scholarly journals Effect of estradiol-17β on the sex ratio, growth and survival of juvenile common snook (Centropomus undecimalis)

2014 ◽  
Vol 36 (3) ◽  
pp. 239 ◽  
Author(s):  
Cristina Vaz Avelar de Carvalho ◽  
Gabriel Passini ◽  
Wanessa De Melo Costa ◽  
Beatriz Nunes Vieira ◽  
Vinicius Ronzani Cerqueira
Keyword(s):  
Sex Ratio ◽  
Growth And Survival ◽  
Centropomus Undecimalis ◽  
Common Snook ◽  
Estradiol 17Β

Advances in Fish Tagging and Marking Technology

2012 ◽  
Keyword(s):  
Experimental Design ◽  
Habitat Use ◽  
New Technologies ◽  
Sciaenops Ocellatus ◽  
Growth And Survival ◽  
Fish Stocks ◽  
Centropomus Undecimalis ◽  
Common Snook ◽  
Oriented Approach ◽  
Tagging Methods

<i>Abstract</i>.—In designing research programs, scientists may constrain development of sequential hypotheses because of perceptions about logistical constraints to using new technologies in monitoring or experimental design. Using trusted, familiar methods can supersede asking which hypotheses would have the greatest impact and what method(s) are required to test them. To help maintain a ‘problem-oriented’ approach, rather than a ‘methods oriented’ one, we could strive to remain aware of new innovations and applications in research; this is particularly so for tagging technology, when new methods emerge. Research enabled by recent innovations can be incorporated through collaborations with other scientists or by working directly with vendors to implement and refine new tag technologies and applications. Some tagging studies can be improved by using multiple marking methods (e.g. see recent applications of various tag technologies with common snook <i>Centropomus undecimalis </i>and red drum <i>Sciaenops ocellatus </i>in Florida to evaluate recruitment, mortality, and habitat use of different life stages; Adams et al. 2006; Bennett 2006; Marcinkiewicz, 2007; Brennan et al. 2008; Tringali et al. 2008). Here we consider a few case studies that have implemented a variety of tagging methods to explore poorly understood factors that mediate growth and survival and the effectiveness of hatchery releases to help replenish depleted marine fish stocks.

scholarly journals Feminización de juveniles del Robalo Blanco Centropomus Undecimalis (Bloch 1792) usando 17β-Estradiol

2012 ◽  
Vol 3 ◽  
pp. 83 ◽  
Author(s):  
Juan Manuel Vidal-López ◽  
Carlos Alfonso Álvarez-González ◽  
Wilfrido Miguel Contreras-Sánchez ◽  
Reynaldo Patiño ◽  
Arlette Amalia Hernández-Franyutti ◽  
...  
Keyword(s):  
United States ◽  
Experimental Study ◽  
Control Diet ◽  
The United States ◽  
Control Group ◽  
Growth And Survival ◽  
Centropomus Undecimalis ◽  
Common Snook ◽  
17Β Estradiol ◽  
Time Periods

