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Anales del Instituto de la Patagonia

versión On-line ISSN 0718-686X


DE CARLI, Pedro; C. BRACCALENTI, Juan; GARCIA-DE-LEON, Francisco J  y  ACUNA GOMEZ, Eliana P. Argentine shrimp fishery Pleoticus muelleri (Crustacea: Penaeidae) in Patagonia, is it a single stock?. Anales Instituto Patagonia (Chile) [online]. 2012, vol.40, n.2, pp.103-112. ISSN 0718-686X.

Argentine shrimp fishery in Patagonia was managed since its beginning as a single stock. The fishery research done on this issue considered that the concept of stock unity and cohort monitoring could not be applied to Argentine shrimp fishery. The annual landings of shrimp presented significant variations in number, which could not been explained in an effective manner. This paper analyses the feasibility of recognizing different subunits of stock. The biological information available enables the recognition of three core areas of reproduction and growth: Rawson’s coastline area (43° 30’ S), and the northern (45° S) and southern (47° S) areas of the San Jorge Gulf. The available results of mark-recapture experiments indicate that a fraction of the population is born and develops in the southern area, remains in this area and will probably make a breeding contribution to the next generation. In the last decade, in the year 2001 when annual catches were the highest, the concentration of fishing activity in Rawson’s coastal area was found to be characterized by maximum yields and sizes. Nevertheless, these evidences are not sufficient and require other methods in order to differentiate the three proposed stock subunits. A population genetic analysis using molecular markers is proposed as a robust methodology, which would assess the genetic structure of the population and identify the existence of mixed stocks in the geographic area where the fishery is developed.

Palabras clave : Penaeid; management unit; San Jorge Gulf.

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