Consulta: subjectFacets:"Shells"
Registros recuperados: 11
Data/hora: 13/06/2024 05:25:41

Amelioration de la forme et de la qualite de l'huitre Crassostrea gigas Thunberg dans les claires de Marennes-Oleron.
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Zanette, Yvan; Heral, Maurice; Masse, Henri; Garnier, Jacqueline.
The breeding of Pacific oysters Crassostra gigas, in non tidal ponds, before commercialization, brings about an improvement of the shell and of the quantity and quality of the tissues. In fact, the Berthome's indice (1978) moves from 1.36 in June to 0.68 December, and the density of the shell increases in the same time from 1.79 to 1.98. On the other hand, the percentage of tissues in the oyster is 12.4% at the end of gametogenesis and more than 9% at the end of breeding. The dry tissues are composed of 10.3 of ash, 40.3% of proteins, 12.6% of lipids and 9% of carbohydrate. 95% of the carbohydrate are glycogen. The resulting energetic values are measured to 5.10 cal-mg super(-1) of dry tissues ash free.
Tipo: Text
Palavras-chave: Crassostrea gigas; Tissues; Biochemical composition; Shells; Growth; Oyster culture.
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/publication-1892.pdf

Experimental assessment of oyster transfers as a vector for macroalgal introductions
Provedor de dados: 5
Autores: Mineur, Frederic; Belsher, Thomas; Johnson, Mark P.; Maggs, Christine A.; Verlaque, Marc.
Introduction of non-indigenous species can alter marine communities and ecosystems. In shellfish farming, transfer of livestock, especially oysters, is a common practice and potentially constitutes a pathway for non-indigenous introductions. Many species of seaweeds are believed to have been accidentally introduced in association with these transfers, but there is little direct evidence.  We experimentally simulated the transfer of oysters from the Thau Lagoon (France). These transfers involved increasing periods of aerial emersion and additional brine and hot water treatments. The brine and hot water treatments were evaluated as a means of reducing the probability of algal introductions with oyster transfers. Shells were cultured for 40 days in...
Tipo: Text
Palavras-chave: Elimination treatments; Transport; Marine macrophytes; Thau Lagoon; Shells; Crassostrea gigas; Biological invasions.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2779.pdf

Evaluation des Risques dus a l'emploi des Peintures Anti-Salissures Dansales Zones Conchylicoles.
Provedor de dados: 5
Autores: Alzieu, Claude; Thibaud, Yves; Heral, Maurice; Boutier, Bernard.
The boats cruising in the oyster growing areas are protected against biofouling by paints which release toxic compounds such as copper oxide and organotins into the water. After an estimation of the inputs of copper and organotins in the "Marennes-Oleron", Arcachon (Atlantic)    and Thau (Mediterranean Sea) areas, their influence on larval fixation is discussed, taking into account the tributyltin toxicity against D larvae of Crassostrea gigas. Laboratory experiments have demonstrated that tributyltin produces morphological abnormalities of the shell and increases tin levels in tissues, interfering with copper and zinc metabolism. The influence of yacht ports on oyster growth and shell morphology, has been demonstrated in the field. The use of...
Tipo: Text
Palavras-chave: Crassostrea gigas; Oyster culture; Abnormalities; Shells; Growth; Paints; Antifouling substances; Pollution effects.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/publication-1905.pdf

Sexual selection on land snail shell ornamentation: a hypothesis that may explain shell diversity
Provedor de dados: 16
Autores: Schilthuizen, M.
Background: Many groups of land snails show great interspecific diversity in shell ornamentation, which may include spines on the shell and flanges on the aperture. Such structures have been explained as camouflage or defence, but the possibility that they might be under sexual selection has not previously been explored.   Presentation of the hypothesis: The hypothesis that is presented consists of two parts. First, that shell ornamentation is the result of sexual selection. Second, that such sexual selection has caused the divergence in shell shape in different species.   Testing the hypothesis: The first part of the hypothesis may be tested by searching for sexual dimorphism in shell ornamentation in gonochoristic snails, by searching for increased...
Tipo: Article / Letter to the editor
Palavras-chave: Mollusca; Land snails; Sexual selection; Shells; Diversity; 42.73.
Ano: 2003
URL: http://www.repository.naturalis.nl/record/224794

