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Effect of Use of Duckweed Powder as a Fish Feed on Polyculture of Carps

M. Paul
BFRI, Freshwater station, Mymensingh,

A. C. Barman
BFRI, Freshwater station, Mymensingh,

M. F. Siddque
BFRI, Headquaters, Mymensingh

A. Bhadra
BFRI, Headquaters, Mymensingh

M. S. Rahman
Department of Fisheries Management, BAU, Mymensingh

Abstract/ Executive Summary:

An experiment on the use of duckweed (Lemna minor) powder as an ingredient of feed on production of rui (Labeo rohita), mrigal (Cirrhinus cirrhosus) and silver carp (Hypophthalmicthys molitrix) in polyculture, was conducted in six ponds for a period of three months. The experiment was carried out under two treatments, each with three replications. Mean survival rates under treatment-I and treatment-II were 95.55% and 88.88% respectively. The specific growth rate (SGR, % per day) of the fish found under treatment-I and treatment-II were 0.28% and 0.25% respectively. The calculated net fish production of the ponds under treatment-I was 1.416 ton/ha/yr and that of the ponds under treatment-II (control) was 0.846 ton/ha/yr. The net fish production of T-I was significantly (p<5%) higher than that of T-II.

Keywords: Fingerlings, Mrigal, Rui, Silvercarp, SGR%

Location: BFRI, Freshwater station, Mymensingh

Start Date: 00-05-2012

End Date: 00-09-2012

Program Area: Animal Health and Management

Commodity: Feed

Objectives:

1. To evaluate the use of duckweed powder as an ingredient of low cost supplementary feed on the survival and growth of Mrigal, Rui and Silver carp in polyculture; 2. To compare the growth and production of Mrigal, Rui and Silver carp in polyculture; and to compare cost and benefit of Mrigal, Rui and Silver carp productions between two different treatments.

Methodology:

The ponds were rectangular in size and similar in area (about 40 m²), depth and basin bottom soil type and contour . The experiment was conducted in a series of six earthen ponds each having an average depth of 0.74 m. The experiment was performed in Completely Randomized Design (CRD) in which two treatments (T-I and T-II) each with three replications were used. Seven days after liming urea and triple super phosphate (TSP) were applied at the rate of 100 g/decimal and 100 g/decimal respectively as initial doses. Fingerlings of L. rohita, C. mrigala and H. molitrix were stocked in the ponds at the density of 60 fish per decimal after 7 days of fertilization. The initial average length of L. rohita, C. mrigala and H. molitrix were 11.96 cm, 9.33 cm and 9.13 cm respectively. The initial average weight of L. rohita, C. mrigala and H. molitrix were 22.67 g, 8.33 g and 6.83 g respectively. Survival rate, growth and production of fish were estimated. T-test of net fish productions of the ponds under treatment-I and treatment-II was done by a computer using SPSS (Statistical Packages for Social Science) package programme.

Source of Information: J. Environ. Sci. & Natural Resources, 6(2): 213 -216, 2013; ISSN 1999-7361

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Duckweed powder-based polyculture technology may be recommended for the resource-poor rural fish farmers of the country because this technology can be an economically highly viable and sustainable technology for improving their livelihood.

Knowledge Management: Journal