Browsing by Author "Aristizábal, Eddie O."

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    Desarrollo embrionario de Pagrus pagrus bajo distintas condiciones de salinidad y temperaturas de incubación
    (Instituto Nacional de Investigación y Desarrollo Pesquero, 2016) Berrueta, M. Mercedes; Suárez, Julieta; Aristizábal, Eddie O.
    Pagrus pagrus is a demersal species widely distributed in the Mediterranean and the eastern and western shores of the Atlantic Ocean. In Argentina it distributes naturally along the coast of the Buenos Aires Province between 10 and 50 m depth. The estimate of egg quality during the early stages of embryonic development is a useful predictive criterion to evaluate the potential of the species to produce juveniles. The aim of this study was to describe in detail the stages of embryonic development and larval hatching time under different conditions of salinity and temperature. The fertilized eggs obtained from natural spawning were incubated at 15, 30 and 40 salinity levels combined with 14 and 18 °C temperature. In the different experiments the embryonic stages were photomicrographed and structures described. Egg development was completed in all experiments made. At 18 °C the fully formed embryo hatched at 40 h postfertilization; at 14 °C hatching occurred 73 h after. The effect of salinity on embryonic development was reflected in an irregular growth of blastomeres during the cleavage stages at 15 and 40 salinity with a subsequent abnormal development of the caudal region in larvae incubated at said levels. Knowing the embryonic stages, sequence of segmentation, time of organ formation and duration of embryonic development until hatching is a basic requirement to evaluate the quality of egg batches devoted to mass larvae production.
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    Desove en cautiverio y calidad de los huevos y larvas del besugo, Pagrus pagrus (L.)
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 2006) Aristizábal, Eddie O.
    Spontaneous spawning of red porgy was achieved in captivity by using photoperiod and temperature control systems along the year. During a four-month reproduction period females released in average about 0.2 times their own body weight in oocytes with an energy content of 5.71 J mg-1 wet weight. A total of 28.8 x 106 eggs and approximately 200 g of viable eggs (wet weight) per female kg were obtained. The eggs and larvae quality in terms of hatching and larval survival rates experienced a significant variation during the spawning season ranging between 0%-92% and 0.3%-33.2% respectively. Comments in reference to the probable causes of these variations and the need of carrying on with this line of research are presented.
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    Modificación de la metodología utilizada en la producción de huevos del lenguado negro (Paralichthys orbignyanus) durante la temporada 2015-2016
    (Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 2017) Boccanfuso, Juan J.; Berrueta, M. Mercedes; Aristizábal, Eddie O.
    El lenguado Paralichthys orbignyanus es una especie nativa de interés comercial con gran potencial para la acuicultura costera o de aguas interiores. El objetivo del presente informe fue evaluar el efecto de la variación estacional de la salinidad sobre la cantidad y calidad de los desoves de los reproductores de lenguado del INIDEP. Para ello, la salinidad se modificó según las variaciones del fotoperiodo y temperatura a lo largo del año: a) otoño-invierno: 12-16ºC, salinidad 15-25, fotoperiodo natural e intensidad lumínica baja (10 lux), y b) primavera-verano: 16-19ºC, salinidad 34, fotoperiodo artificial e intensidad lumínica media (200 lux). El alimento suministrado a los reproductores fue: a) periodo de mantenimiento (otoño-invierno) alimentados principalmente con pejerrey (Odonthestes argentinensis) y b) periodo de vitelogénesis (primavera-verano) con pescado fresco compuesto por anchoíta (Engraulis anchoíta) y caballa (Scomber japonicus), además de un suplemento balanceado rico en vitaminas, astaxantina y ácidos grasos polinsaturados. El período reproductivo se extendió por 151 días, registrándose 52 puestas con un total de 14.289.661 de ovocitos liberados, de los cuales 5.404.870 (37,8%) fueron huevos viables obtenidos en 30 puestas. Estas cantidades representan el mayor número de puestas, mayor número de huevos totales y mayor número de huevos viables a lo largo de todas las temporadas en el INIDEP desde 2003.