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2.1.10.1 BON CHAPTER 2.1.10.1 AUTHORS: LAST UPDATE: ATLANTIC BONITO J. VALEIRAS and E. ABAD Sept. 4, 2006 2.1.10.1 Description of Atlantic Bonito (BON) 1. Names 1.a Classification and taxonomy Species name: Sarda sarda (Bloch 1793) ICCAT species code: BON ICCAT names: Atlantic bonito (English), Bonite à dos rayé (French), Bonito (Spanish) According to Collette and Nauen (1983), the Atlantic bonito is classified as follows: • Phylum: Chordata • Subphylum: Vertebrata • Superclass: Gnathostomata • Class: Osteichthyes • Subclass: Actinopterygii • Order: Perciformes • Suborder: Scombroidei • Family: Scombridae 1.b Common names List of vernacular names used according to ICCAT, FAO and Fishbase (www.fishbase.org). The list is not exhaustive and some local names might not be included. Albania: Palamiti. Algeria: Bonite, Bonite à dos rayé, Palamita, Rsela. Angola: Bonito, Sarda, Sarrajão, Serrajão, Serralhão. Argentina: Bonito. Azores Islands: Atlantic bonito, Bonito, Serra. Benin: Kpokoukpokou. Brazil: Bonito, Bonito-atlântico, Cavala, Sarda, Sarrajão, Serra, Serra-comum, Serra-de-escama, Serra-sarda. Bulgaria: Lakerda, Palamud, Turuk. Cape Verde: Bonito, Bonito do Atlântico, Bonito-de-lombo-listado, Sarrajão. China: ≴㫎. Colombia: Bonito. Croatia: Palamida, Polanda. Cuba: Bonito. Denmark: Pelamide, Rygstribet pelamide. Finland: Sarda. Former USSR: Atlanticheskaya pelamida, Lacherda, Pelamida. France: Bonite à dos rayé, Bonicou, Boniton, Boussicon, Boussicou, Conite, Pélamide, Pelamide commun, Pelamido. Germany: Bonito, Pelamide, Unechter Bonito. Greece: ȇȓțȚ, ȉȠȣȜȓʌȚ, ȉȠȡȞȑIJIJĮ, ȆĮȜĮȝȓįĮ, ȃIJȠȡȓțȚ, Doriki, Koini, Palamida, Palamída, Ternata, Toriki, Touliki. Guinea: Koko. Iceland: Rákungur. Israel: Sarda. 199 ICCAT MANUAL, 1st Edition (January 2010) Italy: Bonnicou, Cavaritu imperiali, Paamia, Paamie, Palameit, Palametiedde, Palametto, Palamia, Palamida, Palamide, Palamidu, Palamita, Palamito, Palamitu, Palamitu maiaticus, Palammete, Palammete cuvarita, Paramira, Parantuni, Pelamida, Pilamitu, Pirantuni, Pisantuni, Sangulu, Scurma, Sgamiru, Sgonfietto, Strombo, Tombarello, Tunnacchiu, Tunnareiu. Japan: Hagatsuo, Kigsungegatsuo. Lebanon: Ghazâl. Libya: ττΨϣ, Balamit, Blamto, Mghatat. Madeira Island: Cerda, Serrajão, Serralhão. Malta: Malta: Palamia, Palamit, Palamita, Plamitu, Plamtu. Marshall Islands: Loj, Looj. Martinique: Bonite. Mauritania: Bonite, Bonite à dos rayé, Bonito, Doulou doulou, Pélamide. Mexico: Bonito del Atlántico. Monaco: Palamida, Paramida, Piramida. Morocco: Bonito, Cerda. Namibia: Atlantiese bonito, Bonito, Pelamide. Netherlands: Atlantische boniter, Bonito. Norway: Pelamide, Stripet pelamide. Poland: Pelamida. Portugal: Bonito, Bonito-do-Atlântico, Sarrajâo, Serra. Romania: Lacherda, Palamida, Pelamida. Russian Fed: ɩɟɥɚɦɢɞɚ ɚɬɥɚɧɬɢɱɟɫɤɚɹ. Senegal: Bonite à dos rayé, Dullu dullu, Kiri kiri, wal. Sierra Leone: Bonito. Slovenia: Palamida. South Africa: Atlantic bonito, Atlantiese bonito, Katonkel. Spain: Bonito, Bonito atlántico, Bonito del Atlántico, Bonitol, Bonítol, Bonitu, Cerda, Sierra. Sweden: Pelamida, Pelamide, Ryggstrimmig pelamid. Syria: Palamet. Trinidad Tobago: Bonito. Tunisia: Balamit, Palamid, Rsela, Toumbrel. Turkey: Altiparmak, Çingenepalamudu, Kestanapalamudu, Palamut, Palamut torik, Palamutvonozu, Piçuta, Sivri, Torik, Zindandelen. United Kingdom: Atlantic bonito, Belted bonito, Bonito, Pelamid, Short finned tunny, Stripe-backed pelamis. Ukraine: Pelamida. Uruguay: Bonito. United States of America: Atlantic bonito, Bloater, Bone jack, Bonito, Boston mackerel, Common bonito, Skipjack. Venezuela: Cabaña blanca, Cabaña cariba, Cabaña de dientes. 