waters (albacore trolling off west coast of (2002) and Joseph (1998, 2000, 2003). US, baitboat fishing for yellowfin and skipjack Information references at regional scale are given off the coast of US, pole and line fishing for in the respective resources status sections. skipjack near Japan and many other fisheries for Figure C1.1 - Distribution of tuna species and their respective fisheries operation area 165 various tunas along Japanese coasts). Off South was shifted to the central and western Pacific America, coastal fisheries operated using where no dolphin fishing occurred. baitboats and small seines. In the Indian Ocean, Since the development of extremely cold storage, skipjack fishing off Sri Lanka, India, and some longliners gradually changed target from Maldives was carried out. Off Australia, longline yellowfin (for canning) to bigeye (for sashimi). fishing was carried out for southern bluefin tuna. This shift was first seen among Japanese Many other artisanal fisheries for tuna-like fishes longliners, but it gradually expanded to the fleets existed in tropical or subtropical areas all over from Korea and Taiwan Province of China. To the world. catch bigeye, whose habitat is much deeper than As the results of increasing demand for canned that of tropical tunas, long lines were set deeper tuna, industrialized fisheries started during the and deeper. This change in fishing strategy 1940s and 1950s. They included Japanese implies changes in fishing areas, leading to longline and baitboat fishing in the Pacific and modifications in target and by-catch species. US baitboat fishing off California along the In the 1980s, new purse seine fishery started in Mexican coasts, while the traditional fisheries the western Indian Ocean; many French seiners continued. After the World War II, the fishing from the eastern Atlantic moved to the Indian areas for the Japanese tuna fishery were limited Ocean. In the Pacific Ocean, the purse seine to its coast until 1952. However, since then, the fishery expanded its fishing area, particularly in fishery, particularly the longline ones, expanded the south, central and western Pacific. Purse seine the fishing area very rapidly. In late 1950s, its fishing efficiency increased with modern fishing areas reached even to the Atlantic Ocean. equipment such as bird radar and the use of Also in the late 1950s, some European pole and helicopters. During the 1990s, many new line fishing started off the African coasts from countries entered into large-scale industrial local harbours. fishing, mostly purse seining (e.g., Mexico, In the 1960s, Spanish and French boats with pole Venezuela and Brazil). Small-scale longline and line and purse seines started tuna fishing off fishing operations by coastal countries in various west Africa. Also, Japanese longliners expanded areas (e.g., Mediterranean countries, Philippines their fishing area all over the world, mostly and Indonesia) also started. The Japanese fishing albacore and yellowfin for canning. In the longline fleet started to reduce its size in the middle of the 1960s, Korea and Taiwan Province 1980s. At the same time, Taiwan Province of of China started large-scale longline fishing to China longliners and others flying flags of export tuna for canning, learning the techniques convenience increased rapidly. from Japan. At the end of this decade, the Particularly in the 1980s, management regulatory Japanese longline industry developed an measures for tuna fisheries were introduced by extremely cold storage system used for new tuna fishery bodies, which also affected fishing frozen products for the sashimi market. patterns and country shares of catches. In the Consequently, Japan switched the target species 1990s, more management measures were from yellowfin and albacore to bluefin and introduced, this resulted in an increase in illegal, bigeye. US pole and line fishing
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