sustainable development

an example of sustainable development is fish farm. Village has water but not fish. they will go to buy some fish but they must be babies, and male and female. They must give them fish food and wait for them to grown up . After they grown up they we have baby fish for us.The village can eat some the adult fish and they can sell some fish to another village. If the village careful to not make the fish dead,and don't eat them too much and don't sell them too much, they can have enough food forever.