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| Registros recuperados: 48 | |
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| Roberts Jr, D. |
| Circannual, diel, and lunal periodic mechanisms in naturally reproducing stocks of tropical and subtropical fishes are reviewed. Manipulations of biological clocks, used to control reproduction in captive broodstocks, are detailed. Experiments to induce controlled maturation and spawning in fishes either test efficacy of changing environmental conditions (regimes), or constant environmental conditions (controlled). Data have been generated in experimental/scientific studies, as well as applied research. Effects of controlled environmental regimes on serum steroids, gametogenesis, spawning, fry performance and egg quality are summarized for selected members of Centropomidae, Serranidae, and Sciaenidae. |
| Tipo: Text |
Palavras-chave: Sciaenidae; Serranidae; Centropomidae; Fish culture; Controlled conditions; Sexual maturity; Photoperiods; Fish eggs; Gametogenesis; Steroids; Animal reproductive organs; Brood stocks; Marine fish; Spawning; Sexual reproduction. |
| Ano: 1989 |
URL: http://archimer.ifremer.fr/doc/1989/acte-1437.pdf |
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| Lelievre, Stephanie; Antajan, Elvire; Vaz, Sandrine. |
| One of the problems concerning studies of fish egg distribution is the weak spatial and temporal resolution due to the workload that examination of a large number of samples would demand. Recently, the development of a new laboratory imaging system, the ZooScan, capable of obtaining relatively good resolution images enables automated zooplankton identification using supervised learning algorithms. This new approach was applied to formalin-fixed fish egg samples collected during French winter IBTS (International Bottom Trawl Surveys) in the Eastern English Channel and the Southern North Sea. Fish egg spatial distributions of seven species based on the microscope and ZooScan identifications were compared. Abundance and distribution maps of winter-spawning... |
| Tipo: Text |
Palavras-chave: Fish eggs; ZooScan; Image analysis; Supervised learning method; Interpolated map. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00074/18552/16103.pdf |
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| Lelievre, Stephanie; Verrez-bagnis, Veronique; Jerome, Marc; Vaz, Sandrine. |
| A better knowledge on spawning grounds of principal commercial fishes from North Sea is necessary for their monitoring. Fish egg taxonomic identification based on morphological characters cannot always be carried out effectively. This is particularly the case for a number of Gadidae fish species eggs (i.e. cod, haddock and whiting, and three rockling species) which have the same range of size and for which molecular-based techniques can help improving the accuracy of egg taxonomic identification, and hence the reliability of studies on spawning areas. In this study, formalin fixation, egg conservation and DNA extraction were optimized in order to develop a specific PCR-RFLP method. Based on the sequence of the cytochrome b gene of reference specimens, a... |
| Tipo: Text |
Palavras-chave: Fish eggs; PCR-RFLP; Cytochrome b gene; Geostatistical analyses; Interpolated map. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00005/11613/8259.pdf |
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| Colas, Florent; Tardivel, Morgan; Perchoc, Jonathan; Lunven, Michel; Forest, Bertrand; Guyader, Gerard; Danielou, Marie-madeleine; Le Mestre, Sophie; Bourriau, Paul; Antajan, Elvire; Sourisseau, Marc; Huret, Martin; Petitgas, Pierre; Romagnan, Jean-baptiste. |
| In this paper we present the ZooCAM, a system designed to digitize and analyse on board large volume samples of preserved and living metazooplankton (i.e. multicellular zooplankton) and fish eggs > 300 µm ESD. The ZooCAM has been specifically designed to overcome the difficulties to analyse zooplankton and fish eggs in the framework of the PELGAS survey, and provide high frequency data. The ZooCAM fish eggs counts were comparable to those done with a dissecting microscope. The ZooCAM enabled the accurate prediction and fast on board validation of staged anchovy and sardine eggs in almost real time after collection. A comparison with the ZooScan, on a more complex zooplanktonic community, provided encouraging results on the agreement between the 2... |
| Tipo: Text |
Palavras-chave: ZooCAM; In-flow imaging; Fish eggs; Zooplankton; Ecosystemic survey. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00407/51833/52432.pdf |
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| Rutkowski,Thais; Schwingel,Paulo Ricardo; Brilha,Renan Todesco; Rodrigues-Ribeiro,Marcelo. |
| Arvoredo Island, located in Santa Catarina state - south Brazil, and its surrounding area were defined as a Conservation Unit (CU) in the category of Biological Reserve since 1990. This research aimed to analyze the inter-annual and seasonal (winter and summer) variations of ichthyoplankton densities at Arvoredo Biology Marine Reserve (ABMR), and their relationship with environmental variables in 1997/1998 (Campaign 1), 2007/2008 (Campaign 2) and 2008/2009 (Campaign 3). Fish eggs and larvae were sampled using a WP-2 net with 200 µm mesh size. The study area was influenced by three water masses, (i) Coastal Water throughout the whole year, (ii) Subtropical Shelf Water during the winter, and (iii) South Atlantic Central Water mainly in summer. A total of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biodiversity; Conservation Unit; Fish eggs; Fish larvae. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000400017 |
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| Villamar, F.; Ortega, D.. |
