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Distribución y abundancia de huevos y larvas de langostino patagónico (Pleoticus muelleri) (Penaeoidea, Solenoceridae) en las temporadas estivales de 2008 y 2009

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Author
Moriondo Danovaro, P.
Date
2011

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Alternative Title
Distribution and abundance of eggs and larvae of red shrimp (Pleoticus muelleri) (Penaeoidea, Solenoceridae) in the 2008 and 2009 summer seasons
Abstract
The study on distribution and abundance of eggs and early planktonic stages of red shrimp, Pleoticus muelleri (Bate, 1888), contributes to a better knowledge of the species dynamics. Results from processing and analyzing 72 plankton samples collected with Bongo net during two research cruises on board of FV “Arbumasa XVIII” and RV “Capitán Oca Balda”, carried out in the Patagonian littoral in March 2008 and January 2009, are presented. In both cruises, eggs and larval stages were found all over the study area. The highest punctual densities of eggs were recorded in the area known as “La Pared” (46° 45’ S-65° 55’ W and 46° 50’ S-65° 55’ W). Eggs indicate the presence of shrimp reproductive concentrations which, while migrating eastwards towards waters of national jurisdiction, generate production scenarios characterized by high rates of catch per unit of effort and better commercial sizes. In the 2009 cruise, high densities of shrimp eggs were also found near Rawson area
El estudio de la distribución de las concentraciones y la obtención de índices de densidad de las fases prerreclutas del langostino patagónico, Pleoticus muelleri (Bate, 1888), contribuyen a un mayor conocimiento de la dinámica de la especie. Se analizaron 72 muestras de plancton obtenidas con red Bongo en dos campañas de evaluación de langostino a bordo del BP “Arbumasa XVIII” y del BIP “Capitán Oca Balda”, realizadas a lo largo del litoral norpatagónico y en el Golfo San Jorge, en marzo de 2008 y enero de 2009, respectivamente. En ambas campañas se encontraron huevos y larvas en toda el área de estudio. Las densidades más altas de huevos se localizaron en la zona conocida como “La Pared” (46° 45’ S-65° 55’ W y 46° 50’ S-65° 55’ W). Los huevos indican la presencia de concentraciones reproductivas hacia el este (en zonas no aptas para el arrastre) que, al cumplir con el habitual ciclo migratorio generan, en aguas nacionales, un escenario de producción caracterizado por altos niveles de captura por unidad de esfuerzo y mejores tamaños comerciales. En la campaña de enero de 2009 se encontraron, asimismo, importantes concentraciones de huevos de langostino en la zona de Rawson
Journal
INIDEP informe técnico
Volume
83
Pages
issue:83 p.14 pp
Publisher or University
INIDEP
URI
http://hdl.handle.net/1834/4880
Collections
INIDEP Informe Técnico

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