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Redalyc.A Review of the Flatfish Fisheries of the South Atlantic Ocean Revista de Biología Marina y Oceanografía ISSN: 0717-3326 [email protected] Universidad de Valparaíso Chile Díaz de Astarloa, Juan M. A review of the flatfish fisheries of the south Atlantic Ocean Revista de Biología Marina y Oceanografía, vol. 37, núm. 2, diciembre, 2002, pp. 113-125 Universidad de Valparaíso Viña del Mar, Chile Available in: http://www.redalyc.org/articulo.oa?id=47937201 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Revista de Biología Marina y Oceanografía 37 (2): 113 - 125, diciembre de 2002 A review of the flatfish fisheries of the south Atlantic Ocean Una revisión de las pesquerías de lenguados del Océano Atlántico sur Juan M. Díaz de Astarloa1 2 1CONICET, Departamento de Ciencias Marinas, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Funes 3350, 7600 Mar del Plata, Argentina. [email protected] 2 Current address: Laboratory of Marine Stock-enhancement Biology, Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, kitashirakawa-oiwakecho, sakyo-ku, Kyoto, 606-8502 Japan. [email protected] Resumen.- Se describen las pesquerías de lenguados del Abstract.- The flatfish fisheries of the South Atlantic Atlántico sur sobre la base de series de valores temporales de Ocean are described from time series of landings between desembarcos pesqueros entre los años 1950 y 1998, e 1950 and 1998 and available information on species life información disponible sobre características biológicas, flotas, history, fleets and gear characteristics, and economical artes de pesca e importancia económica de las especies importance of commercial species. comerciales. In the southwest Atlantic, paralichthyid flounders, mostly Los lenguados de la familia Paralichthyidae, principalmente Paralichthys patagonicus, P. orbignyanus and Xystreurys Paralichthys patagonicus, P. orbignyanus y Xystreurys rasile rasile are intensely exploited. While in southern Brazil, son intensamente explotados en el Atlántico suroccidental. En landings of these species reached a maximum of 1 892 t in el sur de Brasil las capturas de estas especies alcanzaron un 1989, in Argentina exceeded 10 000 t annually between 1989 máximo de 1.892 t en 1989, mientras que en Argentina and 1998. In the south-east Atlantic, the west coast sole, excedieron anualmente el valor de 10.000 t entre 1989 y 1998. Austroglossus microlepis, and the Agulhas sole, A. pectoralis, En el Atlántico suroriental, el lenguado austral oeste, although account for a minor percentage of the annual South Austroglossus microlepis y el lenguado de fango, A. pectoralis African trawlfish catch, they are by far the most valuable fish representan un pequeño porcentaje de las capturas de arrastre per unit weight landed and are therefore the main target of the en Sudáfrica, sin embargo constituyen los pescados más small trawlers. valiosos por unidad de peso y por lo tanto el principal objetivo Landings of west coast sole peaked at nearly 2 000 t in 1972 de los pequeños barcos arrastreros. but have declined steeply since then. Trawling is the most Los desembarques del lenguado austral oeste alcanzaron casi important method used in fishing for flatfish in the south-west las 2.000 t en 1972, pero luego dicho valor declinó Atlantic. Double-rig trawling, twin nets and entangling nets notablemente. La pesca de arrastre es el método más are employed for flatfish fishing. In the south-east Atlantic, importante utilizado en la pesca de lenguados en el Atlántico the main flatfish catches are taken as by-catch in the demersal suroccidental. La pesca con tangones y redes de enmalle son trawls fisheries. Flatfish represent a relatively small fraction of usadas para la pesca de lenguados. En el Atlántico suroriental, the total landings in both the south-west and south-east las principales capturas de lenguados se obtienen como fauna Atlantic, compared with other demersal fish species as hake. acompañante en las pesquerías de arrastre demersal. Los lenguados representan, tanto en el Atlántico suroccidental Key words: Paralichthys spp., Austroglossus spp., fisheries, como suroriental, una fracción relativamente pequeña del total south Atlantic de las capturas comparado con otras especies de peces demersales como la merluza. Palabras clave: Paralichthys spp., Austroglossus spp., pesquerías, Atlántico sur Introduction among the most productive demersal fisheries from the commercial view point in the world. Although flatfishes The flatfishes constitute important commercial and account for a little amount of annual trawlfish catch in recreational fisheries throughout the Atlantic from the comparison to other demersal