Biofloc fish farming

  • Md Zahid and Kamrul Hasan are farming fish by using biofloc technology in Dhaka’s Bosila for a year. Photo: Mahmud Zaman Ovi

    Md Zahid and Kamrul Hasan are farming fish by using biofloc technology in Dhaka’s Bosila for a year. Photo: Mahmud Zaman Ovi

  • A fish fully grows in only four months in biofloc farming. Md Zahid, an owner of The Organic Agro farm in Dhaka, says he gets fish twice a year. Photo: Mahmud Zaman Ovi

    A fish fully grows in only four months in biofloc farming. Md Zahid, an owner of The Organic Agro farm in Dhaka, says he gets fish twice a year. Photo: Mahmud Zaman Ovi

  • A 2,800 litre tank is used to farm 4,500 Tilapia fish. Each will weigh 300 to 350 grams when ready for sale. Photo: Mahmud Zaman Ovi

    A 2,800 litre tank is used to farm 4,500 Tilapia fish. Each will weigh 300 to 350 grams when ready for sale. Photo: Mahmud Zaman Ovi

  • The Organic Agro is farming 12,000 Koi carp fishes in a 45,000-litre tank. As many as 14 fish will weigh one kg when ready for sale after four months. Photo: Mahmud Zaman Ovi

    The Organic Agro is farming 12,000 Koi carp fishes in a 45,000-litre tank. As many as 14 fish will weigh one kg when ready for sale after four months. Photo: Mahmud Zaman Ovi

  • Oxygen is needed to be pumped into water in biofloc fish farming because of the high density of fish in the tanks. Photo: Mahmud Zaman Ovi

    Oxygen is needed to be pumped into water in biofloc fish farming because of the high density of fish in the tanks. Photo: Mahmud Zaman Ovi

  • Workers weigh the fish every week to determine their health. Photo: Mahmud Zaman Ovi

    Workers weigh the fish every week to determine their health. Photo: Mahmud Zaman Ovi

  • The fish are fed every morning and afternoon in biofloc fish farming. Photo: Mahmud Zaman Ovi

    The fish are fed every morning and afternoon in biofloc fish farming. Photo: Mahmud Zaman Ovi