131 research outputs found
Paralichthys patagonicus spawning areas and reproductive potential in the Bonaerense Coastal Zone, Argentina (34º-42ºS)
No full textParalichthys patagonicus reproductive biology was studied using macroscopic and histological analysis of gonads in waters of Argentinean Coastal Zone (34º-42ºS) during December 2003 and 2005. Data were analyzed taking into account two population groups, one in the northern zone (34º-38ºS) and another in El Rincón (38º-42ºS). The size at first maturity (L50) estimated P. Patagonicus showed differences between years and populations groups. The size at first maturity for both sexes in 2003 was 31.57 cm TL for the northern zone and 29.58 cm TL for El Rincon. In 2005 it was only able to estimate the L50 to the northern zone and the value obtained was less than 2003 (27.82 cm TL). During December 2003 most of hydrated or ripe females were detected within El Rincón. However, in December 2005 the highest proportion of spawning females was observed in the external sector of the Rio de la Plata, possibly due to the colder temperatures observed in the northern area relative to 2003. Batch fecundity was fitted to a power function of length and linear function of ovary free female weight and ranged from 14,685 (30 cm TL) to 153,717 (59 cm TL) hydrated oocytes. Relative fecundity oscillated between 24 and 170 hydrated oocytes/g. The values these parameters differed between years and among population groups. These differences could be attributed in part to the difference in seawater temperature between the two years, especially at high temperatures observed in 2005Se estudió la biología reproductiva del lenguado (Paralichthys patagonicus) en la Zona Costera Bonaerense (34º-42ºS). El material provino de muestreos realizados durante diciembre de 2003 y 2005. En base a la bibliografía los datos fueron analizados teniendo en cuenta dos grupos poblacionales, uno en el norte (34-38ºS) y otro en El Rincón (38-42ºS). La estimación de la talla de primera madurez en 2003 para ambos sexos fue de 31.57 cm LT para la zona norte y de 29.58 cm LT para El Rincón. En 2005 solo se pudo estimar el L50 para la zona norte y el valor obtenido fue menor al 2003 (27.82 cm LT). En diciembre del 2003 la mayor actividad reproductiva tuvo lugar en El Rincón. Sin embargo, en diciembre de 2005 las proporciones más altas de hembras hidratadas se localizaron en el sector norte. Esto podría deberse a que se registraron temperaturas más frías para esta zona respecto a 2003. La fecundidad parcial presentó un ajuste potencial con la talla y lineal con el peso y varió entre 14.685 (30cm TL) y 15.3717 (50 cm TL) ovocitos hidratados. La fecundidad relativa varió entre 24 y 170 ovocitos hidratados/g. Los valores de ambos parámetros presentaron diferencias tanto interanuales como entre los grupos poblacionales. Estas diferencias podrían atribuirse en parte a la diferencia en la temperatura del agua entre los dos años, especialmente a las altas temperaturas observadas en 2005.Fil: Militelli, Maria Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentin
Reproductive activity of the Argentine sandperch (pseudopercis semifasciata) in coastal waters off the buenos aires province during the 2012-2014 period.