Characterisation of chitosan from blowfly larvae and some crustacean species from Kenyan marine waters prepared under different conditions
Provedor de dados: 20
Autores: Oduor-Odote, P.M.; Struszczyk, M.H.; Peter, M.G.
Isolation of chitosan from cuticles of blue bottlefly larvae Calliphora erythrocephala, and shells of crab Sylla cerrata, lobster Panulirus ornatus, prawn Paeneaus indicus was carried out. The yield of chitin was 12.0%, 23.0%, 15.7% and 28.0% respectively. In the same order the yield of chitosan was 66.0%, 74.6% 74.3% and 75.0% from chitin. Ash in the crab and lobster chitosan demineralised with 0.5M HCl was 30.2 and 22.4% respectively. This was reduced to 0.2 % for lobster and 0.4% for crab using 2M HCl for demineralisation and 0.5M HCL was adequate for demineralisation of prawns to bring the ash content to &lt; 1%. The ash content in the blowfly larvae was negligible. The conditions used for chitosan isolation in blowfly larvae were milder requiring no...
Tipo: Journal Contribution
Palavras-chave: MOLECULAR WEIGHT; PANULIRUS ORNATUS; CHITOSAN; PENAEUS INDICUS; SCYLLA CERRATA; Shells; Cuticles.
Ano: 2005
URL: http://hdl.handle.net/1834/1140

Observaciones sobre una población de Strombus gigas L. en la Ensenada de Nenguange, Caribe colombiano
Provedor de dados: 20
Autores: Botero, L.
Se estudia una población de Strombus gigas localizada a 12 m de profundidad en la Ensenada de Nenguange. La población ocupa un área aproximada de 98400 m². La densidad promedio más alta registrada fue de 1 caracol/14 m * y la más baja de 1 caracol/ 33 m² Estas variaciones en la densidad parecen estar relacionados con las condiciones ambientales, especialmente agitación y temperatura del agua. Los caracoles de esta población se caracterizan por una concha masiva totalmente recubierta de algas, corales, esponjas y otros organismos. El grueso labio externo es constantemente erodado por animales perforadores y reemplazado en grosor por el caracol. Se encontró una sola clase de tamaños de individuos y una casi completa ausencia de juveniles. Se registró...
Tipo: Journal Contribution
Palavras-chave: Marine molluscs; Population structure; Shells; Population structure; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 1984
URL: http://hdl.handle.net/1834/4032

Tasa de crecimiento de Anadara tuberculosa (Sowerby, 1833) (Bivalvia: Arcidae) en la reserva ecológica manglares Cayapas-Mataje (REMACAM): Un análisis basado en sistemas de cajas suspendidas
Provedor de dados: 20
Autores: Flores, L.
La tasa de crecimiento y el incremento neto de crecimiento de Anadara tuberculosa fue estudiada por medio de muestreos mensuales en sistemas de cultivo entre el 2002 y 2003 en la Comunidad El Bajito en la REMACAM. Ocho cajas suspendidas fueron utilizadas, cuatro con conchas entre los 30 y 34.9 mm y cuatro con conchas entre los 35 y 39.9 mm. No se encontraron diferencias significativas entre cada uno de los sistemas de acuerdo a cada uno de los rangos de tallas utilizados, lo que permitió establecer incrementos netos entre los 10.17 a 11.99 mm y de 8.55 a 10.68 mm, respectivamente. El periodo de mayor crecimiento de A. tuberculosa fue de octubre hasta abril. Se estimaron tasas de crecimiento mensual que variaron de 0.01 a 1.94 mm mes"-1 en el primer caso y...
Tipo: Journal Contribution
Palavras-chave: Growth rate; Shells; Experimental culture.
Ano: 2010
URL: http://hdl.handle.net/1834/4838

Grossissement des juvéniles de palourdes &lt;Ruditapes decussatus&gt; (l., 1758), sur l’estran de Zarat (golfe de Gabes, Tunisie), dans des conditions experimentales
Provedor de dados: 20
Autores: Draief, M.N.; Hitonori, N.; Zouari, H.; Guergej, Y.; Lymayem, R.
Le potentiel de grossissement de la palourde Ruditapes decussatus (L. 1758), élevée dans des poches de filet de 1 m2 de surface, a été évalué sur l’estran de Zarat (golfe de Gabès) pour la période de juillet 2006 à novembre 2007. Dans une première expérience, trois niveaux de la marée, représentant des chenaux de drainage de l’eau, existants entre la ligne de marée haute et celle de marée basse, ont été comparés sur une durée de 16 mois. Chacun des niveaux a été représenté par un triplicata de sacs de 150 individus. Dans une seconde expérience, trois densités de mise en charge différentes ont été comparées sur une durée de 17 mois. Pour cela, deux sacs de 100 individus chacun et deux autres de 200 individus chacun ont été alignés à l’expérience précédente,...
Tipo: Journal Contribution
Palavras-chave: Shells; Clam culture.
Ano: 2009
URL: http://hdl.handle.net/1834/3691

