Manioc : Portail | resultats 1 - 20 pour la recherche: Floats

Complete story of the Martinique and St. Vincent horrors
Auteur(s) : Garesche, William A. (1852-1905)
Auteurs secondaires : Demessimy, Vincent (18..-1)
Année de publication :

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Narrative of a five years' expedition against the revolted negroes of Surinam in Guiana, on the wild coast of South America from the year 1772 to 1777, elucidating the history of that country and describing its productions... with an account of the Indians of Guiana and negroes of Guinea... Tome 2
Auteur(s) : Stedman, John Gabriel (1744-1797)
Année de publication :

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A boat near a floating seaplane off the coast of North Cat Cay ; The Bryant Slides Collection ; The Bryant Slides Collection, Bahamas
Auteur(s) : Unknown ( Photographer )

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Enquête parlementaire sur les emprunts du gouvernement Domingue à l'etranger (parl. investigation into floating of massive governemnt loan, composite title)

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A man walks on a beach near Winding Bay, Great Abaco, Bahamas ; The Bryant Slides Collection ; The Bryant Slides Collection, Bahamas
Auteur(s) : Unknown ( Photographer )

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Vendors selling coconut water to tourists on raft ride down the Rio Grande River in Port Antonio, Portland, Jamaica ; The Bryant Slides Collection ; The Bryant Slides Collection, Jamaica
Auteur(s) : Unknown ( Photographer )

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The West Tampa Business Association in a 1928 parade.
Auteur(s) : Burgert Brothers, 1917- ( Photographer )
Auteurs secondaires : Tony Pizzo Collection

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Evaluation of floating cages as an experimental tool for marine shrimp culture studies under practical earthen pond conditions
Auteur(s) : Chim, Liet Castex, Mathieu Pham, Dominique Brun, Pierre Lemaire, Pierrette Wabete, Nelly Schmidely, P Mariojouls, C

Éditeur(s) : Elsevier
Résumé : The New Caledonia blue shrimp Litopenaeus stylirostris is commercially produced under semi-intensive rearing conditions. The size of the farming earthen ponds (510 ha) and the subsequent production constraints make it difficult to use them as experimental units for random experiments. Moreover, since every pond has its own characteristics, ponds' effects cannot be ruled out, thus making it hard to define true replicates. In order to design future experiments under conditions resembling those used in production, we evaluated the possible use of floating cages as experimental units with the aim of assessing treatment effects with a reasonable statistical power. To this end, two sets of floating cages were placed respectively in two different ponds in a commercial farm. In both cases the zootechnical conditions in the cages were similar in post-larvae origin, management, and diet and feeding regime. The aim of the study was to evaluate on a technical basis the possibility of rearing shrimps in floating cages set up in earthen ponds and to assess this method from a statistical standpoint. Shrimps reared in and outside the cages showed comparable growth and survival rates. The variability in the zootechnical parameters between cages, expressed as the estimated coefficient of variation (CV) for survival rate, total final biomass (g), final body weight (g), daily increment in body weight (g day− 1) and FCR were 11.0, 13.7, 4.4, 5.4, and 7.0%, respectively. On the basis of these figures, we calculated for a given statistical power (80%) the number of replicates (cages) that would be required to reveal significant differences between two treatments, at a 5% level of significance. We found that for expected differences of 20% from the control mean, 3 and 6 floating cages per treatment would be reasonable to determine statistical differences for growth parameters and survival rate, respectively. Moreover, we showed a significant pond effect in regard to survival and growth between the two sets of cages. These results illustrated the within-farm variability among the ponds, and confirmed that the specific characteristics of each pond from the same farm make it difficult to use the ponds themselves as experimental units. The study demonstrates that rearing in floating cages is an economical, powerful and sensitive experimental tool for shrimp culture studies specifically carried out under conditions close to semi-intensive production.
Aquaculture (0044-8486) (Elsevier), 2008-07 , Vol. 279 , N. 1-4 , P. 63-69

Droits : 2008 Elsevier B.V. All rights reserved.
http://archimer.ifremer.fr/doc/2008/publication-4363.pdf
DOI:10.1016/j.aquaculture.2008.03.053
http://archimer.ifremer.fr/doc/00000/4363/

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