No full textSe analizó la biología reproductiva del salmón de mar, Pseudopercis semifasciata, en aguas costeras bonaerenses cercanas al puerto de Quequén / Necochea. El material provino de muestreos de desembarque realizados por el INIDEP durante los años 2012, 2013 y 2014. A partir del estudio de los estadios de madurez gonadal se determinó que la época reproductiva de esta especie en el área se extiende desde agosto a febrero, evidenciado por un marcado aumento en el Índice gonadosomático y debido a la presencia de hembras en puesta o con folículos postovulatorios (indicadores de desoves recientes). La fecundidad parcial mostró una relación positiva con la talla y con el peso de las hembras libre de ovarios, el valor medio fue de 93.483 ovocitos hidratados. La fecundidad relativa varió entre 18 y 51 ovocitos hidratados por gramo de hembra (libre de ovarios) y mostró una relación lineal negativa con la talla y el peso de las hembras. El peso seco, y diámetro de los ovocitos hidratados y de la gota oleosa no presentaron relaciones significativas con las características maternas. Los mayores desembarques se produjeron en los meses de marzo, septiembre y octubre, coincidiendo estos dos últimos con el momento de mayor actividad reproductiva de la especie.The reproductive activity of Argentine sandperch (Pseudopercis semifasciata) in the Buenos Aires Province coastal waters close to the Quequén/Necochea port, Buenos Aires, Argentine sea, was analyzed. The material derived from landing samplings performed by the Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) in the 2012-2014 period. The study of gonadal maturity stages allowed to determine that the species reproductive time in the area extends from August through February, with a marked increase of the gonadosomatic index and the presence of females in spawning activity or with postovulatory follicles, indicators of recent spawnings. Batch fecundity, that showed a positive relationship with the length and weight of ovary-free females, had a mean value of 93,483 hydrated oocytes. Relative fecundity varied between 18 and 51 oocytes per gram of ovary-free female and showed a negative linear relationship with length and weight. The dry weight and diameter of hydrated oocytes and the oily drop did not relate to the maternal characteristics in a significant way. The largest landings, that took place in March, September and October, showed that the last two months coincided with the time of the highest reproductive activity of the species.Fil: López, Sofía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; Argentina. Instituto Nacional de Investigaciones y Desarrollo Pesquero; ArgentinaFil: Militelli, Maria Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; Argentina. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentin
Dinámica reproductiva en el dominio demersal
No full textSe describen las estrategias reproductivas de las principales pesquerías demersales de la región Iberoamericana. Se analizan los principales rasgos reproductivos, tipo de desove, fecundidad, frecuencia de puesta, potencial reproductivo, etc., en relación con las características del ambiente. Se toman como ejemplo las especies más importantes del punto de vista comercial, tanto de peces como invertebrados, del Océano Atlántico Sudoccidental y del Atlántico Norte, hasta el Mar Mediterráneo. Se analizan los ciclos reproductivos, estrategias energéticas y la relación entre potencial reproductivo y reclutamiento, entre otras cosas.Fil: Macchi, Gustavo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Subsede Instituto Nacional de Investigación y Desarrollo Pesquero; Argentina. Instituto Nacional de Investigaciones y Desarrollo Pesquero; ArgentinaFil: Dominguez Petit, Rosario. Consejo Superior de Investigaciones Científicas; EspañaFil: Militelli, Maria Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Subsede Instituto Nacional de Investigación y Desarrollo Pesquero; Argentina. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentin
Maturity and fecundity of Champsocephalus gunnari, Chaenocephalus aceratus and Pseudochaenichthys georgianus in South Georgia and Shag Rocks Islands
No full textThe reproductive biology of three species of icefishes (family Channicthyidae), Champsocephalus gunnari, Pseudochaenichthys georgianus and Chaenocephalus aceratus in South Georgia and Shag Rocks Islands was studied by means of a histological analysis. Parental care, a widespread behaviour among icefishes such as C. aceratus, is not observed in C. gunnari, which has a broadcast spawning strategy. There were large differences in total fecundity mainly due to the different sizes reached by each species (total fecundity range was 2,500 - 21,300 hydrated oocytes). Nevertheless, when comparing relative fecundity values, the average results were, in general, similar for P. georgianus and C. aceratus (6 - 9 hydrated oocytes per female gram). However, relative fecundity estimated for C. gunnari was 10 - 37 hydrated oocytes per ovary-free female gram. The difference may be a consequence of the smaller oocyte size of the species as compared to other icefishes. The small diameter of hydrated oocytes was also associated with low values of dry weight. The high relative fecundity recorded for C. gunnnari may compensate, in part, for a broadcast spawning strategy.Fil: Militelli, Maria Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Subsede Instituto Nacional de Investigación y Desarrollo Pesquero; ArgentinaFil: Macchi, Gustavo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Subsede Instituto Nacional de Investigación y Desarrollo Pesquero; ArgentinaFil: Rodrigues, Karina Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Subsede Instituto Nacional de Investigación y Desarrollo Pesquero; Argentin
