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Master Thesis

Environmental impact assessment of freshwater polyculture: balance between productivity and resource mobilization

Abstract : This study tried to highlight the relative importance of management practices in the environmental impact of integrated multi-trophic aquaculture (IMTA) for three different type of system in France, Romania and Indonesia by using two complementary environmental assessment methods: The Life Cycle Assessment and Emergy Accounting. IMTA practices are based on the combination of complementary species with different trophic and living habits enhancing the ability of the system to use resources (feed and other food sources). The results demonstrate that IMTA practices induce a decrease in the overall impact; particularly local impacts such as the potential eutrophication of water through a better use of resources especially the feed. Independently of the practices used, feed remain the major contributor to the environmental impact of an aquaculture production. In Romania we demonstrated that adding a Chinese carps polyculture bounded to a fed common carp monoculture reduce the overall impact compared to conventional fed Chinese carp polyculture through a better resource use. In France, we investigated the addition of a planted lagoon to the fishpond. Results showed that this practice reduced the impact per square meter but the lack of data on plant production might lead to an underestimation of the benefits of the lagoon. In Indonesia, we investigated the coculture of the giant gourami and the red azolla. According to our results, the coculture allows the reduction of feed use and a decreased potential eutrophication. The combination of the life cycle assessment and the emergy accounting methodology permit a global approach of the environmental impact by the inclusion of all processes involved in the life cycle of a product as well as the contribution of nature in the production and the ability of the system to fit with its environment. For future studies, it would be relevant to complete such analysis with more social and economic aspects to go towards more sustainable practices. France, we investigated the addition of a planted lagoon to the fishpond. Results showed that this practice reduced the impact per square meter but the lack of data on plant production might lead to an underestimation of the benefits of the lagoon. In Indonesia, we investigated the coculture of the giant gourami and the red azolla. According to our results, the coculture allows the reduction of feed use and a decreased potential eutrophication. The combination of the life cycle assessment and the emergy accounting methodology permit a global approach of the environmental impact by the inclusion of all processes involved in the life cycle of a product as well as the contribution of nature in the production and the ability of the system to fit with its environment. For future studies, it would be relevant to complete such analysis with more social and economic aspects to go towards more sustainable practices.
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Master Thesis
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https://dumas.ccsd.cnrs.fr/dumas-02365525
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Submitted on : Friday, November 15, 2019 - 2:16:39 PM
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Nathan Favalier. Environmental impact assessment of freshwater polyculture: balance between productivity and resource mobilization. Life Sciences [q-bio]. 2019. ⟨dumas-02365525⟩

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