| Durante los cruceros oceanográficos realizados en septiembre, noviembre y diciembre de 1990, las especies de peces de interés comercial encontrados fueron: Sardinops sagax, Etrumeus teres, Opisthonema s.p, Scomber japonicus y Engraulis ringens; en concentraciones no mayores a 100 ejemplares/10 m2, localizados en la zona Sur del perfil costanero ecuatoriano. Entre otros huevos (H) y larvas (L) de peces, se encontraron los pertenecientes al género Leuroglossum, de la familia Bathylagidae y también ejemplares pertenecientes a la familia Myctophydae. En general, la cantidad máxima total de huevos de peces fue mayor de 10000 H/10 m2 en la longitud 82°00'W, tanto a la altura de Cabo Pasado como al sur de la Punta de Santa Elena. La cantidad máxima de larvas de... |
| Tipo: Journal Contribution |
Palavras-chave: Larval development; Fish larvae; Commercial species; Fish eggs; Fish larvae; Http://aims.fao.org/aos/agrovoc/c_2924. |
| Ano: 1991 |
URL: http://hdl.handle.net/1834/3140 |
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| Braun, M.; Reyes, H.; Pizarro, M.; Saavedra, J.; Catasti, V.; Claramunt, G.; Díaz, E.. |
| El informe contiene los resultados correspondientes al desarrollo del crucero Módulo Huevos y Módulo Adultos del proyecto FIP 200-04-1. De conformidad con la metodología planteada en la propuesta técnica y con el fin de estimar en esta primera fase algunos de los parámetros biológicos aplicables para el Método de Producción de Huevos, a saber: proporción sexual y peso promedio estimado de hembras maduras, además de la determinación de las zonas de distribución y abundancia de huevos y su asociación con las condiciones oceanográficas, se realizaron los respectivos muestreos para el recurso anchoveta, durante el período de máxima actividad reproductiva del año 2004. |
| Tipo: Report |
Palavras-chave: Fish eggs; Abundance; Geographical distribution; Sex ratio; Environmental conditions; Geographical distribution; Sex ratio; Environmental conditions; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_7014; Http://aims.fao.org/aos/agrovoc/c_32980. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/1813 |
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| Lindao, J.; Calderon, G.. |
| Entre abril y diciembre de 2008, en las estaciones fijas frente a las zonas de Esmeraldas, Punta Galera y Puerto López, se identificaron un total de 95 241 huevos de peces los mismos que pertenecieron a 10 órdenes, 31 familias, 35 géneros, 7 especies y organismos en sus primeras fases (fase mórula), de los cuales la Familia SCIAENIDAE fue la mas abundante; mientras que el número de larvas obtenidas fue 83 735; que pertenecieron a 19 órdenes, 56 familias, 83 géneros, 21 especies y organismos en estadios de prelarvas siendo la especie Bregmacero bathymaster la mas abundante durante los meses de muestreo. De los análisis cualitativos y cuantitativos, el 2008 registró menor densidad y variedad de especies ictioplanctónicas, a lo reportado en el 2006... |
| Tipo: Journal Contribution |
Palavras-chave: Ichthyoplankton surveys; Fixed stations; Fish eggs; Distribution; Density (population). |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/4788 |
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| Elías, E; Calderón, G.; Luzuriaga, G.; Chavarría, J.. |
| Entre el 04 y 13 de septiembre de 2007, se realizó el crucero T07-09-04HL, para determinar la composición de huevos y larvas de peces en la zona marine costera de la costa ecuatoriana. El área de estudio se subdividió en cuatro subáreas, dentro de las cuales se ubicaron 157 estaciones donde se realizaron arrastres verticales utilizando una red CalVET. Se registro un total de 15 940 huevos de peces.m-2, correspondientes a 11 órdenes, 19 familias, 18 géneros, 18 especies y además huevos en su primer estadio embrionario. También se identificaron 23 140 larvas.m-2, que correspondieron a 12 órdenes, 32 familias, 45 géneros, 45 especies, y organismos en estado de prelarva. La distribución de las áreas de abundancia de huevos y larvas de peces determine zonas de... |
| Tipo: Journal Contribution |
Palavras-chave: Fish eggs; Fish larvae; Species composition; Spatial distribution; Ichthyoplankton. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/4835 |
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| Braun, M.; Reyes, H.; Valenzuela, V.; Pizarro, E.; Castillo, J.; Catasti, V.; Saavedra, J.; Blanco, J.L.. |
| El presente documento, corresponde al informe final del Proyecto FIP 2003-01, presentándose los resultados de las condiciones oceanográficas físico-químicas ; la distribución geográfica y abundancia de huevos y larvas de anchoveta, sardina, jurel y caballa; y la distribución de los recursos detectados por técnicas hidroacústicas , registradas durante los cruceros estacionales de monitoreo MOBIO 0305, MOBIO 0309, MOBIO 0312 Y MOBIO 0403, realizados en otoño, invierno y primavera de 2003 y verano de 2004, respectivamente. |
| Tipo: Report |
Palavras-chave: Oceanographic surveys; Oceanographic stations; Geographical distribution; Fish eggs; Echo surveys; Geographical distribution; Http://aims.fao.org/aos/agrovoc/c_5083. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/1756 |
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| de Ciechomski, J.D.; Sánchez, R.P.; Lasta, C.A.. |
| Ichthyoplankton was sampled in 9 exploratory cruises in the sea off Buenos Aires province (Argentina), Uruguay and Brazil, during the spawning peak of the anchovy in spring-early summer and mid-autumn. The most abundant speices in the ichthyoplankton was Engraulis anchoita, representing 88. of the eggs and 76. of the larvae collected in all the cruises. These percentages vary boath regionally and seasonally; as regards eggs, the lowest percentage (10. ) was found in January. The distribution of anchovy eggs and larvae, covered almost entirely the surveyed area, with the exception of hte region influenced by the River Plate estuary. Minimum salinity tolerance for the species eggs was 23.5o/oo. The eastern limit of the distribution of anchovy eggs, extends... |
| Tipo: Journal Contribution |
Palavras-chave: Vertical distribution; Fish eggs; Spawning populations. |
| Ano: 1986 |
URL: http://hdl.handle.net/1834/2040 |
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| 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 |
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| Registros recuperados: 48 | |
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