Evolution of Earthen Pond Water Chemical and Physical Parameters in Polyculture System (Case of Nile Tilapia, Largemouth Bass, Chinese Carps) at Deroua Fisheries Station (Fkih Ben Saleh, Morocco)

Continental fish farming has become one of the essential activities ensuring food security and maintaining high socio-economic impact values. Yet, inland aquaculture is still facing major constraints, relating particularly to water supply and quality. Water quality represents a major concern in aquaculture, as it may considerably result in limiting fish production. In this respect, the present study was conducted at the Deroua Fisheries Station, Fkih Ben Saleh in central Morocco, over the months of June to December 2013, on the rearing of Nil Tilapia in polyculture with the Black Bass and the Chinese carps. The study was aimed at monitoring the evolution of the fish-rearing water physical and chemical parameters, to determine whether the water’s quality displays any variations in regard of the fish-rearing recommended standards. This study has concerned nineteen ponds of 2000 m² in surface area.