Browsing by Author "Mabragaña, Ezequiel"

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    Clave de identificación de cápsulas de huevos de condrictios del Mar Argentino
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero, 2009) Mabragaña, Ezequiel; Figueroa, Daniel E.; Scenna, Lorena B.; Díaz de Astarloa, Juan Martín; Colonello, Jorge H.; Massa, Ana M.
    Twenty eight species of oviparous chondrichthyans were reported on the Argentine Continental Shelf (SW Atlantic). The egg cases laid on the sea bed provide useful information to identify species, eggs laying areas and seasons. Based on the analysis of 155 egg cases corresponding to 21 chondrichthyan species, an illustrated field guide for a correct identification is presented.
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    Distribución y abundancia de cápsulas de huevo y aspectos del desarrollo embrionario de las rayas Bathyraja brachyurops y Bathyraja macloviana en la plataforma bonaerense
    (Instituto Nacional de Investigación y Desarrollo Pesquero, 2016) Vazquez, Diego M.; Gabbanelli, Valeria; Díaz de Astarloa, Juan Martín; Mabragaña, Ezequiel
    In this work the distribution and abundance of egg cases of skates Bathyraja brachyurops and B. macloviana on the Buenos Aires continental shelf and the Mar del Plata submarine canyon are analyzed and stages of embryonic development described. Although distribution, similar for both species, was registered south of 37° S at 84-215 m depth, some cases of B. macloviana were found down to 1,395 m. The highest abundance of B. brachyurops was recorded between 97-145 m and 251 m and that of B. macloviana at 94-105 m. Results indicate similar oviposition areas that coincide with the Argentine break front and the Patagonian scallop banks. Cases with embryos in different stages of development were collected. The anatomical structures, similar for both species in the first stages, showed differences in spinulation and pigmentation in the final ones. In both species early stages of development were found between July and September. The different stages observed in B. brachyurops embryos in July suggest oviposition at different times of the year. Those of B. macloviana found in the same stage in different seasons and in different stages in the same season suggest a similar oviposition pattern.
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    Salida de Prueba - Buque Oceanográfico ARA "Puerto Deseado", enero 2016
    (Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 2016) Schejter, Laura; Cubiella, Álvaro H.; Delpiani, Sergio M.; Vázquez, Martín; Mabragaña, Ezequiel
    Los días domingo 17 y lunes 18 de enero de 2016, se realizó una salida de prueba a bordo del buque oceanográfico ARA "Puerto Deseado" para chequear el correcto funcionamiento del guinche de pesca y de los equipos de CTD que se espera utilizar en la campaña de Burdwood, planificada para el mes de marzo, luego del retorno del buque de la Campaña Antártica de Verano. El resultado de las pruebas fue satisfactorio.