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Duckweed (lemna Minor) as Supplementary Feed of Fishes in Polyculture System

A.C. Barman
Freshwater Station, Bangladesh Fisheries Research Institute, Mymensingh, Bangladesh

K.Gosh
Department of Acquatic Resource Development, Starling University, U.K.

M.A. Alam
Riverine Station,Bangladesh Fisheries Research Institute, Chandpur, Bangladesh

M.M. Khan
Freshwater Station, Bangladesh Fisheries Research Institute, Mymensingh, Bangladesh

M.S. Rahman
Department of Fisheries Management Building, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Abstract/ Executive Summary:

An experiment was conducted to evaluate the effect of duckweed as supplementary feed in polyculture of Tilapia (Oreochromis Niloticus), Common carp (Cyprinus carpio) and Rui (Labeo rohita). Treatment-T₁ was arranged with the supply of duckweed and treatment-T₂ without supply of duckweed. The initial average length to tilapia, Thai Sharpunti, Grass carp, Common carp and Rui were 14.94, 15.26, 16.34, 12.65 and 15.67 cm, respectively and the initial average weight were 62.31, 50.53, 64.34, 30.75 and 48.25 g, respectively for the same. Mean survival rates in T₁ and T₂ were 94% and 95%, respectively. The specific growth rate, SGR (%/day) of Tilapia, Thai, Sharpunti, Grass carp, Common carp and Rui were 0.49, 0.56, 0.86, 1.05, 1.40, respectively in T₁ and 0.26, 0.47, 0.39, 0.76, 0.70, respectively in T₂ for the same. The calculated net fish production was 3.60 t/ha/yr inT₁. The net fish production of T₁ was significantly (p<5%) higher than that of T₂.

Keywords: Duckweed, Feed, Feshes, Polyculture system.

Location: Department of Fisheries Management Building, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Start Date: 00-00-2006

End Date:

Program Area: Animal Health and Management

Commodity: Feed

Objectives:

1. To evaluate the effects of duckweeds on the survival and growth of fishes in polyculture,

2. To compare the growth and production of fishes under different treatments

3. To estimate the limnological conditions of the ponds under treatments.

Methodology:

The experiment was conducted in 2006 for a period of 70 days in six ponds at the South east corner of the Faculty Building, Bangladesh Agricultural University, Mymensingh. The ponds were rectangular in shape, more or less similar in size, depth, basin conformation, bottom –soil type and contour. It was devoid of aquatic vegetation and well exposed to sunlight with a surface area of 1dec with average water depth of 0.85m. The experiment was performed in Completely Randomized Block Design (RBD) under two treatments. Among the six ponds the nos. The ponds were fertilized fortnightly with poultry droppings, urea and triple superphosphate (TSP) @ 5kg/dec, 60g/dec and 90g/dec, respectively. After 7 days of fertilization, fingerlings of Tilapia, Thai Sharpunti, Grass carp, Common carp and Rui at ratio of –Tilapia: Thai Sharpunti: Grass carp: Common carp: Rui=45:30:15:30:30. Duckweeds collected from duckweed ponds were weighed and then supplied to the fish culture ponds under T₁ @ 60% of total body weight of the fish every day. During experimental period, the water quality parameters were recorded fortnightly. Water depth of the ponds was measured by a graduated wooden depth meter. Transparency of water was measured by a Secchi-dise of 30 cm in diameter. During experimental period, the water quality parameters were recorded fortnightly. Water depth of the ponds was measured by a graduated wooden depth meter. Transparency of was measured by a Secchi-disc of 30 cm in diameter. The plankton population was determined by using the following formulae and the number of phytoplankton and zooplankton were expressed as cells/L.

Source of Information: Bangladesh Journal of Agriculture, Vol: 35(1), pp. 49-56, ISSN: 0253-5408

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In the study, between the two treatments the highest production was achieved in T₁ and the reason behind that was the positive role of using duckweed as supplemental feed, ‘t’-test of vet productions between T₁ and T₂ showed significant (p<5%) difference i.e. influence of duckweed on production of fish is positively significant. So it may be concluded that duckweed con be used as supplementary feed in polyculture of fishes.

Knowledge Management: Journal