Improved Sustainable Aquaculture Systems for Small-Scale Farmers in Northern Vietnam

Pucher, Johannes; Steinbronn, Silke; Mayrhofer, Richard; Schad, Iven; El‐Matbouli, Mansour; Focken, Ulfert

doi:10.1007/978-3-642-33377-4_8

Cited by 16 publications

(25 citation statements)

References 67 publications

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“…Traditional aquaculture in this region results in rather poor fish yields (e.g. 1.5 tons ha -1 year -1 in Yen Chau District as reported by Steinbronn 2009 andPucher et al 2013). The production is limited by loss of pond productivity due to high turbidity in the ponds caused by the constant inflow of particles eroded from surrounding intensive agriculture.…”

Section: Introductionmentioning

confidence: 80%

“…The production is limited by loss of pond productivity due to high turbidity in the ponds caused by the constant inflow of particles eroded from surrounding intensive agriculture. Further, the production of grass carp, as the dominant species stocked in traditionally managed ponds, is endangered by the occurrence of a species-specific disease that causes mass mortalities of grass carp in Northern Vietnam (Edwards 2000;Steinbronn 2009;Pucher et al 2013) which may be linked with feeding fish with pesticide-contaminated leaf material from the fields (Steinbronn 2009;Pucher et al 2014c). To improve regional aquaculture production, modifications of the traditional pond management towards a more semi-intensive pond management were designed by researchers and introduced to farmers in the Yen Chau District, Son La Province, Northern Vietnam.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the disease-prone grass carp were replaced as the main species by common carp and supplemental feeding of pellets based on locally available ingredients was applied. The traditional and modified pond management systems and their effect on limnological parameters, natural food availability, fish production, utilization of applied nutrients (in feeds and fertilizers), and financial net benefit are described in more detail by Steinbronn (2009) and Pucher et al (2013, 2014a, b, 2016. However, it could not be shown yet to what extent natural food resources originating from primary production in the pond support the growth of the different fish species stocked under the two management schemes or whether the pond management affects the utilization of natural food resources.…”

Section: Introductionmentioning

confidence: 99%

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Uptake of nitrogen from natural food into fish in differently managed polyculture ponds using 15N as tracer

Pucher

Focken²

2016

Aquacult Int

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Food security in Asia depends significantly on small-scale pond aquaculture in which fish feed on external feeds and natural food resources. Little is known about the assimilation of natural food resources into fish. In order to elucidate the food web and nitrogen flows in a traditionally and a semi-intensively managed pond in Vietnam, d 13 C and d 15 N in pond inputs and fish were measured before and after the application of inorganic 15 N at 1.1 and 0.4 % of total nitrogen. The applied 15 N was traced through the biomass of stocked fish over 30 days. Under traditional management, grass carp was the dominant species in number and biomass. After 30 days, grass carp assimilated 1.2 % of the applied tracer through natural food resources. Filter feeders assimilated only 0.1-0.3 % of the tracer after 30 days because of the limited productivity in the traditionally managed pond. Nile tilapia showed the highest uptake rates over the 30 days, which demonstrated their ability to feed on a variety of natural food resources. In total, 2.6 % of the applied 15 N was assimilated into fish biomass after 30 days. Under semi-intensive management, common carp was the main species numerically and assimilated 1.8 % of the tracer after 30 days. Grass carp was stocked at lower density, but had the highest biomass by the time of the experiment. Grass carp assimilated 0.2 % of the applied tracer suggesting a low contribution of natural food resources to its nutrition. Silver carp benefited most from the higher natural food resources. In total, 4.1 % of applied 15 N was assimilated into fish biomass after 30 days. Traditional small-scale aquaculture of a grass carp-dominated polyculture has a lower assimilation efficiency of applied fertilizers into fish biomass than a common carp-dominated polyculture under semi-intensive management.

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Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Uptake of nitrogen from natural food into fish in differently managed polyculture ponds using 15N as tracer

Pucher

Focken²

2016

Aquacult Int

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“…Such has been the case with aquaculture and rice farming in the Mekong Delta (Vietnam) (Pucher et al, 2013). Furthermore, despite clear advantages for adapting rice to climate change, the use of modern varieties with high tolerance to abiotic stresses such as submergence (Jagadish et al, 2012) also draws responsibilities for habitat management as marginal areas that were once a refuge for wildlife become more feasible for rice production.…”

Section: Increasing Areas Of Productionmentioning

confidence: 99%

Integrated pest management for sustainable rice cultivation: a holistic approach

Horgan¹

2017

Burleigh Dodds Series in Agricultural Science

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“…Indeed, the burst of optimal and sustainable fish farming must necessarily use a dynamic resource available such as organic fertilizers (FAO 2012). Thus, organic fertilizer use is a suitable alternative for agricultural activities to improve fish productivity and yields (Pucher et al 2012;Bokossa et al 2014a). Steinbronn (2009) showed that aquaculture production contributes significantly to food security, generates income, and plays a significant role in farmers' livelihood strategies.…”

Section: Introductionmentioning

confidence: 99%

Valorization of various sources of rabbit manure in agro-piscicultural system in Benin (West Africa): dynamics and effect of mineralization upon quality of fresh water

Adande

Bokossa

Liady

et al. 2017

Int J Recycl Org Waste Agricult

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Purpose Rising demand of fish generates various pressures on aquatic ecosystems, causing its deterioration and the loss of its biodiversity. With the aim of a better management and fish production in a salubrious environment, this study proposes the utilization of organic fertilizers from rabbit manure. Methods The treatments consisted of manure of rabbits fed with: manufactured diet (T 1 ), improved diet with Ipomea aquatic (T 2 ), improved diet with Elaeis guineensis (T 3 ), and improved diet with Panicum maximum (T 4 ). Indeed, experimental design was a completely randomized block design with three replications. 6 g in 10 L of water from the different manures from each diet was followed during 50 days. Various nutrients were measured. Results After the mineralization process, the best manure which released more nutrients was T 4 with measured proportions of N-NO 2 -, N-NO 3 -, N-NH 3 , P-PO 4 3-, Ca 2? , Mg 2? , K ? , and suspended matter being 0.06 ± 0.0, 0.38 ± 0.1, 0.85 ± 0.1, 8.27 ± 0.9, 12.11 ± 0.8, 4.47 ± 0.3, 3.02 ± 0.2, and 140.78 ± 18.6 mg/L, respectively. The highest content of phosphorus and nitrogen was recorded in T 4 and T 2 , respectively. The principal component analysis showed a positive correlation between P-PO 4 3-, Ca 2? , Mg 2? , MES, conductivity, and salinity during mineralization.Conclusion Manure from rabbits fed by an improved diet with P. maximum (T 4 ) was recommended for agro-piscicultural production system.

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Improved Sustainable Aquaculture Systems for Small-Scale Farmers in Northern Vietnam

Cited by 16 publications

References 67 publications

Uptake of nitrogen from natural food into fish in differently managed polyculture ponds using 15N as tracer

Uptake of nitrogen from natural food into fish in differently managed polyculture ponds using 15N as tracer

Integrated pest management for sustainable rice cultivation: a holistic approach

Valorization of various sources of rabbit manure in agro-piscicultural system in Benin (West Africa): dynamics and effect of mineralization upon quality of fresh water

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