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Production of Thai Sharpunti (puntius Gonionotus Bleeker) in Polyculture with Carps Using Low-cost Feed

A.H.M. Kohinoor
Bangladesh Fisheries Research Institute, Freshwater Station, Mymensingh 2201, Bangladesh

M.G. Hussain
Bangladesh Fisheries Research Institute, Freshwater Station, Mymensingh 2201, Bangladesh

N. Begum
Bangladesh Fisheries Research Institute, Freshwater Station, Mymensingh 2201, Bangladesh

M.S. Islam
Bangladesh Fisheries Research Institute, Freshwater Station, Mymensingh 2201, Bangladesh

Abstract/ Executive Summary:

The effectiveness of duckweed and rice bran as a low cost supplementary feed was compared through a six months production trial of rajpunti (Barbodes gonionotus) with carps. Six earthen ponds of 360 m² each were used for the trial. Three ponds received duckweed, while the other three received rice bran as supplementary feed. Fish biomass after six months of rearing increased to an average of 2,056 kg/ha in ponds which received duck weed and 2,056 kg/ha in rice bran treated ponds. The net profit with duckweed and rice bran worked out to Tk. 69,752 and Tk. 73,480 kg/ha, respectively. This study revealed that duckweed is a low cost supplementary feed, particularly for farmers with limited income.

Keywords: P. gonionotus, Silver carp, Common carp, Polyculture, Duck weed

Location: Bangladesh Fisheries Research Institute, Freshwater Station, Mymensingh 2201, Bangladesh

Start Date: 00-10-1993

End Date: 00-03-1994

Program Area: Animal Health and Management

Non-commodity: Performance

Objectives:

To evaluate the efficacy of duck-weeds (Lemna spp.) as a low cost supplementary feed.

Methodology:

The experiment was carried out from October'93 through March'94 in six ponds of 360 m² each, with an average water depth of 90 em. Fingerlings of rajpunti (Barbodes gonionotus), silver carp (Hypophthalmichthys molitrix) and mirror carp (Cyprinus carpio var specularis) were uniformly stocked in ponds at a stocking density of 20,000, 1,000 and 1,000/ha, respectively. Duckweed was given as supplementary feed in three ponds (T-1) while rice bran was used in the second treatment (T-Il). In both the treatments, fertilization was done with cow dung at fortnightly intervals at a rate of 1,000 kg/ha. The ponds were prepared by draining and application of lime to the pond bottom at the rate of 250 kg/ha. Three days after the application of lime, ponds were filled with ground water and fertilized with cattle manure at the rate of 750 kg/ha. Five days after the application of cattle manure, inorganic fertilizers- urea and TSP were applied 8 and 17 kg/ha, respectively. Five days after the application of fertilizers, fish were stocked in all the ponds. Feeding began immediately after stocking. Rice bran and duckweed were fed at 4-6 and 8-10% of body weight of fish biomass, respectively. Ten percent of the stock was sampled fortnightly, to estimate the growth and standing crop, based on which feeding was adjusted. The important physico-chemical parameters of water viz., temperature (°C), secchi disc transparency (em), pH and dissolved oxygen (mg/L) were analyzed every seven days, following standard methods. The samples of water were collected between 09.00 to 10.00 AM. Plankton samples were collected fortnightly from each of the experimental ponds. Ten liters of water, collected from different locations and depths of each pond, were passed through a plankton net of 25pm mesh size. Filtered samples were transferred into a measuring cylinder and carefully made up to a standard volume of 50 ml. Plankton samples were then preserved in 5% formalin in small plastic vials for subsequent studies. One ml sub-sample was examined under a binocular microscope using a Sedgewick-rafter cell (S-R cell). Plankton cells in 10 randomly chosen squares were counted and used for quantitative estimation using formula. After six months of rearing, the fish were harvested by dewatering the ponds. During harvest, they were counted and individually weighed to assess survival, growth and production. Statistical analysis of all the data was performed using the Student's t-test. One way analysis of variance (ANOVA) was applied.

Source of Information: Bangladesh J. Fish. Res., 3(2): 157-164, 1999

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The use of duckweed in lieu of rice bran as a supplementary feed can give economically satisfactory results, though the net benefit and production per hectare are lower with duckweed. However, it appears to be a viable alternative to rice bran as a supplementary feed for polyculture of rajpunti and carps particularly for farmers who do not have easy access to rice bran.

Knowledge Management: Journal