200 2.1.10.1 BON 2. Identification Figure 1. Drawing of an adult Sarda sarda (by A. López ‘Tokio’). Characteristics of Sarda sarda (see Figure 1 and Figure 2) Atlantic bonito is a small tuna species. Maximum length in the Atlantic is 91.4 cm fork length and 5.4 kg and in the Black Sea is 85 cm and 5 kg weight (Collete and Nauen 1983). Common size is 50 cm fork length and about 2 kg. Maximum published weight is 11.0 kg (IGFA 2001). Colour: • Back and upper sides steel blue, silvery below. • 5-11 longitudinal oblique dorsal dark stripes running forward and downward (with a greater angle than in other species of Sarda). • Dorsal and caudal dusky. Pectoral pale. Other fins more or less silvery. External: • Body elongate and slightly compressed. • Body completely covered with very small scales except on the well-developed corselet. • Caudal peduncle slender, with a well developed lateral keel between two smaller keels on each side. • First dorsal fin long, nearly reaches second dorsal. • Dorsal spines: 20-23. • Anal rays: 14-17. • Gillrakers on first arch: 16-22. • The mouth is moderately large. 16-26 conical teeth in upper jaw, 12 to 24 in lower. No teeth on tongue. • Lamellae of olfactory rosette 22-33. • Interpelvic process small and bifid. Internal: • Swimbladder absent. • Spleen large and prominent in ventral view. • Liver with elongate left and right lobe and short middle lobe. • No cutaneus artery. • Vertebrae: 50-55. 201 ICCAT MANUAL, 1st Edition (January 2010) First dorsal fin long, nearly reaches second dorsal 5-11 longitudinal oblique dorsal dark stripes running forward and downward Caudal peduncle slender, with a well developed lateral keel between two smaller keels on each side Figure 2. Synthesis of the most outstanding characteristics of Sarda sarda (by A. López, ‘Tokio’). 3. Distribution and population ecology 3.a Geographical distribution Distributed in both sides of the tropical and subtropical Atlantic Ocean, in the Gulf of Mexico, and in the Mediterranean and Black Seas (Figure 3). In the Eastern Atlantic distributes from Oslo (Norway) to Port Elizabeth (South Africa). Including the Mediterranean and Black Sea. In the western Atlantic off the east coast of the United States and Canada its usual northern limit is Cape Ann but also has been recorded along Nova Scotia. Off the Atlantic coast of South America the species is recorded from Colombia, Venezuela, and south of the Amazon River to northern Argentina; apparently absent from most of the Caribbean Sea. Figure 3. Geographical distribution of Atlantic bonito (FAO. c2001-2009. Compilation of aquatic species distribution maps of interest to fisheries. In FAO Fisheries Department [online]. Rome. [15 sept. 2009]. http://www.fao.org/fishery/collection/fish_dist_map). 