Data/hora: 27/07/2024 02:50:52

Provedor de dados: 	5	
País: 	France	
Título: 	Recherche des pesticides organochlores dans les milieux littoraux	
Autores: 	Fougeras Lavergnolle, Jean.	
Data: 	1971-10	
Ano: 	1971	
Resumo: 	Contamination from pesticides worries hygienists, who fear that content levels will rise in food to the point of causing incidents. The use of pesticides is becoming more generalised, for they have been found in noticeable concentrations in the marine environment, where they have even caused accidental mortalities of animal life, following a treatment against parasites along a riverbank. Thus, shrimp mortalities were observed along the South Carolina coast a few days after a heptachlor treatment (SOUDAN). Many authors, especially BUTLER and DAVIS, agree on recognising that organochlorines are the most toxic pesticides; DDT is one of the most toxic. BUTLER (1966) has shown that oysters are very good detectors of organochlorine pesticides, which they concentrate rapidly in their tissues, but which they eliminate when the environment is not contaminated. The tissues accumulate DDT at much higher concentrations than those in the surrounding water. The accumulation, which varies depending upon the concentration in the water, the temperature and the duration of exposure, can reach 70,000 times that of the ambient environment. Nonetheless, as long as the concentration in the water is below 0.002 ppm, the oysters grow and behave normally. It seemed like a good idea to see how things were along the French coasts by using oysters as a reference. A first series of measures was taken for informational purposes in the context of research pursued in this sphere by Professor J. BRISOU. We tried to learn about the organochlorine insecticide contamination in a few typical coastal areas that are, beforehand, exposed to this kind of contamination or that are, on the contrary, sheltered from it. In each of the areas examined, specimens were taken in a relatively open environment, a priori not very contaminated, and in an environment more exposed to contamination coming from land. At the same time, the pesticides were dosed in the sediments of the grounds from which the oyster came. Portuguese oysters (Crassostrea angulata, LMK) weighing around 60 to 80 kg per thousand were taken between 26 and 31 May 1969 in the following 10 places: Cancale Bay, Bourgneuf Bay, coasts of Ile d'Aix, Oléron basin to the north of the Lamouroux bank, Arcachon basin to Piquey, estuary of the Pénerf river, Fier d'Ars on the Ile de Ré, Barat bank in the Seudre estuary, Arcachon basin to la Teste, Thau basin.	
Tipo: 	Text	
Idioma: 	Francês	
Identificador: 	http://archimer.ifremer.fr/doc/1971/publication-2373.pdf	
Editor: 	ISTPM	
Relação: 	http://archimer.ifremer.fr/doc/00000/2373/	
Formato: 	application/pdf	
Fonte: 	Revue des Travaux de l'Institut des Pêches Maritimes (0035-2276) (ISTPM), 1971-10 , Vol. 35 , N. 3 , P. 367-371	
Fonte: 	Ifremer