Data/hora: 07/06/2024 07:20:13

Provedor de dados: 	5	
País: 	France	
Título: 	Quelques paramètres permettant de suivre la production organique d'un mollusque bivalve au cours d'un cycle saisonnier	
Autores: 	Bodoy, Alain; Masse, H.	
Data: 	1979	
Ano: 	1979	
Palavras-chave: 	Production; Mollusques bivalves; Production; Molluscs bivalve.	
Resumo: 	Some parameters measuring the production of organic matter, in field conditions, by a population of the bivalve mollusc Donax trunculus have been stu­died. Those studies which are easily done when the population is composed of long lived species become difficult in Mediterranean Sea where the populations are instable and composed of short-lived species. A large qualitative sample has been made every month on which the inter­pretation of cohort succession has been done using the graphical method of CASSIE (1954) which is an useful mean to determine the modal class-size. The monthly values of the weight/size relationship, during a year, show important fluctuations indicating that size increment, tissue weight increment, gamet production and release are often out of phase. Considering weighing data, the study of the ash-free dry weight seems to be a good parameter to give evidence of spawning-period and of adverse environmen­tal conditions. The reproduction for bivalve and particularly for Donax trunculus needs a great deal of energy; this is illustrated by a decrease of the ash-free dry weight ranging from 19 to 27%. Among condition indexes used in the literature, the condition factor of BEUKEMA (1974) seems to be an useful one to follow the physiological state of a population. The results of this study show that Donax trunculus on the Camargue coast (North-West Mediterranean Sea) has a life expectancy exceeding 3 years but fishing-activity shorten it to 2 years. Usually two recruitments per year occur but the settlement-period may be wide spread so that it is sometime difficult to separate the different cohorts. These studies point out that it is important to know the fluctuation of production parameters in a field population before starting studies in experimen­tal conditions. The ash-free dry weight and the length, both easy to mesure, which are used for the condition index calculation are useful to follow the organic matter production cycle and the food value of mollusc meat.	
Tipo: 	Text	
Idioma: 	Francês	
Identificador: 	http://archimer.ifremer.fr/doc/00306/41696/40907.pdf

http://archimer.ifremer.fr/doc/00306/41696/	
Editor: 	Publications du Centre National pour l'Exploitation des Océans (CNEXO). Série : Actes de colloques, n° 7, 1979, pp. 753-766	
Formato: 	application/pdf	
Fonte: 	Centre National pour l’Exploitation des Océan, 1979

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