Comparative reproductive biology of Sciaenidae family species in the Rı´o de la Plata and Buenos Aires Coastal Zone, Argentina
No full textA comparative analysis on various aspects of the reproductive biology of 7 Sciaenidae family species was done. In addition the reproductive parameters needed for stock assessment models were provided. The research covered the analysis of the duration of the breeding season and the estimation of reproductive variables such as size at maturity, fecundity and spawning frequency. When all species were considered together, some aspects of reproduction were similar, regarding the reproductive strategy; all species are batch spawners with indeterminate fecundity and an extensive reproductive season (approximately six months) except for Pogonias cromis, which showed a more limited spawning season (three months). With regard to reproductive potential, wide differences in fecundity values mainly due to the different sizes attained by each species were observed (range in batch fecundity values between 5000 and 2,800,000 hydrated oocytes). However, when relative fecundity was compared, average values were generally similar, ranging approximately between 150 and 200 hydrated oocytes per female gram. Pogonias cromis is the exception within this group, because the mean relative fecundity ranged between 75 and 98 hydrated oocytes per ovary-free female gram. This difference may be a consequence of the greater oocyte size reached by P. cromis eggs (1100 –1400 mm) compared to the rest of sciaenid analysed (750 –900).Fil: Militelli, Maria Ines. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Macchi, Gustavo Javier. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Rodrigues, Karina Andrea. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Spawning and reproductive potential of Pseudopercis semifasciata (Cuvier, 1829) (Osteichthyes: Pinguipedidae) in coastal waters off Buenos Aires Province (Argentina)
No full textPseudopercis semifasciata is a demersal teleostean fish, endemic of the southwest Atlantic Ocean, inhabiting coastal waters from 23° S to 47° S. The present study has the purpose to analyse for the first time the maturitycycle and the reproductive effort of this species from samples collected in waters off Buenos Aires Province (Argentina).The evolution of the gonadosomatic index (GSI) and the pattern of gonad development showed that spawning in P. semifasciata occurs during the austral spring and early summer, with a main peak in November. Length at first maturity, estimated only for females, was 31.77 cm TL, and age at first maturity was 2.38 years.Batch fecundity was very low, ranging between 20,647 and 152,070 hydrated oocytes, and showed significantpositive relationships with total length, total weight and age. In contrast, relative fecundity (27 hydrated oocytes/g ± 12 hydrated oocytes/g) showed an opposite pattern: it decreased with total length, total weight, age and condition. The low fecundity values estimated for P. semifasciata, together with its low growth rate, make it necessary to consider these particular traits in the adoption of management strategies for sandperch fisheries, in order to preserve local populations of this species.Fil: López, S.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Subsede Instituto Nacional de Investigación y Desarrollo Pesquero; ArgentinaFil: Macchi, Gustavo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Subsede Instituto Nacional de Investigación y Desarrollo Pesquero; ArgentinaFil: Militelli, Maria Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Marinas y Costeras; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Subsede Instituto Nacional de Investigación y Desarrollo Pesquero; Argentin
Effects of skipped spawning on the reproductive potential of argentine hake (Merluccius hubbsi)
No full textWe analyzed the effect of skipped spawning on the estimates of length and age at maturity and on the reproductive potential of Argentine hake (Merluccius hubbsi) from the Patagonian stock during the spawning peaks between 2005 and 2013. The length at first maturity increased by 2–3 cm in total length (TL), and the age at maturity increased by 0.27–0.88 years when the proportion of females that would skip spawning was incorporated in the relationships. In addition, the slopes of the models decreased, suggesting that all individuals reach sexual maturity at a greater size and age than those estimated with the traditional criterion for maturity, which does not consider skipped spawning because fish in the resting stage are classified as mature. The reduction in egg production caused by skipped spawning ranged between 3.56% and 12.12%, when we used the maturity models with age data, or between 2.70% and 6.80%, when we used the models with TL data. Females that would skip spawning were mainly specimens with sizes between 40 and 50 cm TL, and most belonged to the age class of 3-year-old fish.Fil: Macchi, Gustavo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Subsede Instituto Nacional de Investigación y Desarrollo Pesquero; ArgentinaFil: Rodrigues, Karina Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Subsede Instituto Nacional de Investigación y Desarrollo Pesquero; ArgentinaFil: Diaz, Marina Vera. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Subsede Instituto Nacional de Investigación y Desarrollo Pesquero; ArgentinaFil: Militelli, Maria Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Subsede Instituto Nacional de Investigación y Desarrollo Pesquero; Argentin
