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| Registros recuperados: 11 | |
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| Maurer, Daniele; Comps, Michel; His, Edouard. |
| Summer mortalities in the Pacific oyster in the Bay of Arcachon were analysed during four years (1981 to 1984). Mortalities occur mostly among one year old oyster and affect the whole bay, with different prevalence. The phenomenon occurs at certain times during the summer spawning period and is associated with high temperatures. A thinning of the digestive tubule epithelium is observed, but there is no evidence of infectious disease. The failure to find a causative agent, pollution or pathogen, tends to strengthen a physiological disorder hypothesis, related to environmental conditions. The influence of external (temperature, available food) and internai factors (length, maturation, spawning) on this phenomenon is discussed. A comparaison is drawn with... |
| Tipo: Text |
Palavras-chave: Bay of Arcachon; Summer mortalities; Crassostrea gigas; Bassin d'Arcachon; Mortalités estivales; Crassostrea gigas. |
| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/1986/publication-4318.pdf |
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| Fernandez-castro, Nora; His, Edouard; Cantin, Christian. |
| The Bay of Arcachon has been particularly affected by the impact of organotin-based antifouling paints (His, 1996). Boring gastropods, Ocenebra erinacea, have completely disappeared from the Bay, because of the castration induced by these compounds, from 1980 to 1990. There have been no studies on imposex effects in the Bay of Arcachon since the investigations of Poli (1972) who first described the phenomenon, and of Féral (1982) who attributed it to TBT. Recently, Sarradin & al. (1991) demonstrated the persistence of TBT and its degradation products in the sediments of the Bay, the latter being a potential source of pollution; Stroben & al. ( 1995) have conceived a contamination scale based on the VDSI (Vas Deferens Sequence Index) in prosobranch... |
| Tipo: Text |
Palavras-chave: Bassin d'Arcachon; Imposex; Ocenebra erinacea; TBT; Bay of Arcachon; Imposex; Ocenebra erinacea; TBT. |
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00038/14898/12224.pdf |
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| Maurer, Daniele; Borel, Michel. |
| Two-year-old oysters have a physiology which is reproduction-oriented, their maturation occurring synchronously among oysters from the same batch. The importance of the spring accumulation of glycogenated stocks varies through the years and correlates with the growth stage. Glucidic components are quickly used during the month preceding egg-laying and are transformed into lipid stocks for the oocytes. One-year-old oysters develop at different rates, some of them not showing any sign of maturation and the percentage of laying individuals varies through the years. Glycogenated stocks accumulate in a similar way in both age-classes and their more precocious and more intense use by young molluscs is not necessarily linked with their gametogenesis and growth,... |
| Tipo: Text |
Palavras-chave: Bay of Arcachon; Maturation; Biochemistry; Crassostrea gigas; Bassin d'Arcachon; Maturation; Biochimie; Crassostrea gigas. |
| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/1985/acte-6182.PDF |
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| Maurer, Daniele; Borel, Michel; Dreno, Jean-paul. |
| L'élaboration d'un modèle de gestion d'un bassin conchylicole nécessite, en particulier, la connaissance de l’évolution des stocks d'huîtres d'une année à l'autre afin d'en apprécier l'influence éventuelle sur le rendement. Le présent travail décrit la méthodologie utilisée et les résultats obtenus au cours de la première estimation du stock d'huîtres Crassostrea gigas en élevage dans le bassin d'Arcachon en 1985. Cette estimation nécessite l'utilisation simultanée de photographies aériennes (évaluation de la surface réellement exploitée ) et de sondages-terrain (évaluation de la biomasse par unité de surface). Ces derniers ont également permis de valider les résultats obtenus par photographie. En 1985, le taux d'exploitation variait, selon la zone... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Biomasse; Bassin d'Arcachon; Crassostrea gigas; Biomass; Bay of Arcachon. |
| Ano: 1987 |
URL: http://archimer.ifremer.fr/doc/00102/21342/18965.pdf |
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| Robert, René; Borel, Michel; Pichot, Yves; Trut, Gilles. |
| A study of the growth and mortality of the European oyster Ostrea edulis , including the effects of Marteilia refringens and Bonamia ostreae , was carried out in three oceanic areas in the Bay of Arcachon from May 1989 to February 1991. One-year-old spat, free from disease were used for the trials. Six months after beginning the trials, Marteilia refringens had severely infested the cultures. Although Bonamia ostreae was found during the first year, the rate of infestation was low. In the second year bonamiasis increased and high mortality (> 60%) occurred in Ostrea edulis populations. Although the growth of the oysters was good, their condition index was generally poor. Moreover, shell perforations by Polydora sp. were observed. The influence of... |
| Tipo: Text |
Palavras-chave: Ostrea edulis; Pathologie; Mortalité; Croissance; Reproduction; Composition biochimique; Bassin Arcachon; Ostrea edulis; Pathology; Mortality; Growth; Reproduction; Gross biochemical composition; Bay of Arcachon. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00015/12600/9477.pdf |
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| Robert, Rene; Trut, Gilles; Borel, Michel; Maurer, Daniele. |
| The Stanway cylinder was tested in the bay of Arcachon from September 1989 to August 1991. Trials were mainly performed on the Japanese oyster Crassostrea gigas in a wind-exposed area. The seed, spat, 18 month old oysters development and fattening of 2 year old oysters were studied. Compared to plastic bags the Stanway cylinder has high positive effects on survival and growth of Crassostrea gigas seed. It also has positive effects on commercial sized Crassostrea gigas fattening. Nevertheless, the cylinder has negative effects on the growth of Crassostrea gigas spat and 18 month old oysters, except for width. However, oyster quality is greatly improve : higher condition index, higher carbohydrate contents and higher shell densities were recorded. Because... |
| Tipo: Text |
Palavras-chave: Bay of Arcachon; Culture methods; Growth; Crassostrea gigas; Bassin d'Arcachon; Technique d'élevage; Croissance; Crassostrea gigas. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/1992/rapport-1644.pdf |
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| Cantin, Christian. |
| Après avoir rapidement présenté le Bassin d'Arcachon et son environnement (situation géographique et réseau hydrologique), et rappelé quelques données sur l'ostréiculture, le tourisme et le réseau d'assainissement, le réseau de surveillance microbiologique (REMI) est décrit depuis sa mise en place en 1989 (réseau principal) jusqu'à son évolution en 1995 avec la mise en oeuvre d'un réseau étendu. Les résultats des analyses effectuées mensuellement sur les huîtres, au cours de ces sept années, sont présentés pour chaque station sous forme graphique, répartis en quatre secteurs géographiques. lls ont été interprétés pour chaque réseau en fonction des quatre zones de salubrité définis par l'arrêté relatif aux classements des zones de production, et, ensuite... |
| Tipo: Text |
Palavras-chave: Bactériologie; Huîtres; Bassin d'Arcachon; Bacteriology; Oysters; Bay of Arcachon. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00427/53819/54808.pdf |
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| Registros recuperados: 11 | |
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