An assessment survey on the austral fish was carried out during the summer 1997 on both the shelf... more An assessment survey on the austral fish was carried out during the summer 1997 on both the shelf and slope off southern Argentina. The cruise covered 101,508 nm2 between 45ø and 54ø 30'S and depths between 50 and 400 m. The survey did not include the area controlled ...
Summer temperature and salinity data in the nursery ground of the Patagonian stock of Argentine h... more Summer temperature and salinity data in the nursery ground of the Patagonian stock of Argentine hake Merluccius hubbsi recorded from 1996 to 2001 were analyzed. These oceanographic variables were related to variations in the hake population abundance by means of a general linear model. Mean values and anomalies of bottom temperatures and salinity fields were determined. The most extreme positive thermal anomalies occurred in 1999 and 2000, whereas 1996 was the coldest year. The salinity anomaly was lowest in 1996 and highest in 2000. Argentine hake was found mainly in thermal and saline gradient zones. Juveniles were found mainly within the San Jorge Gulf with temperatures ranging from 8º to 10ºC and salinities of 33.2 to 33.6, whereas adults were located inside and outside the gulf, where bottom water temperatures oscillated between 8º and 12ºC and salinities ranged from 33.2 to 33.5. Juvenile densities were highest in shallower waters with higher salinities and lower temperatures ...
... Se trata de una capa de pequeño espesor (20 m) de aguas de plataforma que han sido diluídas p... more ... Se trata de una capa de pequeño espesor (20 m) de aguas de plataforma que han sido diluídas por el apoIte de aguas continentales ... Esta elevada salinidad es probable que conesponda a aguas de platafor-ma que reciben aguas de la zona de Bahía Blanca "generadora" de ...
... Raúl Reta, Rut Akselman, Federico J. Castro Machado, A. David Garciarena, Gustavo J. Macchi, ... more ... Raúl Reta, Rut Akselman, Federico J. Castro Machado, A. David Garciarena, Gustavo J. Macchi, Paula Moriondo Danovaro, Virginia Llanos y José R ... Salinity values allowed to detect two hydrographic regimes: that of the San Matías Gulf (33.8-34.4) located to the west and ...
Page 1. Unusual finding of Paranotothenia magellanica (Nototheniidae) on the temperate north coas... more Page 1. Unusual finding of Paranotothenia magellanica (Nototheniidae) on the temperate north coast of Argentina by Daniel E. FIGUEROA (1), Juan M. DÍAZ DE ASTARLOA (1, 2) & Raúl RETA (1, 3) Cybium 2005, 29(1): 97-99. ...
The spatial variation of the spawning shoals of M. hubbsi in Patagonia during its reproductive pe... more The spatial variation of the spawning shoals of M. hubbsi in Patagonia during its reproductive peak (January) between 2001 and 2008 was analyzed. In 2001 and 2004 spawning of hake in the north-patagonian area was concentrated inshore between 50 m and 80 m depths, in coincidence with a bottom thermal front (9° - 14° C). Since 2005 an expansion of spawning into deeper waters (near the 100 m isobath), where bottom temperature ranged between 6° and 8° C, was observed. This offshore group was characterized by a high proportion of females (0.58 - 0.78), larger (modes 53 - 62 cm TL) than those of the coastal region (modes 40 - 45 cm TL). The relative fecundity and oocytedry weight values were lower in the offshore spawning area than those obtained for the inshore reproductive ground. This observation could indicate that the offshore group corresponds to hake females at the end of spawning in migration to deeper waters.
Journal of the Marine Biological Association of the UK, 2003
The first documented record of the Indo-west Pacific pufferfish Arothron firmamentum was reported... more The first documented record of the Indo-west Pacific pufferfish Arothron firmamentum was reported off Mar del Plata, Argentina at a depth of ∼45 m and is the first occurrence of the starry toadfish in American Atlantic waters. Some morphological and biological characteristics are given for the two specimens caught. Different explanations of how the two pufferfish specimens arrived in south Atlantic waters are discussed.
Only physical aspects of the Subtropical Shelf Front (STSF) have been described for the Southwest... more Only physical aspects of the Subtropical Shelf Front (STSF) have been described for the Southwest Atlantic Continental Shelf. The main goal of this paper is to present results of an integrated physical, chemical and biological study at the STSF conducted during the winter of 2003 and summer of 2004. A cross section was established at the historical determined location of
An assessment survey on the austral fish was carried out during the summer 1997 on both the shelf... more An assessment survey on the austral fish was carried out during the summer 1997 on both the shelf and slope off southern Argentina. The cruise covered 101,508 nm2 between 45ø and 54ø 30'S and depths between 50 and 400 m. The survey did not include the area controlled ...
