Browsing by Author "Cousseau, M.B."

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    Algunas características de la estructura y del comportamiento migratorio de los cardúmenes de caballa (Scomber japonicus marplatensis) en la plataforma bonaerense (Mar Argentino) : período 1965-1984
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 1987) Cousseau, M.B.; Angelescu, Víctor; Perrotta, R.G.
    Three periods were distinguished during the analyzed years: the first one (1965-1975) may be defined as "normal fishing seasons" occurring from October to March, with catches between 8,000 and 14,000 tons.
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    Características poblacionales de la anchoíta (Engraulis anchoita) del Mar Argentino. Parte I. El largo medio al primer año de vida, crecimiento y mortalidad
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 1984) Hansen, J.E.; Cousseau, M.B.; Gru, D.L.
    A total of 7263 otoliths were collected from anchovy samples taken during two pelagic cruises which were carried out in the Spring of 1978. An statistical analysis of back calculated length distributions of one-year-old fish (L1) was made. The L1 mean values taken by geographical latitude form a cline, with higher values in the northern samples, and decreasing Southwards. Within this latitudinal gradient two main anchovy populations can be identified, one in the region of Buenos Aires Province and the other in Patagonian waters. The L1 of the females is significatively larger than that of the males for the former population, whereas in the Patagonian area differences between sexes are not significant. The parameters of the von Bertalanffy Growth curves, as well as the instantaneous total mortality rates (Z), were estimated for both populations by each cruise.
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    Estudio de edad y crecimiento de la sardina fueguina (Sprattus fuegensis) de las costas de la provincia de Santa Cruz e Islas Malvinas
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 1982) Cousseau, M.B.; Gru, D.L.
    Samples of Sardina fueguina (Sprattus fuegensis) were taken during research cruises carried out in 1974 and 1978. Length and age frequency distributions were analyzed, and von Bertalanffy growth parameters were calculated for the coastal waters of two geographical regions: Province of Santa Cruz and northern part of Malvinas Islands. Lenght and weight growth curves have been calculated for each region and each year. Marked differences have been found between gowth parameters of both regions, and the calculated values showed a good fit with the observed ones. According to these results, it is possible to assume that the sardines of both regions constitute two different populations. However, more information on the total distribution of the species will have to be obtained in order to confirm the present observations.
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    Estudios sobre el régimen alimentario del mero (Acanthistius brasilianus) y su relación con las características morfométricas del sistema digestivo (Pisces, Fam.Serranidae)
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 1987) Goldstein, H.E.; Cousseau, M.B.
    Observations on the stomach content of the sea bass have been made in order to study the trophic spectrum and the feeding habits variations, according to the season, region and individual size. On the other hand, some morphometric and meristic characters of the buccopharyngeal cavity have been statistically analyzed in relation with the total length and compared with size and shape of the preys. The following characters were studied; length and width of the mouth; size of branchial arch; number and length of the gillrakers and distance between them.
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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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    Revisión taxonómica y análisis de los caracteres morfométricos y merísticos de la sardina fueguina, Sprattus fuegensis (Jenyns, 1842) (Pisces, Clupeidae)
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 1982) Cousseau, M.B.
    This paper is based on the study of 484 specimens collected off three different districts of Santa Cruz (Caleta Olivia, Puerto Deseado and Río Gallegos)and the northern coastal region of Malvinas Islands. The following items have been developed: -a brief description of the clupeoids present in the southern patagonic area where the sardine lives, and a key to their identification; -the updated systematic position of the species and its bibliographical references; -a description of the external morphology; -a statistical analysis of morphometric and meristic character; and geographic distribution and movements. It is possible to presume the existence of two geographically separated groups, one in the coasts off Santa Cruz Province and another around Malvinas Islands.