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Effects of Addition of Mola at Different Densities on Production of Giant Freshwater Prawn

R. Pervin
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. A. Wahab
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

K. Fatema
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. S. R. Khan
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

The effects of mola (Amblypharyngodon mola) at different densities in polyculture with freshwater prawn (Macrobrachium rosenbergii) were investigated at the Fisheries Field Laboratory, Bangladesh Agricultural University, Mymensingh. The experiment had three treatments, viz. prawn + 1 mola m^-2, prawn + 1.5 mola m^-2 and prawn + 2 mola m^-2 and were treated as T₁, T₂, and T₃, respectively with three replications in each. Prawn stocking density was same (3 juvenile m^-2) in all treatments. Feeds were applied twice daily for prawn. Assuming 80% survival, feeding rates were gradually reduced to 10-5% of body weight from the beginning to the last month. Water quality parameters (except transparency, chlorophyll-a) did not vary significantly (P>0.05). Weight gain, SGR (% body weight), gross and net production of prawn were not significantly different (P>0.05). Higher total production was recorded in T3 (574.61 ±39.58 kg ha^-1) followed by T_I (531.65±42.40 kg ha^-1) and T₂ (514.75±77.91 kg ha^-1). It was found that addition of mola at different densities had no effects on survival and production performance of prawn. Therefore, nutrient-dense mola may be stocked as an additional species with freshwater prawn. It might be concluded that treatment T₃ was better proposition for prawn-mola polyculture.

Keywords: Freshwater Prawn, Mola, Nutrient-dense, Polyculture

Location: Fisheries Field Laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 00-08-2010

End Date: 00-12-2010

Program Area: Animal Health and Management

Commodity: Prawn

Objectives:

This experiment was carried out to evaluate the effects of stocking density of mola on the growth, production and on pond ecology in prawn polyculture.

Methodology:

The experiment was conducted during August to December 2010 at the Fisheries Field Laboratory, Bangladesh Agricultural University, Mymensingh for a period of 120-days in 9 rectangular earthen ponds (6 pond of 100 m² each and 3 pond of 140 m² each) with an average depth of 1.2 m. The trial was conducted in a completely randomized design into three different treatments with three replications each. Stocking density of prawn (Macrobrachium rosenbergii) was same in all treatments but was different in case of mola. Unwanted fishes and other aquatic organisms were eradicated by rotenone application at the rate of 30 g dec^-1 ft^-1 (1 dec.= 40 m²). The dead fishes and other aquatic organisms were removed by repeated netting. After one week of rotenone application, quicklime (CaCO₃) at a rate of 250 kg ha^-1 was liquefied into an earthen pot and then applied by spreading homogenously in the ponds. The next day after liming, the ponds were filled with water from adjacent deep tube well. All ponds were fertilized with urea and triple super phosphate (TSP) at the rates of 50 kg ha^-1. The PL of Prawn (Macrobrachium rosenbergii) was purchased from a commercial hatchery in Fulpur village of Mymensingh district. Feeds were prepared using local pellet machine with following ingredients: Fish meal 15%, Mustard oil cake 20%, Soybean meal 20%, Rice bran 20%, Maize flour 20%, Molasses 4%, Vitamin-mineral premix 1%. Formulated feeds were applied at 10% body weight at 1st month (upto 30 days) and reduced to 7% at 2nd month and 5% up to the end of the experiment. Transparency, water temperature, pH and dissolved oxygen were measured every week at morning (10 am) and evening (4 pm). Ammonia-nitrogen, Nitratenitrogen, Phosphate-phosphorous and Chlorophyll-a were measured monthly. Sampling of fish weight by a digital electronic balance (Denver-XP-3000) was done monthly using a cast net to observe the growth of prawn and mola. For the statistical analysis of the data, one-way ANOVA (Analysis of Variance) was done by using the SPSS (Statistical Package for Social Science) version-11.5 Significance was assigned at the 0.05% level.

Source of Information: J. Bangladesh Agril. Univ. 10(1): 163–167, 2012 ISSN 1810-3030

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Growth and production performance showed that the highest gross and net production of prawn was recorded in T3. The combined gross and net production of prawn and mola was also highest in the same treatment. It might be concluded that there were no effects of addition of mola on prawn production, and T3 is the best proposition for prawn-mola polyculture, in which prawn can be cash crop and mola can be consumed at household levels.

Knowledge Management: Journal