|
|
|
Registros recuperados: 80 | |
|
| |
|
|
Öhman, M.C.; Isidore, M.; Payet, R.J.; Robinson, J.; Marguerite, M.A.. |
Many coral reef fish species aggregate at specific times and locations for the purpose of spawning. This study examined the spatial and temporal distribution of spawning aggregations in the Seychelles. An interview-based survey of the principal stakeholders, mainly artisanal fishers, yielded 89 reports of aggregation fishing for 26 demersal and semi-pelagic fish species. Grouper aggregations were largely concentrated in the outer coralline islands of the exclusive economic zone, whilst those of snappers and rabbitfishes were mainly reported from locations on the Seychelles Bank. The spatial patterns among fish families were attributed to a combination of differences in species abundance and distribution as well as variation in fishing effort. Spawning... |
Tipo: Journal Contribution |
Palavras-chave: Coral reefs; Reef fish; Spawning. |
Ano: 2004 |
URL: http://hdl.handle.net/1834/1142 |
| |
|
| |
|
|
Bandel, K.. |
Se presentan datos con respecto a la forma de vida y del ambiente de 13 mesogastropodos superiores. Los huevos de Strombus gigas, S. pugilis, Polinices lacteus, P. hepaticus, Natica livida, N. canrena, Morum oniscus, Cypraecassis testiculus, Charonia variegata, Cymatium nicobaricum, C. pileare, Bursa cubaniana y Tonna galea se describen en detalle y se caracterizan las larvas recién nacidas. En la mayoría de las especies mencionadas se pudo determinar el tiempo de desarrollo desde el huevo hasta su nacimiento. Los huevos aquí descritos son comparados con lo que se conoce de la literatura, según sus caracteres morfológicos se distinguen seis tipos de cápsulas y masas de huevos. |
Tipo: Journal Contribution |
Palavras-chave: Marine molluscs; Spawning; Embryology; Morphogenesis; Malacology; Spawning; Embryology; Morphogenesis; Malacology; Http://aims.fao.org/aos/agrovoc/c_14490; Http://aims.fao.org/aos/agrovoc/c_10587; Http://aims.fao.org/aos/agrovoc/c_4943; Http://aims.fao.org/aos/agrovoc/c_4528. |
Ano: 1976 |
URL: http://hdl.handle.net/1834/3291 |
| |
|
| |
|
| |
|
| |
|
|
Aziz, F.K.; Zaki, M.I.; El-Absawy, M. El-G.. |
Sparus aurata females in captivity were injected with human chorionic gonadotropin hormone (HCG), pituitary extraction and both them during the spawning season. First hormonal treatment was applied as cumulative doses required for successful ovulation ranged from 4500 to 7500 IU\fish, the maximum fertilization percent was 71. The ovulation period under the influence of this treatment extended up to 14 days. In the second experiment, the total dose requirement for successful ovulation ranged from 2 to 4 pituitary extractions. Fish and the maximum fertilization percent recorded was 81, while the longest ovulation period obtained was 15 days. In the third experiment the total doses required for successful ovulation ranged from 2 pituitary extractions and 4500... |
Tipo: Journal Contribution |
Palavras-chave: Field Study; Biological fertilization; Spawning; Hatching; Larval development; Survival; Spawning; Hatching; Survival. |
Ano: 2007 |
URL: http://hdl.handle.net/1834/1908 |
| |
|
|
Giménez, E.; Moreno, V.J.; Burgos, R.; Alfonso, S.. |
La cherna americana o mero (Epinephelus mono), de la familia Serranidae, es la especie en explotación mas importante del Banco de Carnpeche, Mexico, por lo que el conocimiento de los aspectos relacionados con su reproducción, es importante para un manejo adecuado de la especie. Se determinó que la proporcion sexual (WH) vario con la talla de los ejemplares, presentando las mayores proporciones de hembras en la clase de talla de 30 cm (1:31.5). A partir de 10s 75 cm, la proporcion no fue significativamente diferente de 1:1. La talla a partir de la cual comenzó el cambio de sexo se observo entre 30 y 35 cm Lt. El contenido de la grasa mesenterial aumentó durante el otoño (septiembre, octubre, noviembre) y descendió durante el invierno (diciembre, enero,... |
Tipo: Journal Contribution |
Palavras-chave: Reproduction; Fecundity; Sex ratio; Spawning; Spawning; Reproduction; Fecundity; Sex ratio; Http://aims.fao.org/aos/agrovoc/c_14490; Http://aims.fao.org/aos/agrovoc/c_6507; Http://aims.fao.org/aos/agrovoc/c_15725; Http://aims.fao.org/aos/agrovoc/c_7014. |
Ano: 2003 |
URL: http://hdl.handle.net/1834/1804 |
| |
|
|
Bellizia, L.L.; Pan, J.; Venerus, L.A.. |
Argentine hake Merluccius hubbsi represents nowadays the main fishery resource of the Argentine Sea, in spite of the fact that the percentage of captures related to total fishery production has fallen down 30% in the last decade. The abundance and distribution of hake eggs and larvae in an intense spawning area in front of Isla Escondida (Chubut province), are analyzed. This phenomena was studied from a comparative-historical point of view allowing to apppreciate the evolution of a resource at present undergoing an overfishing pressure, capable of pushing it to collapse. Since 1973 maximum egg densities diminished and, if total egg production is considered a reliable index for recruitment prediction, no signs of overcoming stocks can be seen. On the other... |
Tipo: Theses and Dissertations |
Palavras-chave: Fish larvae; Fish eggs; Abundance; Spawning; Spawning; Fish larvae. |
