Data/hora: 07/06/2024 09:10:28

Provedor de dados: | 5
País: | France
Título: | Stimulation of bacterial exoproteolytic activity by fish farming in coastal marine ponds: Effect on dissolved protein cycling
Autores: | Garet, Marie-josé; Reymond, Hugues; Delmas, Daniel.
Data: | 1997
Ano: | 1997
Palavras-chave: | Activité exoprotéolytique bactérienne; Protéines dissoutes; Intensification de l'aquaculture; Marais maritimes; Bacterial exoproteolytic activity; Dissolved proteins; Aquaculture; Coastal marine ponds.
Resumo: | The effect of fish farming on dissolved amino acid concentrations, bacterioplankton abundance and exoproteolytic activity was assessed in 3 experimental marine ponds. Different standing stocks of fish were introduced (semi-intensive pond: 250 g.m(-2); semi-extensive pond: 50 g.m(-2) control pond: 0). Sea bass farming increased dissolved combined amino acid (DCAA) concentrations only in the semi-intensive pond. Bacterial standing stock was unaffected by fish food supply. However, bacterial exoproteolytic activity was strongly stimulated by aquaculture intensification; the average maximal rate of dissolved protein hydrolysis (V-m) increased with intensity (control pond: 1 500 nM.h(-1); semi-extensive pond: 2 600 nM.h(-1) semi-intensive pond: 5 100 nM.h(-1)). DCAA fluxes through bacterial exoproteolytic activity ranged between 16 (semi-extensive) and 11% (semi-intensive) of the daily nitrogen input by fish food. Bacterial exoproteolytic activity allowed a substantial part of the increased supply of dissolved amino nitrogen to be incorporated into bacterial biomass, then available for transfer to higher trophic levels within the ponds. It also significantly decreased dissolved organic nitrogen export from the ponds to the surrounding environment.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00336/44766/44701.pdf

DOI:10.1051/alr:1997024

http://archimer.ifremer.fr/doc/00336/44766/

Editor: | Edp Sciences S A
Formato: | application/pdf
Fonte: | Aquatic Living Resources (0990-7440) (Edp Sciences S A), 1997 , Vol. 10 , N. 4 , P. 221-229

Fonte:

IFREMER-Gauthier-Villars

info:eu-repo/semantics/openAccess

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