Effects of including catla and tilapia in a freshwater prawn-mola polyculture in a rotational rice-fish culture systems (original) (raw)
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Aquaculture Research, 2008
The effects of different stocking densities of freshwater prawn (Macrobrachium rosenbergii) on its growth and production in relation to the presence of small self-recruiting species mola (Amblypharyngodon mola) were investigated in modified rice fields after rice harvest at Mymensingh, Bangladesh. Keeping the stocking density of mola fixed at 20 000 ha−1 in each treatment, four densities of freshwater prawn (treatments) were maintained: 10 000, 15 000, 20 000 and 25 000 ha−1 respectively. The rice plots were limed (CaCO3) and fertilized with urea, triple super phosphate and cowdung regularly. The prawns were fed daily with commercial pellets. Water quality parameters such as temperature, dissolved oxygen, transparency, pH, total alkalinity, inorganic nitrogen (nitrate, nitrite and total ammonia), chlorophyll a and orthophosphate were determined fortnightly. Numerical analysis of plankton communities was performed monthly. All water quality parameters were found to be within the suitable range for freshwater prawn culture, except high temperature, in the peak summer months. There was a homogenous abundance of plankton communities in all treatments throughout the experimental period. Mola started to breed in the second month of the original stocking with partial harvesting after the second month and continued until the final harvest. The total production of mola ranged between 124 and 152 kg ha−1 during the 4-month culture period. The average prawn survival ranged from 49% to 57% without any significant difference among treatments. Freshwater prawn production ranged from 294 to 596 kg ha−1 with significantly higher production in the treatment where 20 000 ha−1 freshwater prawn were stocked. This treatment also resulted in a higher net profit margin (74%), indicating that stocking at a combination of 20 000 ha−1 freshwater prawn and 20 000 ha−1 mola could be the optimum proposition for prawn–mola culture in modified rain-fed rice fields after rice cultivation.
International Conference on Advances in Science, Engineering, Technology and Natural Resources (ICASETNR-16) Nov. 24-25, 2016 Parys (South Africa), 2016
The research was conducted at Shahpur, Dumuria, Khulna to assess the effects of stocking densities on growth and yield of prawn (Macrobrachium rosenbergii) in rice fields with mola (Amblypharyngodon mola) from 2 August to 30 November, 2014 in 12 experimental rice plots. Each of four treatments with three replicates was tested in this experiment. In all treatments M. rosenbergii was stocked with A. mola. The stocking densities of M. rosenbergii were 10,000, 15,000, 20,000 and 25,000 individuals/ha in treatments T 1 , T 2 , T 3 and T 4 , respectively. The stocking density of A. mola was the same (20,000/ha) in all the treatments. In regards of the cultural suitability, the production of prawn and mola showed a higher growth with subsistence in T 2 , in which the stocking density of prawn was 15,000/ha and the mola was 20,000/ha. The highest production of prawn was recorded as 386.20±4.96 kg/ha, whereas the mola was 70.68±1.23 kg/ha in treatment T 2 than those of other treatments. The survival was the highest in T 2 (49.65%) followed by T 1 (44.25%) and T 4 (43.55%) and the lowest in T 3 (39.58%). Overall, the highest production and survival were obtained in T 2 and hence, it found to be more productive than the other treatments. The study therefore, established the fact that polyculture of freshwater prawn and mola is a better composition for rice-fish integration in Bangladesh.
Effects of prawn stocking density and feeding management on rice-prawn culture
The effects of prawn (Macrobrachium rosenbergii) stocking density and the use of commercial diet on rice-prawn culture were evaluated. The experimental design was completely randomized in a 2 × 2 factorial, with a control (rice monoculture, RM) and four replicates for each treatment. The treatments were: 2 prawns m −2 without feed (2W), 2 prawns m −2 with feed (2F), 5 prawns m −2 without feed (5W) and 5 prawns m −2 with feed (5F). Mean survival varied from 17.2 ± 9.3% (5F) to 39.2 ± 14.9% (2F), and mean weight from 20.3 ± 2.2 g (2W) to 25.7 ± 5.85 g (2F). Prawn productivity ranged between 118 ± 58 kg ha −1 (2W) and 224 ± 46 kg ha −1 (5W). No significant interactions were observed between feeding management and densities. Survival rate was significantly higher (P b 0.05) for the 2 prawn m −2 density while the other variables did not vary significantly among treatments. Rice yields were not statistically different among treatments and varied from 4608 ± 1225 kg ha −1 (2F) and 5620 ± 1202 kg ha −1 (RM). The results indicate that the rice-prawn system is technically feasible and does not need the addition of commercial diet. Economic analysis showed that stoking 5 prawns m −2 was not profitable. Total production costs and gross revenue were US$ 1337.84 and US$ 1182.07 for rice monoculture and US$ 2655.60 and US$ 2738.70 for the rice-prawn system (2 prawns m −2 ; without feed), respectively. Therefore, the integrated rice-prawn system is a suitable alternative to make rice production economically feasible on small farms without government subsidies.
Impact of rice–fish–prawn culture on rice-field ecology and productivity
Indian Journal of Agricultural Sciences
An on-farm experiment was carried out during 2005-07 to study the impact of fish and prawn rearing on ricefield ecology and productivity in rice-fish-prawn system. Water pH, total alkalinity, total suspended solid, plankton and chlorophyll-a were significantly lower in the rice mono crop than the rice-fish-prawn system, where supplemental feed was provided. However increased phytoplankton and chlorophyll-a concentration in the rice-fish-prawn system did not help in maintaining higher dissolved oxygen levels compared to rice mono-crop probably due to decreased autotrophic/ increased heterotrophic activity. Gut content analysis of the cultured species indicated plenty availability of planktonic, periphytic and benthic food to fish and prawn in the ricefield (22.7-48.9%), that reduce the supplemental feed input. Rice grain yield of 3.04 tonnes/ha in the rice-fish-prawn system was 16.9% higher than the rice mono-crop. In ricefish-prawn system, when 50% area is devoted for fish and prawn culture, the net return enhanced by 23-folds in comparison to rice monocrop. Significantly higher net return of Rs 79 585/ha, net water productivity of Rs 7.66/m 3 and the higher ratio of the output value to the cost of cultivation (1.6) in the rice-fish-prawn system infers that, rice-fishprawn culture is more beneficial can be adopted and expanded in lowland/ waterlogged areas.
