In Ivory Coast. the freshwater fishculture in rural areas is mainly on a small scale. This type of breeding in ponds (2 to 4 ares) yields on an average 3 metric tons of fish/ha/year and represents only an activity with self-consumption of products. The yield in intensive pond fishculture Tilapia nilotica is on an average 6 to 7 metric tons/ha/year but yields bigger than 10 metric tons... https://foldlyers.shop/product-category/projector-screens/