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Berthome, Jean-paul / Razet, Daniel / Garnier, Jacqueline - 1978The detection of larval oysters emissions and their evolution were studied in the Seudre river along with meteorological and bydrobiological datas. The earlier oyster emissions were found betveen july 4th and 8th and they developed into the fixation of the spat from july 14. The bydrobiological...Contributeur (s):
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Berthome, Jean-paul - 1976Au cours d'une campagne effectuée dans le bassin de Marennes-Oléron en début juillet 1976, il a été observé un développement important du dinoflagellé Prorocentrum micans EHR. Bien que sa répartition ait été soumise à l'influence des marées, deux zones de fortes concentration sont restées...Contributeur (s):
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Heral, Maurice / Berthome, Jean-paul / Polanco Torres, E. / Alzieu, Claude / Deslous-paoli, Jean-marc / Razet, Daniel / Garnier, Jacqueline - 1981The appearance and changes of the oyster shell's gelatinous bags have been monitored since 1979. The increase in thickness that causes the growth into a "ball" can be explained by an overproduction of gel. The various environmental factors that can intervene in the secretion of gel...Contributeur (s):
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Berthome, Jean-paul / Deslous-paoli, Jean-marc / Heral, Maurice / Razet, Daniel / Garnier, Jacqueline - 1982The want of C. gigas spat-catching in the Marennes-oleron basin in 1981 can be due to various different reasons which are analysed here. Physico -chemical and trophic factors that can induce variations in the quality of gametogenesis, are successively in comparison with the year 1979 when...Contributeur (s):
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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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Consequences of drought and canicule during the summer of 1976 are related. An analysis allow as to mark out five main districts : Charente, Seudre, North, South and Center of the bassin, each of them with distinctive hydrological and phytoplaktonic characteristics. The rivers Charente and Seudre...Contributeur (s):
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Three oyster samplers, collected in 1976, 77 and 78 have beer grown, each one after 3 differents densities in order to determine the influence of the load of breeding over growth and improvement of quality of oysters. The results show that quality of oysters is rapidly altered when the density of...Contributeur (s):
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Lassus, Patrick / Berthome, Jean-paul - 1987Laboratory bioassays have been performed. using toxic P. tamarensis mass cultures (MOG 835), in order to assess potential depuration kinetics of PSP contamined cultured blue mussels. Besides, from fields observations and translocation experiences to safe area, we have seeked for probable depuration...Contributeur (s):
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Berthome, Jean-paul - 1991Le projet de développement d'un réseau instrumenté de surveillance de l'environnement littoral correspond à une nécessité d'observations, sur de longues séries temporelles, et de mesures à des fréquences élevées. Il est le résultat d'une analyse des besoins des différents types...Contributeur (s):
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Belin, Catherine / Berthome, Jean-paul - 1988In 1986, 23 discolored waters were observed ; dinoflagellates often were the cause of them. Many developments of Prorocentrum minimum occured ; two of them were associated with shel1fishes mortalities. At contrary, other species which are suspected to be toxic for shellfishes, as Gyrodinium...Contributeur (s):
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Berthome, Jean-paul / Lassus, Patrick - 1984Comme les années précédentes (1980 à 1983) nous avons dressé ici un récapitulatif géographique (du Nord au Sud) des principales perturbations phytoplanctoniques observées sur les côtes françaises en 1984.Contributeur (s):
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Berthome, Jean-paul / Belin, Catherine - 1988In 1985, twenty discolored waters have been observed with dinoflagellates as the most frequently encountered group. Shellfishes mortalities due to occurence of Gyrodinium spirale were observed in Etang de Thau. Likewise, the growth of molluscs juveniles was inhibited by a bloom of Gyrodinium...Contributeur (s):
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Berthome, Jean-paul / Prou, Jean / Bodoy, Alain - 1986Growth of the japanese oyster, Crassostrea gigas was monitored during 4 years, by following the recruitment of the year 1978, held in rearing conditions. After three and half years, the average length was la cm and the average total weight was 80 g. Clear seasonal changes were observed on the...Contributeur (s):
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Three indexes of quality of Japanese oyster Crassostrea gigas were studied in 3 lots of oysters bred in the r.1arennes-oléron basin from february to july 1979: condition index of MEDCOF &-. NEEDLER, thickness coefficient of IMAI & SAKAI and external quality coefficient of BERTHOME. These...Contributeur (s):
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Bodoy, Alain / Prou, Jean / Berthome, Jean-paul - 1986Among the different condition indices, some of them were compared on a population of the japanese oyster, Crassostrea gigas. The follow-up of experimental racks was performed monthly during four years. The use of dry weight in condition indices gave a more precise and more reliable representation...Contributeur (s):