Atlantic fisheries such deep Arctic to the southern hemisphere and around the cod and hake, they are by far the most valuable fish per coasts of southern Africa and south America. They are unit weight landed. They are regarded as “fine fishing” 114 Revista de Biología Marina y Oceanografía Vol. 37, Nº 2, 2002 due to their value as a food fish, and as a consequence, Regarding Paralichthyidae only the most important the price in the market is high (Díaz de Astarloa & commercial species are listed as follows: Paralichthys Munroe 1998, Fabré & Díaz de Astarloa 2001). brasiliensis (Ranzani), P. isosceles Jordan, P. orbignyanus (Valenciennes), P. patagonicus Jordan, P. Based on the analysis of the landings and the life triocellatus Miranda Ribeiro and Xystreurys rasile history of the most important species, this paper (Jordan). describes the development of the flatfish fisheries in the south Atlantic since 1950 and discusses its present state P. brasiliensis is a shallow-water species occurring and future development. up to 40-m depth. It commonly inhabits bays, beach zones and estuarine areas on muddy and sandy bottoms Materials and Methods in northeastern Brazil from São Luiz do Maranhão south to Rio de Janeiro (Figueiredo & Menezes 2000). It can Landing statistics, description of fleets and fishing gears attain up to 1-m length and it is considered one of the were obtained from published reports of the Food, finest flatfish in the region (Carvalho-Filho 1999). Fishing, Cattle and Agriculture Secretariat of Argentina (SAGPyA 1999), Fisheries Department of the Food and P. isosceles and P. triocellatus are both endemic Agriculture Organisation (FAO 2000), and Brazilian species of the Argentine Zoogeographical Province National Environment and Fisheries Agency (IBAMA (Figueiredo 1981). P. triocellatus is distributed 1998). Geographical distribution and biological approximately from Rio de Janeiro (25ºS) south to information of some flatfish species were obtained from Uruguay, while P. isosceles occurs from Paraná literature and unpublished data, as well. (26º30’S) as far south as San Jorge Gulf, Argentina (46ºS) (Figueiredo & Menezes 2000). They are Results and Discussion bathymetrically distributed between 50 and 180-m depth Main species (Bittencourt 1982). They generally do not exceed 40- cm total length. P. isosceles is typical in the region of its Southwest Atlantic occurrence throughout the year (Haimovici et al. 1994). Approximately 45 flatfish species belonging to six P. patagonicus is widely distributed from Rio de Families (Pleuronectidae, Achiridae, Bothidae, Janeiro to at least as far south as northern Patagonia Paralichthyidae, Cynoglossidae and Achiropsettidae) (43ºS) (Díaz de Astarloa 1994). Although it occurs in occur in the southwest Atlantic southward to the shallow waters up to 200-m depth, is commonly Amazon river. Not all of them are of commercial captured between 70 and 100 m (Carneiro 1995, Díaz de importance due to small sizes or either low abundance. Astarloa & Munroe 1998). It is the most economically Only the pleuronectids and paralichthyids are the most important paralichthyid flounder in the southwest economically important because they are very tasty Atlantic since the high abundance and the big sizes that flatfishes and the fish products have a high price in the the flatfish attains, compared to other flatfishes market. occurring in the area (Díaz de Astarloa 1994). It is also the main species of flounder landed from commercial Pleuronectidae is represented by Oncopterus bottom trawl fisheries on the continental shelf and darwinii Steindachner, 1874. The species attains up to coastal shallow-waters in southern Brazil (Carneiro 35-cm total length and is distributed from Santa 1995). Although flatfish species are not distinguished in Catarina (Brazil) southward to Península Valdés commercial landings throughout the region and only (Argentina) in waters shallower than 50 m (Fabré & one category of flatfishes instead of by species appears Díaz de Astarloa 1996). The quality of the meat has in the statistics, it was demonstrated that P. patagonicus long been appreciated in Brazil where it is fished by is the most abundant landed species representing 96.3% artisanal boats (wood fishing boats measuring up to 15 of the total flatfish species landed in Rio Grande do Sul m long) with gill nets in coastal waters at depths of less (Haimovici 1998) and 70% of the whole flatfishes than 40 m (Reis et al. 1994). However, it rarely appears landed in Argentina (Cousseau & Fabré 1990, Fabré & in the fish market due to its very low abundance. In Díaz de Astarloa 1996). Argentina, artisanal
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