Hassenrueck, Christiane, Bachmann, Jennifer, Hanke, Inken, Moncada, Chyrene, Conaco, Cecilia, Grossart, Hans-Peter and Gärdes, Astrid (2018) Evaluating impacts of intensive milkfish aquaculture on water quality, organic matter loading, and bacterial communities in Bolinao, Philippines. [Poster] In: ISME 17. , 12.08. - 17.08.2018, Leipzig, Germany .

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Intensive milkfish aquaculture is gaining in importance to provide fish for local consumption in the Philippines, irrespective of ecological and health concerns. To promote more sustainable aquaculture practices, this study investigated the effects of intensive open-cage aquaculture on local water quality, organic matter (OM) loading, and bacterial communities. We sampled the water column at five stations along the Guiguiwanen Channel (Bolinao, Philippines), covering a gradient from the entrance of the channel, without fish cages and a more pronounced influence of the open ocean, to the secluded interior, exploited by numerous fish cages. Intensive aquaculture led to a reduced pH (7.8), oxygen concentrations close to hypoxia, and two to five times elevated concentrations of inorganic nutrients. Tidal currents moved water with increased particulate OM loading from the interior of the channel to areas otherwise less affected by aquaculture. Carbon to nitrogen ratios of these particles suggested that they derived primarily from fish feed (C:N ratio 8). Full-length amplicon sequencing of the 16S rRNA gene will further provide data on bacterial communities in the water column (both free-living and particle-attached) at a high taxonomic resolution. Thereby, we aim to identify potentially harmful strains, supplementing the sequence-based analysis by quantitative PCR of marker genes for pathogenic bacteria, such as Vibrio parahaemolyticus and V. cholera, and antimicrobial resistance genes. Our goal is to provide a holistic assessment of the effects of intensive open-cage aquaculture, identifying potential indicators for detrimental impacts on animal and human health for more sustainable management of this rapidly growing industry.

Document Type: Conference or Workshop Item (Poster)
Research affiliation: Biogeochemistry and Geology > Tropical Marine Microbiology
Affiliations > Not ZMT
Projects: ACUTE
Date Deposited: 19 Dec 2019 14:45
Last Modified: 01 Oct 2020 13:00
URI: http://cris.leibniz-zmt.de/id/eprint/3151

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