The effect of different stock densities on the performance of giant prawns (Macrobracium rosenbergii) and rice production in the minapadi system (original) (raw)
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Growth Giant Prawns (Macrobracium Rosenbergii) With Different Stock Densities On The Minapadi System
International Journal of Science, Technology & Management, 2021
Minapadi is a fish rearing system in rice fields that is carried out with rice plants. This study aims to increase the income of farmers with high productivity of rice yields and increase the production of giant prawns. The method used is a Completely Randomized Design (CRD) experiment with 3 treatments and 3 replications. The treatments were: P1 = stocking density of 100 birds/plot, P2 = stocking density of 200 birds/plot, P3 = stocking density of 300 birds/plot. This research was conducted for 90 days. Parameters observed were rice productivity and growth. The results showed that the best treatment was P2 = stocking density of 200 birds/plot. by producing an average value of rice productivity of 5 kg/50 m2 and an average value of growth of giant prawns of 4.72%.
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.
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.
Aquaculture Research, 2006
Postlarvae (PL) of Macrobrachium rosenbergii (de Man 1879) were stocked at 1, 2, 3 and 4 PL m À 2 . Prawns were fed only pellets (P) and a combination of pellets and snail meat (PS) with three replications in 100 m 2 plots in the rotational prawn^rice system.Water levels were 0.3^0.6 m in rice growing areas. The water temperatures at noon in the hot months were higher than the suitable range for prawns. The ¢nal mean weights of prawns in treatments 1, 2 and 3 PL m À 2 were signi-¢cantly higher than in treatment 4 PL m À 2 (Po0.05). The yields from di¡erent density treatments ranged from 194 AE 82 to 373 AE 32 kg ha À1 and increased signi¢cantly with the increases in prawn densities (Po0.05). There was no signi¢cant di¡erence between the two types of feed on production parameters (P40.05). The total cost signi¢cantly increased at higher densities (Po0.05), but it was not di¡erent between feed types (P40.05). Net pro¢t and cost bene¢t ratio of treatment PS were signi¢cantly higher than in treatment P. In the present study, treatment 3 PL m À 2 and treatment PS o¡ered the optimal results.
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.
Bangladesh Journal of Environmental Science
The research work was conducted to ascertain the recent status of moulting and growth performance of prawn by surveying four prawn farms with a brief questionnaire in Bagerhat region located in the east-southern part of Bangladesh. The data was collected in different times, firstly from April to May, secondly from June to July and finally from August to October during the culture period of prawn. Moulting of prawns is dependent upon different phenomenon or condition like water quality, seasonal effect and moulting cycle. In their lifetime prawn completes almost 11 life cycles but this research conducts the study of first 5 moulting cycles. Seasonal changes affect the water quality and prawn’s natural activity. Favorable conditions like rain, salinity, pH decreases and alkalinity, DO increases are suitable for growth of prawn and vice versa. Variation in growth was also found in different physico-chemical parameters and different density at different farms. Accordingly growth rate, specific growth rate (SGR), survibility rate and other growth parameters were calculated from first day to 120 days. It was observed that in spite of regular moulting processes prawn’s size variations though feeding rate and feeding frequency were same.
Research Journal of Fisheries and Hydrobiology, 2011
The growth performances of giant Malaysia prawn (Macrobrachium rosenbergii) in different compartments of an integrated culture system were evaluated during 12 weeks culture period. Macrobrachium rosenbergii were placed in tanks at about 150 individuals per tank. The experiment divided into five treatments and control tank with three replicates. Result on growth performance of M. rosenbergii shows the growth relative rate, final length and final weight differed significantly (p<0.05) between treatment. For the length-weight relationship, the growth coefficient (b) of M. rosenbergii was ranged between 2.37 to 3.38 at 95% confidence limit which concentration with 20 g recorded the higher value and the lower was recorded by the concentration of 40 g. The regression between length and weight showed a positive relationship which r 2 values ranged of 0.89 to 0.99. No significant difference (p>0.05) was observed during the study period on high, leaf width and weight of vegetables. In an integrated culture system, both Malaysian prawns and vegetables grow well in this system.
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.
Evaluation of freshwater prawn-small fish culture concurrently with rice in Bangladesh
Aquaculture Research, 2008
An integrated aquaculture of freshwater prawn (Macrobrachium rosenbergii) and self-recruiting small ¢sh mola (Amblypharyngodon mola) was conducted in farmers' rice ¢elds at Mymensingh, Bangladesh. There were four treatments with three replications. Four stocking densities, 10 000, 15000, 20 000 and 25000 ha À 1 , of freshwater prawn were applied. The stocking density of mola was the same (20 000 ha À 1) in all treatments. During land preparation, triple super phosphate (TSP) and murate of potash (MP) were applied at the rate of150 and 75 kg ha À 1 respectively. Urea was applied at the rate of 200 kg ha À 1 in equally distributed three installments after16,45 and 65 days of rice plantation. Prawns were fed with commercial pelleted feed at 3^8% body weight. All water quality parameters were found to be within the suitable range for freshwater prawn culture. There was a homogenous abundance of plankton communities in all treatments. The results of a 4-month culture period showed that the average production of prawn ranged from 222 to 388 kg ha À 1 , mola 51 to 68 kg ha À 1 and rice 2880 to 3710 kg ha À 1. Signi¢cantly higher production of both prawn and mola was recorded in the plots where the freshwater prawn stocking density was 15000 ha À 1. This treatment resulted in a net pro¢t of USD 1100 ha À 1 .