Maternal condition, fecundity and oocyte quality of Argentine hake (Merluccius hubbsi) from the Northern stock
No full textThe influence of the condition of spawning females on fecundity and oocyte quality, measured using morpho-physiological and biochemical indices, was analyzed for the Northern stock of Argentine hake (Merluccius hubbsi). First the relationships between morpho-physiological and biochemical indices were analyzed, and if they were influenced by female size. Samples of spawning-capable females were collected during the main reproductive peak of this stock in May 2011. The hepatosomatic index (HSI) in M. hubbsi was a good indicator of lipid concentration for both the liver and muscle. HSI and the relative condition factor (Kn) were independent of female size. Muscle protein content was positively associated with maternal attributes. Relative fecundity ranged between 287 and 916 hydrated oocytes g−1 and showed significant positive relationships with GSI and Kn. The dry weight of hydrated oocytes (n = 100) ranged between 2.65 and 4 mg and was positively related with the HSI. The oil droplet diameter of hydrated oocytes varied between 250 and 292 μm and was also positively related with HSI, Kn, liver and muscle lipid content, suggesting that it could be a good indicator of the nutritional condition for hake females of the Northern spawning stock.Fil: Rodrigues, Karina Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Investigaciones y Desarrollo Pesquero; ArgentinaFil: Leonarduzzi, Ezequiel. Instituto Nacional de Investigaciones y Desarrollo Pesquero; ArgentinaFil: Macchi, Gustavo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Investigaciones y Desarrollo Pesquero; ArgentinaFil: Militelli, Maria Ines. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentin
Comparative study of spawning pattern and reproductive potential of the Northern and Southern stocks of Argentine hake (Merluccius hubbsi)
No full textThe reproductive biology of the Northern (Bonaerense) and Southern (Patagonian) stocks of M hubbsi in the Argentine Sea is analyzed, including information on spawning areas, estimates of abundance and size composition of spawning females, fecundity, spawning frequency and egg quality. Samples of Argentine hake were obtained during the period of peak reproductive activity; May and January for the Northern and Southern stocks, respectively. The size of the reproductive area for the Northern stock (35- 38ºS) was clearly smaller than the one estimated for the Southern population (43º 30´-46ºS), being 23,770 Km2 and 52,460 Km2 respectively. Spawning females from the Northern reproductive area were smaller (modal values between 35 and 40 cm TL) than those from the Southern stock (modal values between 38 and 50 cm TL), and they were also less abundant in number and had a lower spawning frequency (8 - 13 days and 5 - 7 days between partial spawning for the Northern and Southern stocks respectively). No differences in batch and relative fecundity between stocks were recorded (mean values of 526 and 530 hydrated oocytes g-129 ), but the dry weights of hydrated oocytes from females of the Northern group were higher (3.08 mg for 100 hydrated oocytes) than those of the Patagonian stock (2.84 mg)for the same total length range. The egg production during the month of peak spawning of the Northern group depended mostly on the smaller females (< 50 cm TL) and was in average 1 to 2 orders of magnitude lower than that estimated for the Southern stock (9 x1012 ? 22 x 1012 eggs and 692 x 1012 ? 1,295 x 1012 eggs for the Northern and Southern stocks respectively). Those differences in egg production and the high productivity and retentive characteristics described for the spawning area and nursery ground in Patagonian waters would justify the greater abundance and resilience of the Southern stock of Argentine hake. The low abundance of females in spawning capable stage observed during the reproductive season of the Northern group (autumn-winter), led us to postulate that currently it does not exist a pronounced reproductive peak in this stock similar to the one observed for the Southern hake group during the summer.Fil: Rodrigues, Karina Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Subsede Instituto Nacional de Investigación y Desarrollo Pesquero; Argentina. Instituto Nacional de Investigaciones y Desarrollo Pesquero; ArgentinaFil: Macchi, Gustavo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Subsede Instituto Nacional de Investigación y Desarrollo Pesquero; Argentina. Instituto Nacional de Investigaciones y Desarrollo Pesquero; ArgentinaFil: Militelli, Maria Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras. Subsede Instituto Nacional de Investigación y Desarrollo Pesquero; Argentina. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentin
The Encounter between the West and the Arab World in the Age of Nahdah (Renaissance). The Translation Movement in the Arab Literary Reviews
No full textIn quest'articolo si riflette sul ruolo giocato dalla riviste letterarie arabe nella diffusione della conoscenza della cultura occidentale. Il movimento di traduzione avviato durante la Nahda (la Rinascita) in Egitto e nella Grande Siria condusse a cambiamenti sostanziali dei canoni estetici, ma suscitò anche un movimento di forte opposizione da parte dei conservatori
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