International Journal of Fisheries and Aquatic Studies, 2021
To investigate the growth and production potentials of freshwater giant prawn (Macrobrachium rosenbergii) in polyculture with tiger shrimp (Penaeus monodon) and green back mullet (Chelon subviridis) a six month long experiment was conducted in six on-station ponds having an area of 0.1 ha each, with two replications in Brackish water station of Bangladesh Fisheries Research Institute. Overall stocking densities were different in three treatments. Stocking densities of shrimp and mullet were fixed in each treatment and that was 25,000 and 5,000 per hector respectively. Whereas, stocking density of prawn was maintained at 10,000, 15,000 and 20,000 per ha in T1, T2 and T3 respectively. After 90 days of culture final weight of shrimp was highest in T2 (30.77 g) while after 178 days of culture, final weights of prawn (64.73 g) and mullet (29.0 g) were highest in T1 than other treatments. Survival of shrimp (81.59%) and prawn (80.98%) was highest in T2 whereas, survival of mullet (97.67%) was highest in T1 than other treatments. Final weight (64.73 g) of prawn was found significantly (p<0.05) highest in T1 than other treatments. Total production was 1127.35, 1545.68 and 1449.92 kg/ha in T1, T2 and T3 respectively. Production of prawn (780.68 kg/ha) and total production (1545.68 kg/ha) were significantly (p<0.05) highest in T2 than other treatments which suggest that the stocking density of 15000/ha of prawn and combine stocking density of 45,000/ha of shrimp, prawn and mullet in polyculture would be suitable for coastal aquaculture.
Culture of freshwater prawn in rice fields was conducted with four farms. Hatchery reared postlarvae were used for stocking at density of 5 prawn/m 2 . Two-step culture was applied, that PL 15 were first nursed for one month in a netting compartment, then released to whole farm. Prawns were fed with pellets at a feeding rate of 30% body weight (BW) during the nursery step and 2-10% BW for grow-out step. The results of six culture months showed that the average prawn weight of 18.17±6.56 g to 30.2±4.6 g was achieved in four farms, and the productivity ranged from 222-566 kg/ha. Maturation of the female prawn was observed as early as at the third month of culture. Size ranking of the prawn and water quality of the farms were analyzed and discussed in the paper.
Int. J. Agril. Res. Innov. & Tech. 8 (2): 47-53
A six month’s experiment was carried out in earthen ponds to evaluate the effect of micro and macro nutrients on the growth performance of Prawn (Macrobrachium rosenbergii), Rohu (Labeo rohita) and Mola (Amblypharyngodon mola) in a polyculture system during July to December 2017. The trial was conducted into two different treatments and one control each with three replications. In treatment-1, macronutrients enrich fertilizers like urea, TSP and molasses-yeast mixture were applied at the rate of 2.45, 2.45, and 3.09 (g m-2 week-1), whereas in treatment-2 micronutrients composition mixer applied at the rate of 4.50 g m-2 week-1 while no micro and macronutrients were applied in control. The mean value of all water quality parameters showed no significant differences among control and two treatments when One-way ANOVA was performed except hardness. The average final mean individual weights of prawn, rohu and mola in control, treatment-1 and treatment-2 were 22.10, 24.35, and 24.70 g; 141.10, 190.60 and 182.20 g; 3.36, 3.67 and 3.73 g, respectively. The survival rates of various species namely prawn, rohu and mola in control, treatment-1 and treatment-2 were 73.33, 89.58 and 86.25%; 78.00, 74.00 and 74.00%; 10.67, 15.33 and 15.33%, respectively. There was no significant difference in the survival rates of prawn, rohu and mola among control and treatments. Production after six months of culture was 351.8, 461.5 and 445.3 kg ha-1 in control, treatment-1 and treatment-2, respectively which were significantly different at 5% level of significance.
Aquaculture Research, 2000
This study was conducted to evaluate the e¡ects of allmale, mixed-sex and all-female freshwater prawn (Macrobrachium rosenbergii) in a polyculture with major carps (Catla catla and Labeo rohita) and self-recruiting small ¢sh molas (Amblypharyngodon mola) in the fallow rice ¢elds of Bangladesh. There were three treatments with three replicates. All ponds were stocked with carps and molas plus either all-male prawns (treatment MP), mixed-sex prawns (MFP) or all-female prawns (FP). Prawn, mola, catla and rohu were stocked 20 000, 20 000, 1750 and 750 ha À 1 , respectively, in all treatments.The prawns were fed twice daily, starting at 8% body weight and gradually reduced to 3% body weight. The ¢sh were fed in the morning with mustard oil cake and rice bran (1:2 ratios) at 3% body weight. Signi¢cantly higher production of prawns (697 kg ha À 1) was obtained in treatment MP, which yielded 34.7% and 56.2% more production than MFP and FP respectively. Signi¢cantly higher total production of 1620 kg ha À 1 and a higher bene¢t^cost ratio of 2.10:1 were also obtained in treatment MP. It can be concluded that an all-male prawn culture is economically more viable than all-female and mixed-sex prawn cultures, along with other ¢sh like major carps and the nutrient-dense molas in the polyculture.