By Paul Skillicorn
".....THIS TECHNICAL examine IS aimed toward the next AUDIENCES:
(a) validated fish farmers who wish to scan with duckweed as a fish feed, and employees of agricultural extension prone concerned as a fish culture;
(b) scientists of aquaculture examine institutes who may perhaps begin pilot operations and utilized learn on duckweed;
(c) employees of bilateral and multilateral donor businesses who may perhaps advertise investment for duckweed learn and pilot operations; and
(d) wastewater experts in governments and donor companies who might advertise wastewater therapy vegetation in accordance with duckweed along with fish culture....."
[from the publication of the foreword by way of Harinder S. Kohli]
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Additional resources for Duckweed Aquaculture: A New Aquatic Farming System for Developing Countries
The profitability of duckweed-fed fish production is most sensitive to the price of fresh fish, and the cost of investment capital, but reasonably insensitive to the price of fresh duckweed. A 30 percent decrease in the price of fish reduces the internal rate of return to 45 percent. However, a 30 percent increase in the price of duckweed only reduces the internal rate of return from 85 percent to 80 percent. 48 Section 5 - Duckweed-Based Wastewater Treatment Systems Effective treatment of nightsoil and wastewater, at both the village and urban level, remains an elusive objective in most developing countries.
Uneaten or poorly digested feed results not only in lost productivity, but also contributes to oxygen depletion. Several light feedings daily are, therefore, preferred to one large feeding. Feeds are usually blended from a variety of vegetable and animal products. Fish grow best on a balanced diet with a balanced amino acid profile. The protein constituent of feed is usually derived from a variety of sources. Pelleted feeds for fish simplify feed management but typically add significantly to operating costs.
The correct type and quantity of fertilizer to apply depends on pond chemistry as well as on fish density, and these requirements vary seasonally and with locality. Managing pond fertility consists of estimating how much a given amount of fertilizer will contribute to overall biochemical oxygen demand (BOD) in addition to the BOD contribution of fish and feed wastes. 24 Supplementaryfeeding Nutritious solid feed costs more than fertilizer, manures, or compost, and is typically less available. Direct feeding of fish is considered supplementary in the conventional carp polyculture model because higher fish densities can be maintained through supplementary feeding.
Duckweed Aquaculture: A New Aquatic Farming System for Developing Countries by Paul Skillicorn