Revista de Investigación y Desarrollo Pesquero 1980 Nro 2

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    Observaciones sobre diferencias morfólogicas entre la merluza común (Merluccius hubbsi)y la merluza austral (Merluccius polylepis)
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 1980) Cotrina, C.P.; Cousseau, M.B.
    The species of the Genus Merluccius present in argentine waters, Merluccius hubbsi and M.polylepis are similar externally and it is very difficult to separate them in the capture. Knowing the importance of both species from the commercial point of view, and the need of a correct identification, some morphological characteristics have been compared, looking for external differences, useful for the identification on board. The samples have been taken from the total area of distribution of both species in argentine waters. A total of 154 specimen of Merluccius hubbsi and 105 of M.polylepis were analyzed.
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    Abundancia relativa y rendimiento máximo sostenible de la merluza común (Merluccius hubbsi)
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 1980) Otero, H.O.
    The statistics provided by the Argentinean Fishing Vessel and the biological data collected by scientist in the last eleven years, allow us to estimate different aspects of the population dynamics of the common hake (Merluccius hubbsi). This work deals with the relative abundance and the maximal sustainable yield of this species, considering the bonaerense stock of the Southewest Atlantic. Analyzing the effective fishing density, concluding remarks can be made. The high catches of 1967 (more than 600.000 tons.) made by the Russian Fleet, affected the fishing density in 1968. Since 1969, the resource recovered the high density level as a consequence of a decrease in the catches and in the fishing effort, but vulnerability of the stock is shown.
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    Distribución, áreas de concentración y estructura de la población del bacalao austral (Salilota australis, Gunther 1887) del Atlántico Sudoccidental
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 1980) Perez Comas, J.A.
    The 'bacalao austral' is a typical fish from the cold water of the Southwest Atlantic and the Southeastern Pacific oceans, whose fishery has not yet developed. In this work, the structure of the concentration areas of summer and winter distribution and other biological items were analyzed, basing on data provening from R/V 'Walther Herwig' and R/V 'Shinkai Maru', which operated in these waters during 1978/79/. The trophic vertical migrations are common in this species.
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    Nota sobre la consideración de retardos en un modelo de pesquerías
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 1980) D'Attellis, C.E.
    In the application of some techniques for the estimation and the regulation of fishery models with delays, it is necessary to have a validated linear model. In this note, we construct such a linear model using the Paunter approximation for delays.
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    Fertilidad y periodicidad del desove en Ostrea puelchana
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 1980) Morriconi, E.; Calvo, J.
    Larvae production by Ostrea puelchana was studied in colections obtained from November to March 1977-78 and 1978-79. During the first period there seems to be a direct relation between the highest percentage of gravid female and the moon crescent quarter. This relation is not repeated in the following year. Compared with other larviparous oysters, O.puelchana produces a greather number of embryons of smaller size, with shorter breeding period and longer planktonic life.