Relaciones morfométricas de la  tortuga  carey  (E. imbricata) con vista a su aplicación en el manejo
Provedor de dados: 20
Autores: Medina, Y.; Moncada, F.; Nodarse, G.
A partir de análisis morfométricos se determinó la relación existente entre los escudos dorsales con el largo recto del caparazón (LRC) para 44 ejemplares de tortuga carey (Eretmochelys imbricata), provenientes de los dos sitios de capturas tradicionales en Cuba (Nuevitas y Cocodrilo) que operaron hasta el 2008. Se tomaron dos mediciones por escudos, ancho del escudo (AE) y largo del escudo hasta la línea de imbricación (LI) para los cuatro escudos del  lado izquierdo (c1-c4) y los cinco vertebrales (v1-v5). Se encontró una relación estadísticamente significativa para todos los escudos medidos tanto en la relación (LRC-AE) como (LRC-LI), p &lt; 0,05, resultando estas moderadamente fuertes. Las correlaciones positivas entre los escudos y los largos rectos...
Tipo: Journal Contribution
Palavras-chave: Shells; Morphometric analysis; Marine turtles.
Ano: 2011
URL: http://hdl.handle.net/1834/4633

Perturbations observées chez la palourde "Ruditapes decussatus" et la datte de mer "Lithophaga lithophaga" collect"es au nord de la Tunisie
Provedor de dados: 20
Autores: Jaafar Kefi, F.; Trigui El Menif, N.; Le Pennec, M.
La présente étude a porté sur une anomalie morphologique observée chez la palourde européenne Ruditapes decussatus collectée dans le lac nord de Tunis et des perturbations coquillières relevées chez la datte de mer Lithophaga lithophaga prélevée dans la baie de Bizerte. L’examen de la partie molle et de la coquille de ces deux espèces de bivalves a révélé une malformation chez la palourde européenne  qui consiste en la différenciation de deux siphons inhalant et exhalant surnuméraires prenant naissance des deux siphons habituels, complètement séparés, inhalant et exhalant. Les siphons en forme de Y  possèdent ainsi  4 ouvertures fonctionnelles au lieu de 2.  Chez la datte de mer Lithophaga lithophaga, nous avons relevé la présence de perturbations...
Tipo: Journal Contribution
Palavras-chave: Abnormalities; Animal morphology; Ecology; Shellfish; Shells; Lithophaga lithophaga; Ruditapes decussatus; Http://aims.fao.org/aos/agrovoc/c_48059; Http://aims.fao.org/aos/agrovoc/c_48150.
Ano: 2006
URL: http://hdl.handle.net/1834/4263

OCCURRENCE OF MELOIDOGYNE JAVANICA PARASITING ROOTS AND NODULES OF PEANUTS IN PARAGUAY
Provedor de dados: 53
Autores: LORDELLO,RUBENS RODOLFO ALBUQUERQUE; LORDELLO,ANA INES LUCENA; GODOY,IGNÁCIO JOSÉ DE.
The root-knot nematode Meloidogyne javanica (Treub, 1885) Chitwood, 1949, was identified in roots, nodules and shells of peanut plants (Arachis hypogaea L.), cv. Florman-INTA, collected from a field in Menno colony, Chaco Central region of Paraguay. Infected plants were observed in patches, showing wilting and drying of vegetative parts. Peanut had been grown ininterruptly for many years in the same area and patches had already been observed in the preceding year in cv. Starr. Nematodes collected from roots in this field reproduced on tomato cultivar rutgers and peanut cultivar florunner and produced egg-masses on roots, nodules and shells of cultivar Florman. This is the first report on M. javanica parasiting peanut in Paraguay.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Root-knot nematode; Meloidogyne javanica; Peanut; Arachis hypogaea; Occurrence; Damage; Host; Nodules; Shells; Meloidogyne javanica; Arachis hypogaea.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87051997000100009