Overall effect of rice biomass and fish on the aquatic ecology of experimental rice plots

Vromant, Nico; Chau, Nguyen Thi Hoai

doi:10.1016/j.agee.2005.06.015

Cited by 30 publications

(15 citation statements)

References 41 publications

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“…Such an effect was also observed in previous studies on rice-fish ecology, e.g. Vromont and Chau, [15]. As with chlorophyll-a water, nitrogen and phosphorous concentrations tended to be elevated in the T 1 , T 2 and T 3 compared to T 4 .…”

Section: A Water Quality Parameterssupporting

confidence: 66%

“…The values of water quality parameters from the rice fields under different treatments are shown in [6,14,15]. The DO levels of water ranged from 4.83 to 5.41 mg/l are similar to the values of 3.6 to 8.7 mg/l in rice fields as reported by Frei and Backer [6].…”

Section: A Water Quality Parameterssupporting

confidence: 55%

“…As with chlorophyll-a water, nitrogen and phosphorous concentrations tended to be elevated in the T 1 , T 2 and T 3 compared to T 4 . This may either be due to mineralization and diffusion of soil nutrients [15] or excretion of unutilized feed nutrients by fish. …”

Section: A Water Quality Parametersmentioning

confidence: 99%

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Effect of different stocking densities on the gross production and economic yields of prawn (Macrobrachium rosenbergii) with mola (Amblypharyngodon mola) fish in rice fields

2017

IJACEBS

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Abstract-A field experiment was conducted at Shahpur, Dumuria, Khulna to evaluate the effects of stocking densities on the gross production and economic yields of prawn (Macrobrachium rosenbergii) in rice fields with mola (Amblypharyngodon mola) from 2 August to 30 November, 2014 in 12 experimental rice plots (ghers). Each of four treatments with three replicates was tested in this trial. 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 T1, T2, T3 and T4, respectively. The stocking density of A. mola was the same (20,000 individuals/ha) in all the treatments. The mean values of water quality parameters viz., temperature, dissolved oxygen (DO), pH, alkalinity, ammonia, nitrate-nitrogen and phosphate-phosphorus were within the suitable range for fish culture. All rice plots were fertilized with urea (200 kg/ha), TSP (150 kg/ha) and MP (75 kg/ha). At harvesting, prawn and mola in T2 showed higher growth performances where the stocking densities were 15,000 and 20,000 individual/ha, respectively. The survival was the highest in T2 (49.65%) followed by T1 (44.25%) and T4 (43.55%) and the lowest in T3 (39.58%). The highest production of prawn was recorded as 386.20 kg/ha (economic values of which was BDT 386200), whereas the mola was 70.68 kg/ha (with the economic value of BDT 10,602) in treatment T2 than those of other treatments. In case of rice production, comparatively high economic returns (BDT 77,200 from rice and BDT 5,085 from straw) were obtained in T2 than those in other treatments. The highest net-benefit (BDT/ha) was obtained in T2 (309,487), followed by T1 (201,754) and T3 (164,841) and the lowest in T4 (108,308). The benefits-cost ratio (BCR) was also higher in T2 (2.82) than those in T1 (2.59), T3 (1.69) and T4 (1.36), respectively. With respect to growth, production, benefits and BCR, it is indicated t h a t t h e cu l t u r e of M . r o s en b er g i i i n comb i n a t i on wi t h A. mo l a a t s t ock i n g d e n s i t i e s of 15,000/ha and 20,000/ha, respectively were more profitable than those obtained from other stocking densities. The study therefore, established the fact that polyculture of freshwater prawn and mola is a better composition for rice-fish culture in Bangladesh.

