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- ItemEcología trófica de la caballa del Mar Argentino (Scombridae, Scomber japonicus marplatensis). Parte I. Alimentación y crecimiento(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 1979) Angelescu, VíctorThe present study describes the morphology of the digestive system, the feeding and feeding behaviour, and the trophic relationships of the mackerel in the coastal waters regions, pelagic zone, along the Province of Buenos Aires. At the same time, this study is completed with a bioestatistical analysis on growth rhythm of body length and body weight of secondary juveniles, pre-adults and adults. All the biological information and statistical data correspond, only to the period november-march and the summer trophic habitat area.
- ItemVariaciones en la composición bioquímica proximal de la anchoíta durante tres temporadas de pesca (1975-1977)(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 1979) Moreno, V.J.; Aizpún de Moreno, Julia E.; Malaspina, A.M.Seasonal variations in major biochemical compoenets (lipids, protein and water) as well as in ash content of muscle and filletin remains of Engraulis anchoita were studied separately along three consecutive fishing seasons (May-December 1975, 1976 and 1977). Five to ten adult fish of each sex and of nearly identical length (total length: 160-165 mm) were selected at approximately monthly intervals from commercial catches at Mar del Plata Harbour. During the course of the three sampling periods, the proportions of the different biochemical components showed a very similar pattern of variation and the difference from one fishing season to another never exceeded one month.
- ItemUn modelo estocástico de pesquerías(Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 1979) Gregorio, C.G.; D'Attellis, C.E.Based on the Schaefer production model, an stochastic model is described, that is a model in which noises perturbing biomass and measurements are considered, serving to describe random variations in mortality and recruitment as well as some inaccuracies in measurements taken. The model is discrete, linear and adaptable, and the parameters biomass and noises intensities are restimated with each new measurement obtained. The problem of regulation is solved, on the basis of the model described, through fishing effort that should be applied to keep biomasss close to equilibrium. Computer effected simulations are presented.