202 2.1.10.1 BON 3.b Habitat preferences Atlantic bonito is an epipelagic marine fish distributed at temperate and subtropical waters, from latitude between 65°N and 40°S, longitude 98°W to 42°E. It is an oceanodromous species which lives in schools along the neritic area and may enter in estuaries. It can be found from 80 to 200 meters depth. Temperature is one of the most important environmental factors determining the distribution of tuna fish. This species can adapt to different temperatures 12° to 27°C and salinities 14 to 39 (Bianchi et al. 1999). 3.c Migrations Little is known about bonito migration patterns. The species migrates along the coast large distances as prove by recaptures of tagged fish in the Black Sea and Alboran Sea (WesWHUQ0HGLWHUUDQHDQ6HD 5H\et al. 1984). A genetic migration from Atlantic to Alboran and from Aegean to Black Sea was proved by tagging in spring. $IWHUVSDZQLQJVHDVRQERQLWRPLJUDWHVLQRSSRVLWHURXWH,QZHVWHUQ0HGLWHUUDQHDQ6HDRIUHFDSWXUHGfish ZHUHIRXQGLQ$WODQWLF2FHDQ6RPHVWXGLHVVXJJHVWWKDWWKH$WODQWLFERQLWRLVUHVLGHQWLQZHVWHUQ0HGLWHUUDQHDQ sea all over the year and the mature fish migrate from coastal areas to open sea to spawn (Sabatés and Recasens ,QHDVWHUQ0HGLWHUUDQHDQ6HDWKHVSHFLHVPLJUDWHWRZDUGVWKH%ODFN6HDDWWLPHRIVSDZQLQJ 0D\WR July) and from the end of July a reverse migration takes place, although there are a number of exceptions to these migratory movements (Nümann 1954). 3.d Recruitment Knowledge of the early life stages in tunas is very scarce. It is assumed that larval period is short. The beginning of the juvenile period has been established arbitrarily as to sizes escaping from plankton nets, around 2 cm %DUG 'XULQJWKHILUVWOLIHstages bonitos are not caught and juvenile life history is unknown. Immature fish first appear in fishery from around 15 cm of fork length (Zengin, 2005). 4. Biology 4.a Growth Atlantic bonito age determination and growth have been studied by means of different methodologies: otholiths, vertebrae, spines and size frequency. The maximum reported age is 5 years. 0RVWRIWKHVWXGLHVDUHIURP0HGLWHUUDQHDQVWRFNV7KHUHDUHVHYHUDOVWXGLHVRQJURZWKELRORJ\RIERQLWRLQWKH Black Sea (Yoshida 1980) and WesWHUQ0HGLWHUUDQHDQ9RQ%HUWDODQII\JURZWKSDUDPHWHUVDUHVKRZHGLQWDEOH 1 for different areas. Rey et al. (1986) studied otoliths, vertebrae, spines and length frequencies and developed a growth equation based on a large number of specimens from western 0HGLWHUUDQHDQ DQG $WODQWLF DUHD QHDU Gibraltar strait. Recently, Santamaria et al. (2005) presents a estimate of growth rate, based on otolith analysis of juvenile fish IURP0HGLWHUUDQHDQ6HD -110 days) were 5.83 mm per day (range= 4.85-6.81 mm per day) and 4.15 g per day (range= 1.88-6.42 g per day). 7KHUHLVVRPHLQIRUPDWLRQIURPWDJJLQJRIERQLWRV'DWDIURPWZRILVKUHFDSWXUHGLQWKHZHVWHUQ0HGLWHUUDQHDQ Sea agreed with growth equation (Rey and Cort 1978; Rey et al. 1986). Table 1. Growth parameters for Atlantic bonito (LLQFP.LQ\-1, t0 in y). Growth Parameter Area Country Reference L k t 0 64 0.693 -1.42 Atlantic 0RURFFR 'DUGLJQDF 103 0.132 -1.8 %ODFN6HDDQG(DVWHUQ0HGLWHUUDQHDQ Russian Fed Zusser, 1954 67.8 0.795 %ODFN6HDDQG(DVWHUQ0HGLWHUUDQHDQ Turkey Tkacheva,