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| Registros recuperados: 10 | |
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| Bertrand, Jacques; Chevalier, Robert. |
| One of the primary uses of trawl survey data is the estimation of abundance of the species involved. But these direct estimates give results with generally a high variability. Reducing this latter is one of the main problems for the scientists involved in such a research. Methods to achieve a better efficiency have been implemented. Nevertheless estimations remain highly variable, so the information on the changes in population, enclosed in the observed series of survey indices is mixed with a noise component result of both the survey sampling variability and effect of uncontrolled factors. PENNING'roN ( 1985) proposed time series models to filter measurement error from the signal. However the length of the series does not always allow using time series... |
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| Ano: 1988 |
URL: http://archimer.ifremer.fr/doc/00388/49925/50499.pdf |
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| Chevalier, Robert; Pairain, Robert. |
| Les résultats relatifs à la toxicité des produits chimiques sont quelquefois difficilement comparables tant à cause de la diversité des techniques utilisées que de l'hétérogénéité du matériel biologique et des modalités d'exposition (19). Le désir des délégués de Zurich était de pallier ces inconvénients en définissant des conditions expérimentales rigoureuses. Mais le respect de ces normes exige une attention soutenue et "chaque détermination d'un point du graphique de toxicité représente une somme de travail importante" (18). La mesure de la tolérance limite médiane suggérée par DOUDOROFF, permettant des expériences de plus longue durée et une surveillance plus relachée, a servi de schéma à beaucoup de travaux aux Etats-Unis et en Europe. BEAK (6)... |
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| Ano: 1968 |
URL: http://archimer.ifremer.fr/doc/1968/publication-7277.pdf |
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| Pelletier, Dominique; Beucher, Helene; Chevalier, Robert; Laurec, Alain; Alperi, J.; Pereda, P.; Guichet, Roger; Dupouy, Herve; Peronnet, Isabelle. |
| The aim of the project "rationalization of biological sampling for stock assessment of marine fisheries in the bay of Biscay" is to perform statistical methods and computer programs allowing to test prognoses and diagnoses based on estimates of fishing mortalities, recruitments, yields per recruit, and the "gain-loss" function. The project gathers the laboratories of the community working on the Bay of Biscay fisheries, namely - Santander in Spain (1. E. 0) - La Rochelle and Lorient in France (IFREMER). A descriptive study has been carried out. The prepared documents contain a description of the procedures used to collect the information, by each of the laboratories involved, on: - landings - biological samplings. More comprehensive data have been gathered... |
| Tipo: Text |
Palavras-chave: Capture; Marine biology; Fisheries; Megrim; Monk; Hake; Data collection; TAC; Bay of Biscay; Stock assessement; Sampling; Statistics; Capture; Biologie marine; Halieutique; Cardine; Baudroie; Merlu; Collecte de données; TAC; Golfe de Gascogne; Evaluation des stocks; Echantillonnage; Statistiques. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/1991/rapport-3621.pdf |
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| Registros recuperados: 10 | |
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