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Copyright of Ecosistemas y Recursos Agropecuarios is the property of Universidad Juarez Autonoma de Tabasco and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista de Biologia Marina y Oceanografía (RBMO) is the property of Universidad de Valparaiso, Facultad de Ciencias del Mar and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Turbinella angulata y Busycon perversum aportan la mayor captura de caracol en el Golfo de México (90%).Se realizaron muestreos mediante transectos lineales (150x1.5m) de abril 2008 a marzo 2010 y en las capturas comerciales del Banco de Campeche (18°-20º N - 90°- 91º O). 2 832 individuos de T. angulata fueron medidos, las tallas variaron entre 63-282mm (LS), la proporción hembras:machos fue 0.98:1. Los valores de crecimiento fueron: L=346mm, K=0.30 y t0=-0.24. El periodo reproductivo fue de enero a mayo con reposo de junio a septiembre (80%). La talla de primera madurez (L) fue de 210mm (LS) en hembras y 200mm en machos. De B. perversum,1 655 ejemplares fueron analizados con tallas entre 78-292mm, presentando diferencias significativas entre longitudes de machos y hembras (p0.05). La proporción hembras:machos fue 1:0.25. Los valores de crecimiento fueron L=360 mm, K=0.35 y t=-0.19. El periodo reproductivo fue de agosto a diciembre con reposo de enero a abril. La L50 fue de 215mm (LS) en hembras y 190mm en machos. Se observó un pulso de reclutamiento anual en ambas especies relacionado con el incremento en la temperatura marina. Los resultados ayudarán a definir un esquema de manejo basado en los atributos poblacionales y reproductivos de las especies.Turbinella angulata and Busycon perversum are two marine gastropods that support the 90% of conch fisheries in the Gulf of Mexico, nevertheless there is no information available to support a management strategy for both species. The aim of this work was to obtain preliminary fishery information to promote management actions for both species in the Campeche Bank. The population of conchs was sampled in 12 transects (150x1.5m) by SCUBA diving from April 2008 to March 2010. All conchs were collected and siphonal length (SL) was measured. These samples were complemented with data from the commercial catches, analyzing a total of 2 832 individuals of T. angulata. Siphonal length varied between 63 and 282mm. Sex ratio was of 0.98:1 female:male. The von Bertalanffy growth equation parameters were: L=346mm; K=0.30 and t=-0.24. Spawning extended from January to May with a long resting stage from June to September for over 80% of the adult population. The first gonadic maturity (L) was at 210mm (SL) for females and 200mm for males. For B. perversum a total of 1 655 individuals were analyzed. Siphonal length varied between 78 and 291mm with significant differences between male and female (p0.05). Sex ratio was of 1:0.25 female:male. The growth parameters obtained were: L=360mm; K=0.35 and t=-0.19. The spawning period was from August to December with resting stage from January to April. The L was 215mm (LS) for females and 190mm for males. Both species presented one recruitment pulse. These results will be useful to design management schemes based on population dynamics and reproductive attributes.

The reproductive biology of Patagonian flounder (Paralichthys patagonicus) was studied in the Bonaerense Coastal Zone (34°-42°S) using samples collected in December 2003 and 2005. According to the literature, the data were analyzed considering two population groups: one in the northern zone (34°-38°S) and another in El Rincón (38°-42°S). The estimated 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 Rincón. In 2005, the L50 was only estimated for the northern zone, and the value obtained was less than that of 2003 (27.82 cm TL). In December 2003, the greatest reproductive activity took place in El Rincón. However, in December 2005, the highest proportions of hydrated fe-males were observed in the northern area. This could be due to the cooler temperatures recorded for this zone, as compared with 2003. Batch fecundity showed a potential fit to size and a lineal fit to 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 of 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 the high temperatures observed in 2005.Se estudió la biología reproductiva del lenguado (Paralichthys patagonicus) en la Zona Costera Bonaerense (34°-42°S). 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 (34-38°S) y otro en El Rincón (38-42°S). 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 (30 cm. 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.

The reproductive biology of Patagonian flounder (Paralichthys patagonicus) was studied in the Bonaerense Coastal Zone (34º-42ºS) using samples collected in December 2003 and 2005. According to the literature, the data were analyzed considering two population groups: one in the northern zone (34º-38ºS) and another in El Rincón (38º-42ºS). The estimated 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 Rincón. In 2005, the L50 was only estimated for the northern zone, and the value obtained was less than that of 2003 (27.82 cm TL). In December 2003, the greatest reproductive activity took place in El Rincón. However, in December 2005, the highest proportions of hydrated females were observed in the northern area. This could be due to the cooler temperatures recorded for this zone, as compared with 2003. Batch fecundity showed a potential fit to size and a lineal fit to 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 of 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 the high temperatures observed in 2005. [ABSTRACT FROM AUTHOR]

Administration of fishing resources requires of basic biological information in order to maintain fishing production throughout the time. For this reason, this research was conducted aimed at providing knowledge on reproductive aspects of the Peruvian silverside Odontesthes regia regia that may serve to improve fishing management. 1590 ovaries were processed and analyzed histologically. The results were used in the reproductive cycle description and in the first gonadal maturity and fecundity estimation. The average length and first maturity length were estimated in 15 and 14 cm respectively. Batch fecundity was considered in 1 174 oocytes per batch and relative fecundity in 56 oocytes per gram of weight for the periods of greater reproductive activity (in 1996 and 2003). [ABSTRACT FROM AUTHOR]