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Section: A Water Quality Parameterssupporting

confidence: 66%

Section: A Water Quality Parameterssupporting

confidence: 55%

See 1 more Smart Citation

Effect of different stocking densities on the gross production and economic yields of prawn (Macrobrachium rosenbergii) with mola (Amblypharyngodon mola) fish in rice fields

2017

IJACEBS

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“…Moreover, in all of these studies, the hypothesis was not supported by statistically significant results [12][13][14][15][16][17][18][19][20][21][22][23][24]. Furthermore, the ecological processes leading to higher rice yield in rice-fish culture were not demonstrated (but see [25]). …”

Section: Introductionmentioning

confidence: 78%

“…The fish in paddy fields increase the soil nutrient status [49], while uptake of nitrogen by rice plants in rice-fish culture was higher than that in rice monoculture [50,51]. The floodwater and soil interstitial water patterns of nutrient fluxes are also very similar because the rice field floodwater and the soil form a continuum [25], although only nutrient concentrations in the floodwater were investigated in the present study. Therefore, the fertilizing effect from the fish excrement probably increased rice yield in this study.…”

Section: Discussionmentioning

confidence: 96%

Effect of fish in rice-fish culture on the rice yield

et al. 2010

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Rice-fish culture, which means the simultaneous culture of rice and fish, is one of the best options to increase food production from limited land and is practiced in many countries in the world. Although many researchers and farmers believe that the rice yield is increased by fish farming in paddy fields, this hypothesis has never been fully tested. Here, we report ecological processes leading to higher rice yields in the rice-fish culture using crucian carp (Carassius complex), which have adapted to the paddy field ecosystem in Japan. We compare the rice-fish and rice-only plots in the experimental paddy field for biota, water quality, and rice yield. Coverage of duckweed and densities of zooplankton and benthic invertebrates in the rice-fish plots were lower than those in the rice-only plots, indicating that fish utilized them as food. NO 3 -N concentration in the rice-fish plots was higher than that in the rice-only plots, indicating that the increase in NO 3 -N concentration results from excretion of unutilized food nutrients by the fish. Consequently, rice yield in the ricefish plots was 20% higher than that in the rice-only plots. The fertilizing effect of the fish excrement probably increased rice yield.

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Rice paddy irrigation seasonally impacts stream benthic macroinvertebrate diversity at the catchment level

Asano

Lin

et al. 2021

Ecosphere

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Agriculture is one of the most critical anthropogenic disturbances to freshwater ecosystems globally.In monsoon Asia, rice paddies provide habitats for aquatic species, but how their associated irrigation systems can affect downstream ecosystems is poorly understood. Here, we used structural equation modeling (SEM) to estimate seasonal variations in benthic macroinvertebrate diversity and environments and quantified indirect effects of land use, especially of rice paddy areas, on benthic macroinvertebrate diversity through local environmental alteration. Our study site was the Yasu River tributary of Lake Biwa, Japan, and we performed our investigation during both irrigation and nonirrigation periods, representing different seasons. Seasonal variations in physical and chemical variables and diversity were observed. Seasonal particulate phosphorus concentrations to a large extent determined the abundance and community composition of benthic macroinvertebrates. SEM revealed that the proportions of forest, urban, and rice paddy areas in the catchment had significant indirect effects on biodiversity indices of local benthic macroinvertebrate communities. The proportion of forest area had robust negative effects on water temperature, but the overall indirect effects on the macroinvertebrate diversity contrasted between the two seasonal periods. The proportion of rice paddy area had a strongly negative indirect effect on the diversity through increased particulate phosphorous loading during the irrigation period, while the proportion of urban area had a significantly negative indirect effect during the nonirrigation period only. The seasonal negative impacts of rice paddy irrigation on benthic macroinvertebrate communities were possibly due to siltation arising from rice paddy soils. Our results have implications for environmental restoration and biodiversity conservation in catchment management.

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Overall effect of rice biomass and fish on the aquatic ecology of experimental rice plots

Cited by 30 publications

References 41 publications

Effect of different stocking densities on the gross production and economic yields of prawn (Macrobrachium rosenbergii) with mola (Amblypharyngodon mola) fish in rice fields

Effect of different stocking densities on the gross production and economic yields of prawn (Macrobrachium rosenbergii) with mola (Amblypharyngodon mola) fish in rice fields

Effect of fish in rice-fish culture on the rice yield

Rice paddy irrigation seasonally impacts stream benthic macroinvertebrate diversity at the catchment level

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