Duckweed Aquaculture: A New Aquatic Farming System for by Paul Skillicorn

By Paul Skillicorn

".....THIS TECHNICAL research IS aimed toward the subsequent AUDIENCES:
(a) confirmed fish farmers who wish to scan with duckweed as a fish feed, and employees of agricultural extension providers concerned as a fish culture;

(b) scientists of aquaculture learn institutes who could begin pilot operations and utilized learn on duckweed;

(c) employees of bilateral and multilateral donor firms who may well advertise investment for duckweed study and pilot operations; and

(d) wastewater experts in governments and donor firms who may perhaps advertise wastewater therapy vegetation in keeping with duckweed along side fish culture....."
[from the publication of the foreword via Harinder S. Kohli]

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Mirror carp are easily caught from the pond perimeter by throw net, and most were stolen by intruders before action was taken to increase pond security. Once the value of the fish in the Mirzapur experimental ponds became known, it became necessary to employ nighttime guards. Management of the security force is an added concern and operating cost. Fish mortality has not been an issue so far in the Mirzapur experimental program. There have been no fish kills or outbreaks of disease. Water quality appears to be good and the fish appear to be in good health, even at relatively high densities for the semi-intensive system.

These data help the farmer to track the 36 growth rate of his fish and to estimate the quantity and quality of future harvests. Routine harvesting of duckweed-fed carp began approximately six months after the Mirzapur polyculture pond was stocked. Biweekly harvesting was the preferred pattern, following a simple protocol to take the largest fish (75 to 100 percentile) and the smallest (Oto 25 percentile) in each species. The rationale is the assumption that the largest fish will have a declining growth rate and that the small fish are simply poor performers.

Pigment losses of about one-third to onehalf may be expected after two days in the sun. Dried duckweed is a light, fluffy material whose density must be greatly increased to be handled efficiently and transported at affordable cost. The dried whole meal can be pelletized in standard commercial equipment without the need of a binder. Figure 12. _ - r 1 ri ^~~~~~~~~~ - f -~ U//de, 5 ,oa/ ^ &V Figurel3. Drying duckweed in the sun and bagging dried meal in opaque plastic bags 21 Section 3 - Duckweed-Fed Fish Production Introduction Carp species are the most widely cultivated family of freshwater fish.

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