Browsing by Author "Ehrlich, Martín D."

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    Distribución de huevos, larvas y prerreclutas de merluza (Merluccius hubbsi) en la Zona Común de Pesca Argentino-Uruguaya. Período 1999-2001
    (Mar del Plata : Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 2006) Machinandiarena, L.; Brown, Daniel R.; Ehrlich, Martín D.; Pájaro, Marcelo; Dorado, J.; Teso, V.
    Distribution and abundance of eggs, larvae and prerecruit stages of Merluccius hubbsi were evaluated to examine spawning, nursery and settlement areas in the Argentine-Uruguayan Common Fishing Zone during the 1999-2001 period. Larvae and prerecruit stages were more abundant at stations from 50 m to 100 m depth. The nursery area would extend from the 50 m isobath south of 37° S to the 200 m isobath northward where the shelf becomes narrower. In the whole sampling area small size prerecruits were caught; therefore, the whole zone should be considered as a potential settlement area.
  • No Thumbnail Available
    Item
    Distribución y abundancia de larvas de peces en el Frente Patagónico del Talud
    (Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 2024) Ehrlich, Martín D.; Acha, E. Marcelo; Betti, Paola; Do Souto, Marina; Cadaveira, Mariana; Machinandiarena, Laura
    Dentro de la iniciativa Pampa Azul se incluye el área geográfica prioritaria denominada Agujero Azul, que está caracterizada por la presencia del Frente de Talud que separa aguas de plataforma de aquellas de la Corriente de Malvinas. En la campaña realizada en la primavera austral de 2017, se estudió la distribución y abundancia del ictioplancton colectado en 48 estaciones ordenadas en tres transectas perpendiculares a las isobatas. Se obtuvieron 2.700 larvas pertenecientes a 10 órdenes y 16 familias. El muestreo abarcó el borde de plataforma, talud y aguas oceánicas hasta los 3.160 m de profundidad. Se encontraron, en el borde de la plataforma, escasas larvas de cabrilla Sebastes oculatus, nototenia Patagonothoten ramsayi y merluza de cola Macruronus magellanicus. En el talud se observaron larvas de mictófidos y granaderos mientras que en el área oceánica predominaron larvas de peces mesopelágicos de diferentes familias. Este estudio es el primero en lograr obtener un cuadro detallado de la composición ictioplanctónica en el ecosistema del Frente Patagónico del Talud.
  • No Thumbnail Available
    Item
    Fecundidad parcial y frecuencia reproductiva del efectivo patagónico de merluza (Merluccius hubbsi)
    (Mar del Plata: Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), 2006) Pájaro, Marcelo; Macchi, Gustavo J.; Ehrlich, Martín D.
    Batch fecundity and spawning frequency of Argentine hake inhabiting Patagonian waters south of 41° S were estimated using monthly samples collected during the December 2000-March 2001 reproductive season and at the end of the March 2002 spawning period. Batch fecundity was fitted to a power function of total length and a linear function of ovary-free female weight with values ranging between 100,000 (32 cm total length) and 2,300,000 (87 cm total length) hydrated oocytes. Batch and relative fecundity showed variations during the spawning season with a marked decrease towards the end of the reproductive period (March). The spawning frequency, which ranged between 0.10 and 0.15, was estimated from the proportion of females with day-1 postovulatory follicles and was higher during the spawning peak (January-February). At these frequencies, a female hake would spawn, on average, 14 times between December and March. Both, batch fecundity and spawning frequency showed higher variability within the same reproductive season than between years