Summer temperature and salinity data in the nursery ground of the Patagonian stock of Argentine h... more Summer temperature and salinity data in the nursery ground of the Patagonian stock of Argentine hake Merluccius hubbsi recorded from 1996 to 2001 were analyzed. These oceanographic variables were related to variations in the hake population abundance by means of a general linear model. Mean values and anomalies of bottom temperatures and salinity fields were determined. The most extreme positive thermal anomalies occurred in 1999 and 2000, whereas 1996 was the coldest year. The salinity anomaly was lowest in 1996 and highest in 2000. Argentine hake was found mainly in thermal and saline gradient zones. Juveniles were found mainly within the San Jorge Gulf with temperatures ranging from 8º to 10ºC and salinities of 33.2 to 33.6, whereas adults were located inside and outside the gulf, where bottom water temperatures oscillated between 8º and 12ºC and salinities ranged from 33.2 to 33.5. Juvenile densities were highest in shallower waters with higher salinities and lower temperatures ...
... Se trata de una capa de pequeño espesor (20 m) de aguas de plataforma que han sido diluídas p... more ... Se trata de una capa de pequeño espesor (20 m) de aguas de plataforma que han sido diluídas por el apoIte de aguas continentales ... Esta elevada salinidad es probable que conesponda a aguas de platafor-ma que reciben aguas de la zona de Bahía Blanca "generadora" de ...
... Raúl Reta, Rut Akselman, Federico J. Castro Machado, A. David Garciarena, Gustavo J. Macchi, ... more ... Raúl Reta, Rut Akselman, Federico J. Castro Machado, A. David Garciarena, Gustavo J. Macchi, Paula Moriondo Danovaro, Virginia Llanos y José R ... Salinity values allowed to detect two hydrographic regimes: that of the San Matías Gulf (33.8-34.4) located to the west and ...
Page 1. Unusual finding of Paranotothenia magellanica (Nototheniidae) on the temperate north coas... more Page 1. Unusual finding of Paranotothenia magellanica (Nototheniidae) on the temperate north coast of Argentina by Daniel E. FIGUEROA (1), Juan M. DÍAZ DE ASTARLOA (1, 2) & Raúl RETA (1, 3) Cybium 2005, 29(1): 97-99. ...
The spatial variation of the spawning shoals of M. hubbsi in Patagonia during its reproductive pe... more The spatial variation of the spawning shoals of M. hubbsi in Patagonia during its reproductive peak (January) between 2001 and 2008 was analyzed. In 2001 and 2004 spawning of hake in the north-patagonian area was concentrated inshore between 50 m and 80 m depths, in coincidence with a bottom thermal front (9° - 14° C). Since 2005 an expansion of spawning into deeper waters (near the 100 m isobath), where bottom temperature ranged between 6° and 8° C, was observed. This offshore group was characterized by a high proportion of females (0.58 - 0.78), larger (modes 53 - 62 cm TL) than those of the coastal region (modes 40 - 45 cm TL). The relative fecundity and oocytedry weight values were lower in the offshore spawning area than those obtained for the inshore reproductive ground. This observation could indicate that the offshore group corresponds to hake females at the end of spawning in migration to deeper waters.
Journal of the Marine Biological Association of the UK, 2003
The first documented record of the Indo-west Pacific pufferfish Arothron firmamentum was reported... more The first documented record of the Indo-west Pacific pufferfish Arothron firmamentum was reported off Mar del Plata, Argentina at a depth of ∼45 m and is the first occurrence of the starry toadfish in American Atlantic waters. Some morphological and biological characteristics are given for the two specimens caught. Different explanations of how the two pufferfish specimens arrived in south Atlantic waters are discussed.
Only physical aspects of the Subtropical Shelf Front (STSF) have been described for the Southwest... more Only physical aspects of the Subtropical Shelf Front (STSF) have been described for the Southwest Atlantic Continental Shelf. The main goal of this paper is to present results of an integrated physical, chemical and biological study at the STSF conducted during the winter of 2003 and summer of 2004. A cross section was established at the historical determined location of
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