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| Registros recuperados: 94 | |
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| Beiras, R; His, Edouard. |
| The effects of Hg concentrations ranging from 0 (control) to 1024 mu g l(-1) upon embryogenesis, survival and growth of Mytilus galloprovincialis mussel larvae were investigated. Embryogenesis was abnormal in 50% of the individuals at 10 mu g l(-1). The 48 h LC(50) for D-shaped, early umbonate, late umbonate and eyed larvae were 51, 164, 322 and 383 pg l(-1) respectively. The LC(50) was an allometric function of ash-free dry weight with exponent b = 0.60. Larval growth was significantly reduced after 6 d exposure to 4 mu g Hg l(-1) and after 10 d exposure to 2 mu g l(-1). No significant differences in lethal or sublethal sensitivity to Hg were found between M. galloprovincialis and previously studied Crassostrea gigas embryos and larvae. The implications... |
| Tipo: Text |
Palavras-chave: Mercury; Mytilus; Mussel; Larva; Growth; Embryo; Bioassay; Ecotoxicology. |
| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00258/36946/35665.pdf |
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| Gatesoupe, Fj. |
| The proportion of vibrio E, dominant in healthy turbot larvae, was artificially increased in the rotifer enrichment medium. The maid effect of this vibrio enrichment was to improve the resistance of larval turbot challenged with a pathogenic strain of Vibrio splendidus, vibrio P. The improvement of the survival rates was significant with 1.5 x 10(6) CFU of vibrio E added per mi of enrichment medium, and it was still maximum at the hi hest dose tested (5 x 10(7) CFU.ml(-1); 80 +/- 2% of survivors after 48 h of challenge, versus 50 +/- 2 % for the control group). Further in vitro characterisation showed that vibrio E was able to grow in the presence of the chelating agents EDDHA and EDTA, while producing siderophore, as revealed by chrome azurol S dyeing.... |
| Tipo: Text |
Palavras-chave: Bacteria; Pathogenic Vibrio; Probiotic Vibrio; Experimental infection; Siderophore; Turbot; Larva. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00065/17671/15199.pdf |
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| LEITE,Rosseval Galdino; ARAUJO-LIMA,Carlos A. R. M.. |
| Mylossoma aureum e M. duriventre são duas espécies abundantes na várzea do rio Solimões/Amazonas, entretanto, pouco se conhece sobre a ecologia de suas larvas. Aqui, são descritas as dietas de larvas de 4,5 a 16 mm de comprimento padrão, no rio e em cinco lagos de várzea. As capturas foram feitas com rede de ictioplâncton e rede de mão nos principais mesohabitats do rio e da sua planície de inundação. A contribuição relativa dos alimentos foi analisada pelos seus pesos secos no conteúdo estomacal. Os mesohabitats e o comprimento das larvas foram considerados na avaliação da dieta. Verificou-se que as duas espécies alimentaram-se com maior intensidade nas áreas inundadas, principalmente nos capins aquáticos, e raramente no canal do rio. Os alimentos que... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Peixe; Alimentação; Larva; Amazônia; Zooplâncton. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672000000100129 |
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| Cerqueira,Vinicius Ronzani; Brügger,André Macedo. |
| Different light intensities were tested during the larval rearing of fat snook (Centropomus parallelus) to evaluate its influence on survival and functional swim bladder rate. Newly-hatched larvae were obtained by stripping of hormonally induced broodstock, and were stocked in 32-liter tanks at densities from 30 to 50 L-1. Four experiments were carried out testing six light intensities: 50, 100, 200, 500, 1500, and 2500 lx, and total darkness as a control. Mean survival ranged from 0.06 to 16.0% and were significantly influenced by light intensity. Complete darkness resulted in 100% mortality after one week, larvae appeared to have starved since they had empty stomachs. The species has the characteristics of a visual-feeder. Survival was the highest at 200... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fat snook; Larva; Centropomus parallelus; Light intensity; First-feeding. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000400004 |
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| Uliana,Oclecio; Silva,José Henrique Souza da; Radünz Neto,João. |
| O presente trabalho foi desenvolvido para avaliar a influência de diferentes fontes de lipídios sobre o desempenho de larvas de jundiá (Rhamdia quelen). Foi realizado no Setor de Piscicultura do Departamento de Zootecnia da Universidade Federal de Santa Maria, utilizando-se um sistema de criação de larvas com recirculação d'água, termorregulada. O experimento teve duração de 21 dias, testando-se 7 tratamentos com três repetições. Testaram-se diferentes fontes de lipídios: óleo de canola, óleo de soja, óleo de fígado de bacalhau, óleo de girassol e óleo de milho, incorporados na proporção de 5% de uma dieta base (fígado e levedura). O tratamento com óleo de canola resultou em 94% de sobrevivência e larvas com 19,97mm de comprimento total e 54,3mg de peso... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lipídios; Fígado; Larva; Levedura; Sobrevivência; Rhamdia quelen. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782001000100021 |
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| Joly, Jean-pierre; Bouget, Jean-francois; Hirata, Toshio. |
| L’implantation récente de Rapana venosa, gastéropode prédateur originaire d’Extrême Orient, en plusieurs points du globe (USA, France, Uruguay, Argentine) et son impact sur les populations de bivalves autochtones justifient un certains nombre de recherches engagées par les pays concernés. Le présent rapport compile les dernières informations scientifiques disponibles sur la biologie de R. venosa. Par ailleurs, l’opportunité d’obtenir des pontes en milieu naturel et en captivité en 2001 a permis de faire des observations sur la maturation des larves. Il apparaît que dans les conditions de températures régnant en Baie de Quiberon en été (18 à 22°C), les larves de Rapana venosa sont capables d’éclore. L’impossibilité, dans cette expérimentation, d’amener ces... |
| Tipo: Text |
Palavras-chave: Rapana venosa; Biologie; Larve; Eclosion; Rapana venosa; Biology; Larva; Hatching. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/00016/12699/9620.pdf |
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| Damen, Peter; Dictus, Wim J.A.G.. |
| The development of the muscular system of the gastropod mollusc Patella has been thoroughly studied. As a result, two larval retractors, the main and accessory larval retractor, had been described in the larva of Patella. These muscles were supposed to be responsible for the retraction of the larval body into the shell. Previously no larval extensors, which would be responsible for the extension of the larval body out of the shell, have been described. Using cell-lineage tracer injection and phalloidin staining of muscles, a newly-discovered muscle is herein identified in the larva of Patella coerulea. A functional model is presented in which two muscles are responsible for the extension of the larva, the newly-discovered muscle together with the... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Patella; Gastropoda; Mollusca; Development; Larva; Muscle; Antagonist; Cell-lineage. |
| Ano: 2002 |
URL: http://www.repository.naturalis.nl/record/534309 |
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| Registros recuperados: 94 | |
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