Water treatment of land-based fish farm effluents by outdoor culture of marine diatoms |
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Authors: | S Lefebvre J Hussenot N Brossard |
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Institution: | (1) Centre de Recherche en Ecologie Marine et Aquaculture, (CNRS-IFREMER), B.P. 5, 17137 L'Houmeau, France |
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Abstract: | The feasibility of using fish farm effluents was evaluated as a source of inorganic nutrients for mass production of marine diatoms. Batch cultures were conducted from May to July 1995 in 16-L outdoor rectangular tanks, homogenized by gentle aeration (0.2 L
air
L–1 h–1). The effluents from the two fish farms studied were both characterized by high concentrations of inorganic materials (NH4-N, PO4-;P, Si(OH)4-Si) and were shown to support production of marine diatoms. Moreover, periodic measurements of inorganic matter levels in the cultures showed that clearance was efficacious (90% in 3–5 days). Water purification efficiency and culture productivity were further increased through appropriate nutrient balancing. When effluents were limited in silicate, addition of Na2SiO3 induced a significant increase in both diatom biomass and nutrient removal efficiency. In this case, up to 720 000 cell mL–1 were produced dominated bySkeletonema costatum. By contrast, in effluents loaded with silicate, adjustment of the N:P:Si ratio by NH4-N and PO4-P supplementation then gave increased biomass production. In this case, the maximum cell density found was 450 000 cell mL–1, dominated byChaetoceros spp.Author for correspondence |
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Keywords: | water treatment mariculture effluents phytoplankton diatoms Skeletonema Chaetoceros mass culture |
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