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Effects of Bamboo Trimmings on the Growth and Production of Indian Major Carp, Labeo Rohita (hamilton, 1822)

M. Nahiduzzaman
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh

M.A. Mannan
World Fish Centre - Bangladesh & South Asia Office, Dhaka

S.N. Sarker
World Fish Centre - Bangladesh & South Asia Office, Dhaka

M.A. Sultana
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh

M.A. Sayeed
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

An experiment was carried out with bamboo trimmings (T₁) and without bamboo trimmings (T₂) for a period of 168 days starting from 08 August, 2007 to 25 January, 2008 to observe the eefect of bamboo trimming on the growth and production of Labeo rohita. Eight ponds were used for the study with average pond size was 12.67 dec., and all the ponds were stocked with fingerling of Labeo rohita at the rate of 40 dec^-1. Numbers of bamboo trimmings were 480 dec^-1. Ponds were fertilized regularly, however, no supplementary feed were applied. The physico-chemical parameters of water quality were more or less within the suitable range in both the treatments except water temperature which decreased abnormally during December and January. The addition of bamboo trimmings increased weight gain and production of Labeo rohita 2.54 and 2.49 times, respectively. The mean survival rate was 79.37±2.41 and 80.21±3.83 in T₁ and T₂. It is concluded that bamboo trimmings are necessary to promote growth of periphyton grazing fish.

Keywords: Bamboo trimming, Labeo rohita, Growth and production

Location: Eight farmer’s pond under Bogra sadar upazila of Bogra district

Start Date: 08-08-2007

End Date: 25-01-2008

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

1. To determine the profitability of using bamboo trimmings as periphyton substrate.

Methodology:

Study site, period and design: The study was conducted in eight farmer’s pond under Bogra sadar upazila of Bogra district for a period of 168 days during 08 August, 2007 to 25 January, 2008. The experiment was carried out with two treatments such as T₁ (with bamboo trimmings) and T₂ (without bamboo trimmings). A total of eight ponds have been selected with an average size of 12.67 dec areas. Pond preparation: The ponds were poisoned at a rate of 50 g dec.^-1 ft.^-1 water depth. Six days after poisoning the ponds were limed at a rate 250 kg ha^-1. Five days later basal doses of fresh cow manure, T.S.P and urea were applied at rates of 2500, 50 and 25 kg h^-1, respectively. Following basal fertilization, bamboo trimmings of 175 cm lengths were ‘planted vertically 35 cm into the pond bottom mud with 140 cm of bamboo in the water column, at a density of 480 dec^-1 in four ponds under T₁. The side slopes of treatment ponds were not planted with bamboo and were kept a bamboo free border of approximately 100 cm widths. Stocking: The fingerlings of Labeo rohita were purchased from a local nursery. Then the ponds were stocked with of 40 fingerlings dec^-1. The mean weights were 22.81±2.92 and 22.93±3.21 g in T₁ and T₂, respectively. Pond Management: The ponds were monitored regularly, and cow manure, urea and T.S.P were applied at the rate of 357, 25 and 12.5 kg ha^-1respectively at 10 days interval. Since removal of enough bamboo trimmings were tough and disruptive to the trial pond's environment and fish, therefore, no sampling was conducted during the culture period. Only the ponds were observed closely for 5 minutes twice daily (morning and afternoon) for seeing of fish activity. Water quality monitoring: The water quality parameters were measured fortnightly within 00.90-12.00 hours except periphyton determination. Surface water temperature was recorded. Dissolved oxygen, pH and total alkalinity were measured in the four corners of each pond by Hach aquaculture test kit (FF-2). Water transparency was measured with Secchi disc in the corners of each pond throughout the study period. Harvesting and growth estimation of fish: The ponds were drained and harvested the fish after 168 days of stocking. The bulk weight of fish was taken and the average weight were measured with the help of a portable sensitive balance (HL 400 EXPERIMENT) graduated in a 0.01 g and recorded. Growth gained by the fishes was determined by subtracting the previous weight recorded at the time of stocking. Estimation of survival rate and yield of fish: The survival rates of fishes for each treatment were estimated on the basis on number of fish harvested at the end of the experiment. Then the gross yield of fish in each treatment was determined by multiplying the average gain in weight of fish and by the total numbers of fish survival in each treatment at the end of the experiment. Statistical analysis: Data obtained from the experiment were analyzed to determine the effects of different inputs and management practices applied in both the treatment. An independent t-test was performed to know difference regarding water quality parameters, growth and production of fish between the treatments. All statistical analyses were performed using Statistical Package for Social Sciences (windows version 11.5) and MS Excel.

Source of Information: J. Agrofor. Environ. 3 (1): 163-166, 2009; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Monoculture of Labeo rohita stocked at 1 m^-2 in regularly fertilized ponds without feeding, with and without bamboo trimmings as a substrate for periphyton resulted in financial benefit during 168 days trial. The addition of bamboo trimmings resulted significantly (P<0.05) higher growth performance of rohu and also the final production. Individual weight gain and production increased 2.54 and 2.49 folds, respectively for the bamboo trimmings treatment against the control without bamboo. The addition of bamboo trimmings traditionally practiced by farmers to deter theft provides a substrate for periphyton growth which promotes growth of rohu.

Knowledge Management: Journal