El robalo blanco Centropomus undecimalis es un pez protándrico hermafrodita con un alto valor comercial y potencial de cultivo en México y Estados Unidos de América, y en Centroamérica y el Caribe es sustento importante de su pesca artesanal. Diversos estudios indican que las hembras aparentemente presentan un mayor crecimiento que los machos. El objetivo del presente estudio consistió en evaluar el efecto de la suplementación del esteroide 17-β estradiol (E2) en el alimento sobre la proporción de sexos de esta especie bajo condiciones de laboratorio. Para ello se realizó un estudio donde se evaluaron seis tratamientos (tiempos de exposición) con 17-β estradiol (7, 14, 21, 28, 35 y 42 días) usando alimento impregnado con 50 mg kg-1 de 17-β estradiol y una dieta control sin esteroide.Después de los días de exposición, los peces fueron mantenidos con dieta sin 17-β estradiol hasta completar 204 días de crianza, determinándose la proporción de sexos, crecimiento y supervivencia. Al final del período de crianza, los peces alimentados con dieta enriquecida con 17-β estradiol por 21 y hasta 42 días muestran la mayor proporción de hembras (93%), mientras que el grupo control presentó el 100% de machos. El mayor crecimiento en longitud y peso se obtuvo en los peces alimentados por 21 días con el E2 (193.11 ± 1.83 mm y 28.56 ± 0.63 g) comparado con el resto. La supervivencia no mostró diferencias significativas entre los tratamientos (92% a 98%). Se concluye que es posible obtener altos porcentajes de feminización utilizando 17-β estradiol al alimentar a los peces por al menos 21 días. Abstract Common snook Centropomus undecimalis is a protandric fish with a high commercial importance and aquacultural potential in Mexico and the United States. Several studies indicate that females have higher growth capacity than males. For this reason, the objective of this research was to evaluate the effect of a 17β-estradiol (E2) diet supplementation on sex proportion for this species. In this sense, an experimental study was conducted where fish were fed for different time periods (7, 14, 21, 28, 35, and 42 days) with food impregnated with 50 mg of E2/Kg, and one control diet without the presence of the steroid. After feeding times, fish were raised for additional 204 days with the control diet to evaluate sex proportion, growth and survival. Our results showed that fish fed with E2 for 21 days or more had the highest female sex proportion (93-100%), while the control group showed the highest male proportion (100%). The highest growth (weight and total length) was detected in fish fed with E2 for 21 days (193.11 ± 1.83 mm and 28.56 ± 0.63 g) compared with the rest of the treatments. Survival did not show statistical differences between treatments (92-98%). We conclude that high percentage of C. undecimalis females can be obtained when fish are fed for 21 days or more with artificial food supplemented with E2.

scholarly journals Feeding rate and feeding frequency affect growth performance of common snook (Centropomus undecimalis) juveniles reared in the laboratory

2019 ◽  
Vol 48 ◽  
Author(s):  
Ricardo Luís Mendes de Oliveira ◽  
Leilane Bruna Gomes dos Santos ◽  
Nelson Gomes da Silva Neto ◽  
Scarlatt Paloma Alves da Silva ◽  
Felipe dos Santos Silva ◽  
...  
Keyword(s):  
Growth Performance ◽  
Feeding Rate ◽  
Feeding Frequency ◽  
Centropomus Undecimalis ◽  
Common Snook

Effects of stocking density on cannibalism in juvenile common snook Centropomus undecimalis

2019 ◽  
Vol 51 (2) ◽  
pp. 844-847
Author(s):  
Ron Hans ◽  
Ryan Schloesser ◽  
Nathan Brennan ◽  
Flavio Ribeiro ◽  
Kevan L. Main
Keyword(s):  
Stocking Density ◽  
Centropomus Undecimalis ◽  
Common Snook

Transport and cryopreservation of sperm of the common snook, Centropomus undecimalis (Bloch)

2004 ◽  
Vol 35 (3) ◽  
pp. 278-288 ◽  
Author(s):  
T R Tiersch ◽  
W R Wayman ◽  
D P Skapura ◽  
C L Neidig ◽  
H J Grier
Keyword(s):  
Centropomus Undecimalis ◽  
Common Snook ◽  
The Common

The influence of sibling gender on the growth and survival of Great-tailed Grackle nestlings

1990 ◽  
Vol 68 (9) ◽  
pp. 1925-1930 ◽  
Author(s):  
Kevin L. Teather
Keyword(s):  
Sex Ratio ◽  
Growth Rates ◽  
Egg Mass ◽  
Hatching Date ◽  
Growth And Survival ◽  
Nestling Growth ◽  
Males And Females ◽  
Predominantly Female ◽  
Sibling Gender

Growth and survival of Great-tailed Grackle (Quiscalus mexicanus) nestlings were monitored over 3 years to determine if greater food demands of sons influenced nestling success. I predicted that (i) the growth rates of nestlings would be lower in nests containing mostly males, and (ii) the chance of all nestlings in predominantly male broods fledging would be less than that in predominantly female broods. Sibling gender and the overall sex ratio of the brood had little effect on nestling growth. There was no evidence that starvation was more frequent if the oldest nestlings were males rather than females, although there was some evidence that broods of three containing two or three males were less likely to fledge all nestlings than those containing two or three females. Mass at fledging for both males and females was influenced most strongly by hatching sequence and to a lesser extent by egg mass and hatching date.

Sign in / Sign up

Export Citation Format

Share Document