Consulta: subjectFacets:"Algues unicellulaires"
Registros recuperados: 5
Data/hora: 01/06/2024 00:30:55

Utilisation des élevages larvaires de Crassostrea gigas en écotoxicologie marine
Provedor de dados: 5
Autores: His, Edouard; Robert, Rene.
The study of the anomalies occurring in the reproduction of Crassostrea gigas in the Arcachon Bay has been addressed through the development of some experimental protocols aimed at highlighting the action of a number of alteragenes on veligeres. The techniques used are described. They are based on the research of the action limits of the products tested on the breeding, formation and growth of oyster larvae. In addition, the sensitivity to micropollutants of the algae the veligere feed on is precised. Finally, larviculture and algae growth monitoring enabled the assessment of the quality of the sea-water and of the sediments in shellfish farming areas.
Tipo: Text
Palavras-chave: Chaetoceros calcitrans; Isochysis galbana; Algues unicellulaires; Crassostrea gigas; Larves; Bio essais; Ecotoxicologie.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-6184.PDF

Ecotron - Embiez - Utilisation d'engrais agricoles comme source de nutrilites pour la culture massive de quelques algues marines
Provedor de dados: 5
Autores: Guerin-ancey, O.; Maestrini, S.y.; Beker, L.
The use of agricultural manures for marine algae mass production. Thirteen marine algal strains belonging to different taxonomic groups have been grown in different artificial media : two culture solutions used for laboratory experiment (ANTIA and CHENG, 1970) or mass culturing (WALNE, 1970), and enriched sea waters prepared with three mixtures of purified nutrients and nine of agricultural manures Data obtained show that none of the binary or ternary manures support a good algal growth ; cell densities are generally limited to 37 % of those observed with reference medium ("Conway medium"). Mixtures prepared with agricultural nitrate and phosphate (10 N/l P) are more convenient for this purpose ; chelated-iron did not enhance algal growth. Cell densities...
Tipo: Text
Palavras-chave: Aquaculture; Algues unicellulaires; Engrais agricoles; Aquaculture; Marine algae; Agricultural manures.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00305/41667/40876.pdf

Croissance des larves de Crassostrea gigas et de Mytilus galloprovincialis en présence d'algues monocellulaires isolées du tractus digestif des véligères du milieu naturel
Provedor de dados: 5
Autores: His, Edouard; Robert, Rene.
The collection of Crassostrea gigas veligeres in their natural environment and the homogenate technique (HIS et al., 1985) enable the monospecific culture of nine algae which larvae feed on. Four of them could be mass-produced: Nannochloris atomus, Stichococcus bacillaris, Chlamidomonas bullosa and Tetraselmis Tetrathele. Their feeding quality has been tested using the cross-growth method, and using Crassostrea gigas and Mytilus galloprovincialis veligeres. Although regularly found in the homogenates, and thus fed on by larvae, the first three algae gave poor results. Only Tetraselmis tetrathele has good nutritional qualities for Crassostrea gigas veligeres.
Tipo: Text
Palavras-chave: Tetraselmis tetrathele; Chlamydomonas bullosa; Stichococcus bacillaris; Nannochloris atomus; Algues unicellulaires; Mytilus galloprovincialis; Crassostrea gigas; Nutrition; Larves.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/1986/acte-6186.PDF

Croissance et spectre de taille de trois algues en cultures non renouvelées, utilisées pour la nutrition de larves de bivalves en écloserie
Provedor de dados: 5
Autores: Robert, Rene; His, Edouard.
The different growth stages of three marine unicellular algae used in aquaculture, Isochrysis galbana, Chaetoceros calcitrans forma pumilum and tetraselmis suecica have been studied for 50 days under controlled culture conditions using a particle meter. At the same time, the size spectrum of the cells has been determined using a C 1000 scanner. The exponential growth stage is 11 days in the first two species, and 13 in the last one. Chaetoceros calcitrans forma pumilum is the smallest with an average size of 3.5 µm. Its cellular volume is constant. The average size of Isochrysis galbana is 4.5 µm. An increase of the cellular volume is observed through its stationary stage. The modal size of Tetraselmis suecica is 8 µm.  Again, an increase in the cellular...
Tipo: Text
Palavras-chave: Spectre de taille; Croissance; Tetraselmis suecica; Chaetoceros calcitrans forma pumilum; Isochrysis galbana; Algues unicellulaires.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/1986/acte-6187.PDF

Toxicité d'un désherbant, l'atrazine-simazine, sur les jeunes stades larvaires de Crassostrea gigas et sur deux algues fourrages, Isochrysis aff-galbana et Chaestoceros calcitrans
Provedor de dados: 5
Autores: Robert, Rene; His, Edouard; Maurer, Daniele.
Corn culture has strongly developed in Aquitaine (France) over the past years, and lead to an increased use of pesticides and herbicides. One of the most commonly used formulations around the coast of the Arcachon Bay, an historical oyster spat capture zone, is the Atrazine-Simazine mix. The action limits of this product are defined on Crassostrea gigas larvae and on two nanoplankton test strains used in a controlled environment for their food, Isochrysis aff-galbana and Chaetoceros calcitrans. Herbicides can indeed directly impact on oyster larvae, but they can also have a negative impact by interfering with the development of the algae used as aquaculture feed and feed for veligeres.
Tipo: Text
Palavras-chave: Chaestoceros calcitrans; Isochrysis aff galbana; Algues unicellulaires; Crassostrea gigas; LARVES; Simazine; Atrazine; Ecotoxicologie.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-6183.PDF