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Effects of fish farming on microbial enzyme activities and densities: comparison between three Mediterranean sites (Articolo in rivista)

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Effects of fish farming on microbial enzyme activities and densities: comparison between three Mediterranean sites (Articolo in rivista) (literal)

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Alternative label

Caruso G., Genovese L., Mancuso M., Modica A. (2003)
Effects of fish farming on microbial enzyme activities and densities: comparison between three Mediterranean sites
in Letters in applied microbiology; Blackwell Publishing, Oxford (Regno Unito)
(literal)

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prodotto con 12 citazioni ISI, 12 citazioni su Google Scholar, 11 citazioni su SCOPUS, SJR 2011 : 0.641, SJR 2009: 0.635, IF rivista (2009): 1.64 -The article is the result of a scientific cooperation between the Institute for Marine Coastal Environment Section of Messina and the Mediterranean Oceanological Centre-Palermo, that took place in the framework of a microbiological study carried out throughout the steps of the productive process, from rearing to the final product (literal)

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Carried out in the framework of a wider research programme aimed at assessing the impact of offshore fish farming on the environment, the study contributes to elucidate the role of the microbial community within the biogeochemical cycles through the determination of the potential decomposition rates of the main organic compounds. Despite of the well-known importance of microbial processes in regulating C, N, P fluxes through aquatic ecosystems, little is known on the physiological capabilities of heterotrophic bacteria and, in particular, on their in situ extracellular enzyme activities over various organic polymers. The investigation was performed on both the pelagic and benthic compartments using specific fluorogenic substrates; microbial metabolic activity and density data obtained before and after cage installation were compared. The increased trophic load (in terms of feed wastes, faecal pellets) resulted in an increase of activity values especially in the sediment, that was the compartment most affected by fish farming activities. The study performed contributes to the understanding of the ecological significance of marine microorganisms through the knowledge of their role in the decomposition processes of organic matter. (literal)

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CNR Istituto per l'Ambiente Marino Costiero - Sezione di Messina Centro Ocenologico Mediterraneo- ENI group, Palermo (literal)

Titolo

Effects of fish farming on microbial enzyme activities and densities: comparison between three Mediterranean sites (literal)

Abstract

Aim: The effects of fish farming on microbial enzyme activities and heterotrophic bacterial density were investigated in three Mediterranean sites before and after the start of mariculture. Methods and Results: Microbial activities were measured on water and sediment samples by using fluorogenic substrates specific for leucine aminopeptidase, beta-glucosidase and alkaline phosphatase (AP); bacterial counts were determined by Marine agar plates. Significance and Impact of the Study: Comparison of activity and abundance values obtained before and after the experiment showed that fish farming mainly affected the levels of microbial activities; they were significantly enhanced both in water and sediments, reaching an increase of 183.66 times for AP in Castellammare Gulf. After mariculture, no significant variations were recorded in heterotrophic bacterial density in the waters, while significant changes were observed in the sediments. Effects induced appeared to be extended not only to stations in which cages were located, but also to control sites far from the direct influence of fish farming. (literal)

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