Effects of a lagoon on performances of a freshwater fishpond in a multi-trophic aquaculture system

Integrated multi-trophic aquaculture (IMTA) is a way to help preserve the environment while maintaining good level of total production. An ecologically semi-intensive pond system was designed in which polyculture fishpond associated with lagoon planted macrophytes bioremediate water. The properties this “semi-intensive coupled” (SIC) were compared those (SI) and extensive (E) systems, each contained single same fish (common carp (Cyprinus carpio), roach (Rutilus rutilus), perch (Perca fluviatilis)) as SIC. E differed that it had half initial density fish, not fed. Fish growth performances, water quality (chemical biological indicators), chlorophyll concentrations, invertebrate production measured. systems based on performances physicochemical characteristics, then described using principal component analysis (PCA). Carp two fed higher than E. Compared SI, SIC, induced decrease 15% 83% concentration (a proxy for phytoplankton) but improved (−34%, −60% −80%, concentrations nitrogen, phosphorus, blue green algae (for micro-algae class Cyanophyceae), respectively). According PCA, SIC clearly from SI benthic macro-invertebrate brown Dinophyceae or branch Bacillariophyta) oxygen parameters (dissolved saturation), estimated annual zooplankton production, pH. In conclusion, reveal perspectives environmentally friendly practices, biodiversity secondary order enhance