Data/hora: 16/06/2024 06:49:17

Provedor de dados: 	5	
País: 	France	
Título: 	Utilisation de l'écho-intégration en recherche halieutique (Analyse de 5 campagnes effectuées dans le Golfe de Gascogne de 1983 à 1987)	
Autores: 	Masse, Jacques.	
Data: 	1988	
Ano: 	1988	
Palavras-chave: 	Echo-intégration; Golfe de Gascogne; Petits pélagiques; Comportement; Evaluation; Acoutic; Surveys; Bay of Biscay; Pelagic fishes; Behaviour; Assessment.	
Resumo: 	Afler a short review of acoustic principles, methodology and purposes of accustic surveys are described and some examples given. IFREMER instrumentation, strategy and calculations used during echo sur veys are  described in details and criticized. Five acouslic sur veys carried o t in the Bay of Biscay between 1983 and 1987 show that several species are generally mixed , and lheir identification is very oflen biased by behaviour phenomena. A new way of classi fying echotraces and interpretating data has been applied to these surveys. The results are summarized in tables and maps. Whenever multispecies structures are concerned, it seems at present impossible to assess absolute biomasses based on acoustic survey method. ln such a situation, acoustic surveys are nevertheless very usefull to study distribution and abundance of pelagic fish and hence to calculate abundance indices in view to follow, population trends	
Tipo: 	Text	
Idioma: 	Francês	
Identificador: 	http://archimer.ifremer.fr/doc/00455/56654/58395.pdf

http://archimer.ifremer.fr/doc/00455/56654/	
Formato: 	application/pdf	
Fonte: 	1988 Ifremer

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