Ano: 2000 |
URL: http://hdl.handle.net/1834/1477 |
| |
|
| |
|
| |
|
| |
|
|
Bernal, C.; Canales, M.; Catasti, V.; Sepúlveda, A.; Ruíz, P.; Alarcón, R.; Núñez, S.; Oyarzún, C.; Gazitúa, S.; Claramunt, G.; Herrera, G.. |
Se evalúan los stocks desovantes de anchoveta y sardina común mediante la aplicación del método de la producción diaria de huevos, durante la época de máxima actividad reproductiva del año 2003. Se diseñó un crucero de recolección de huevos y se efectuaron capturas de adultos de ambas especies entre la V (33°10’S) y X (41°20’S) Regiones. En la región costera entre la VIII y X Regiones, la condición reproductiva fue monitoreada a través de indicadores macroscópicos (IGS y estados de madurez sexual), indicando que ambas especies habrían iniciado su actividad reproductiva a partir de julio de 2003, con un máximo de actividad observado en septiembre para ambas especies. Desde la flota artesanal con puerto base en Calbuco, se obtuvieron hembras de sardina común... |
Tipo: Report |
Palavras-chave: Stock assessment; Clupeoid fisheries; Fish eggs; Biomass; Spawning; Spawning populations; Stock assessment; Biomass; Spawning; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_14490. |
Ano: 2004 |
URL: http://hdl.handle.net/1834/1695 |
| |
|
|
Vaïtilingon, D.; Rasolofonirina, R.; Eeckhaut, I.; Jangoux, M.. |
The reproductive cycle and gonad morphology were investigated in a population of Holothuria scabra (Jaëger, 1833) from Toliara, south-west of Madagascar. Surveys were done from November 1998 to April 2001 by monthly samplings of 30 individuals. There is a single gonad formed by a tuft of numerous ramified tubules. The annual reproductive cycle of the population was determined from monthly variations of the gonad index and the maturity index. Five sexual maturity stages were described. An annual reproductive cycle occurred with most individuals being mature or spawning between November and April. Gametogenesis was not synchronous in the population, but was synchronous in all the tubules of a single gonad except the smallest immature ones (length < 1 cm).... |
Tipo: Journal Contribution |
Palavras-chave: Reproductive cycle; Spawning. |
Ano: 2005 |
URL: http://hdl.handle.net/1834/1134 |
| |
|
|
Kreiner, Anja; Yemane, Dawit; Stenevik, Erling K.; Moroff, Nadine E.. |
Most reports on the distribution of spawning areas of sardine (Sardinops sagax) in the northern Benguela originate from the 1970s and 1980s. The northern Benguela system was in a high upwelling regime during those decades. Since the early 1990s upwelling favourable winds have decreased and a trend of increasing sea surface temperature (SST) has been observed. Changes in the structure of sardine stock in the northern Benguela have been observed and it has been suggested that a reduced biomass and changes in stock structure has led to decreased spawning in the favourable southern locations, thus preventing a recovery of the sardine stock. The present paper on the contrary shows that there has been a shift in spawning location from the less favourable... |
Tipo: Journal Contribution |
Palavras-chave: Coastal upwelling; Upwelling system; Temperature; Spawning; Seasonal changes. |
Ano: 2011 |
URL: http://hdl.handle.net/1834/4625 |
| |
|
| |
|
|
Missaoui, H.; Toujani, R.; Romdhane, M.S.. |
Durant la période mars 1996 - mars 1997, nous avons suivi sur un échantillon de 720 individus, l’état de la maturité sexuelle des femelles de sandre Stizostedion lucioperca peuplant la retenue du barrage de Sidi Salem (nord de la Tunisie). Parallèlement, une étude basée sur des coupes histologiques a été réalisée sur un échantillon de 65 femelles (taille moyenne = 35 cm, poids moyen = 522 g et âge moyen = 1,8 ans). Ces travaux ont permis de montrer que: - l’âge de la première maturité sexuelle des femelles est d'un an pour une taille de 24 cm et un poids de 90 g. - la fécondité relative est de 200 œufs / g de poids corporel et la fécondité absolue F est fortement corrélée avec le poids W (F=632 *W 0,77), la taille L (F=6760*L 148372) et l'âge t... |
Tipo: Journal Contribution |
Palavras-chave: Spawning; Fecundity; Freshwater fish; Oogenesis; Sexual maturity. |
Ano: 2010 |
URL: http://hdl.handle.net/1834/4288 |
| |
|
|
Leonarduzzi, E.; Di Marco, E.J.; Pájaro, M.. |
The daily spawning females fraction (S) of Argentine anchovy (Engraulis anchoita) in relation to the year, length, proportion of females, temperature and salinity variables was studied using generalized linear models. Samples were collected during eleven research surveys carried out in the main spawning seasons and areas during 1993-2008 (Southwest Atlantic Ocean, Argentine Sea). The aim of this work was to identify the factors that affect the spawning activity. No temporary differences were observed and an S 0.12 average value was estimated. The poor explanatory percentage of the models analyzed did not allow to clearly detect the variables that could affect S. Length and temperature were the only variables that related positively, which suggests that... |
Tipo: Journal Contribution |
Palavras-chave: Pelagic fish; Reproduction; Biomass; Spawning; Mathematical models. |
Ano: 2013 |
URL: http://hdl.handle.net/1834/5492 |
| |
|
| |
Registros recuperados: 80 | |
|
|
|