Data/hora: 03/06/2024 01:22:52

Provedor de dados: | 5
País: | France
Título: | Alimentation et croissance de bivalves filtreurs en bassin aménagé
Autores: | Riva, A.; Lelong, P.
Data: | 1979
Ano: | 1979
Palavras-chave: | Lagune méditerranéenne; Production primaire; Bivalves; Croissance; Mediterranean Lagoon; Primary production; Bivalves; Growth.
Resumo: | The lagoon of Brusc located on the Mediterranean coast (Var­France) is subjected to climatic and hydrologic particular condi­tions. The low values observed for nutrient into the sea water affect the evolution of phytoplankton. Thus chlorophyll concen­tration measured in the lagoon give an annual average of 0.42 mg. m-3 . The growth of two bivalves species : Cerastoderma glaucum and Venerupis semidecussata was compared between two stations where one population of each species are implanted. The culture of this molluscs is made in the lagoon and in outdoor pound dug on the old salt-pan near at hand. In the pound, subjected to natural climatic conditions, a great growth is noted for this two species. The growth rate appear better than the populations of the lagoon. In the closed pound, the phytoplankton biomass is more impor­tant, and chlorophyll concentration measurements varied from 20 mg.m-3 in winter to 0.5 mg.m-3 in summer. This parameter, associated with the hight temperature and salinity during the summer, has stopped the culture of bivalves in the pound. News installations have permitted to enrich the oligotroph lagoon sea water, by a continuous addition of nutrient like chemi­cal fertilizer. The average rate of chlorophyll gives on period of six months 17 mg.m-3, with a maximum value at 71 mg.m-3. When Venerupis semidecussata was stocked in permanent water flow from the outdoor continuous culture, the weight growth rates according to period of 30 days have reached values between 40 and 150 %. In a new pound where the primary production of artificial system is diluted and in the lagoon, the growth rate of bivalves was near zero. The population density in culture are also impor­tant for the growth.
Tipo: | Text
Idioma: | Francês

Identificador:

http://archimer.ifremer.fr/doc/00306/41674/40883.pdf

http://archimer.ifremer.fr/doc/00306/41674/

Editor: | Publications du Centre National pour l'Exploitation des Océans (CNEXO). Série : Actes de colloques, n° 7, 1979, pp. 415-436
Formato: | application/pdf

Fonte:

Centre National pour l’Exploitation des Océan, 1979

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