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Deslous-paoli, Jean-marc / Heral, Maurice / Berthome, Jean-paul / Razet, Daniel / Garnier, Jacqueline - 1981In summer 1979, the natural reproduction of oysters Crassostrea gigas Thunberg, in Marennes-Oleron basin, produced a large number of juveniles which was not the case in summer 1981. If one compares the evolution of the main constituents of the flesh, one can see that, at the beginning of August,...Contributeur (s):
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Heral, Maurice / Deslous-paoli, Jean-marc / Prou, Jean - 1986The evolution of the production of cupped oysters is estimated on a century (1885-1985) with three different sources of data. The total biomass in culture is calculated from productions by knowing regularly the growing rate and the mortality rate of the populations of oysters. It appears that the...Contributeur (s):
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Deslous-paoli, Jean-marc / Jousset, Jacques - 1987Que ce soit dans les études de digestion des mollusques effectuées dans le milieu natural ou en laboratoire, ou pour mesurer l'impact des élevages de mollusques sur les sols sous-jacents, l'étude des biodépôts des mollusques se généralise. Cependant, les temps de séjour dans l'eau...Contributeur (s):
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Heral, Maurice / Zanette, Yvan / Deslous-paoli, Jean-marc / Robert, Jean-michel / Razet, Daniel - 1981In 1979 and 1980, the characteristics of the particulate organic matter are defined fortnightly through seston analyses. It is very high in the basin and very low in the finishing ponds. The phytoplanktonic biomasses are maximal in May in the estuary, and in June-July in the finishing ponds, with...Contributeur (s):
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Heral, Maurice / Deslous-paoli, Jean-marc / Garnier, Jacqueline / Prioul, Daniel / Heurtebise, Serge / Razet, Daniel - 1982Different types of pregrowth of the Japanese palourde are compared on the some site. The method by upwelling which is the more common used, to have good growth, requires a compromise between the running and the raised biomass. Two periods are critical, in the summer the growth of mollusks is...Contributeur (s):
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Deslous-paoli, Jean-marc / Zanette, Yvan / Heral, Maurice / Masse, Henri / Garnier, Jacqueline - 1981The 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...Contributeur (s):
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Deslous-paoli, Jean-marc - 1985The reproduction of Crepidula fornicata occurs from the end of February to October. This reproduction determines two periods of juvenile settlement, the first early in June and the second early in October. Because of the lack of distinct cohorts, estimation of production and population dynamics...Contributeur (s):
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Heral, Maurice / Bacher, Cedric / Deslous-paoli, Jean-marc - 1989Maurice Héral has been studying, since 1976 at the IFREMER Station of La Tremblade (France), the trophic networks of shellfish-farming ecosystems and, especially, the variability of available food, energy assessment, the ecophysiology of the Japanese oyster; he has set up a comprehensive model of...Contributeur (s):
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Bacher, Cedric / Deslous-paoli, Jean-marc / Heral, Maurice / Prou, Jean - 1986The expansion of shellfish culture businesses (oysters, mussels, clams...) gives way to a competition for the use of limited food resources, especially in the Marennes-Oléron basin where water circulation is slow. Increasing the amount of cultivated molluscs leads, from a biological point of view,...Contributeur (s):
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Heral, Maurice / Deslous-paoli, Jean-marc / Prou, Jean - 1986Recruitment, marketed yield and cultivated biomasses of oysters Crassostrea angulata and Crassostrea gigas are compared to climatic indices for the period 1885-1984. Temperature plays a role up on the date of spawning but explains only partially the failure of recruitment, which has less influence...Contributeur (s):
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Heral, Maurice / Bacher, Cedric / Razet, Daniel / Prou, Jean / Deslous-paoli, Jean-marc - 1986Le bassin conchylicole de Marennes-Oléron assure 40 % des 100 000 tonnes d ' huîtres commercialisées annuellement en moyenne en France (20 000 emplois, 1 milliard de chiffre d'affaire) . La modélisation des équilibres qui s'établissent entre l es stocks mis en culture , et la...Contributeur (s):
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Heral, Maurice / Razet, Daniel / Deslous-paoli, Jean-marc / Manaud, Francois / Truquet, Isabelle / Garnier, Jacqueline - 1984After determining the seasonal features of the hydrobiology of the Marennes-Oléron's estuarine complex in 1976 and 1977 (Héral et al, 1983), based on seasonal campaigns conducted in 15 stations sampled in a tide half-cycle, it was proposed to monitor 5 stations spread out over the entire basin...Contributeur (s):
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Heral, Maurice / Deslous-paoli, Jean-marc / Prou, Jean - 1988After a short bibliographical study of the different approaches for determination of the trophic capacity of a bay for molluscs culture, the authors, with a global mode, show the relations between the growth performance of the oysters Crassostrea gigas in relation with the cultivated stocks. The...Contributeur (s):
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Deslous-paoli, Jean-marc / Heral, Maurice / Goulletquer, Philippe / Boromthanarat, Wilaiwan / Razet, Daniel / Garnier, Jacqueline / Prou, Jean / Barille, Laurent - 1987The study of cultivated ecosystems, once the trophic capacity ha! been determined and the molluscan stocks estimated, requires a knowledge of the evolution of the seasonal consumption of food by molluscs in natural conditions. For Crassostrea gigas, Mytilus edulis, Cerastoderma edule, Ruditapes...Contributeur (s):
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The impact of suspended oyster culture (Crassostrea gigas, Thunberg) on oxygen and nutrient fluxes has been studied in situ, in a coastal lagoon (Thau, France), during a seasonal cycle. On the first plan of the multiple factorial correspondences analysis (MCA), seasons were well discriminated. The...Contributeur (s):