Eco-technological analysis of fish farming households in the Mekong Delta of Vietnam.

Pekàr, Ferenc; Be, Norris; Long, Duong Nhut; Công, Nguyễn Văn; Dung, DV; Oláh, Judit; Edwards, P.; Little, David C.; Demaine, Harvey

doi:10.1079/9780851995656.0077

Cited by 6 publications

(5 citation statements)

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“…In developing countries, farmers often use small aquaculture ponds as part of an integrated subsistence system. In Vietnam, fish are raised on agricultural waste products such as rice hulls; this practice is also used in the Philippines (Pekar et al 2002;Prein et al 2002). Cage aquaculture is also employed in the lakes and rivers of Indonesia (Munzir and Heidhues 2002) and China (Lu 1992).…”

Section: Socioeconomic Effectsmentioning

confidence: 99%

Potential impacts of global climate change on freshwater fisheries

Ficke

Myrick

Hansen

2007

Rev Fish Biol Fisheries

956

642

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Despite uncertainty in all levels of analysis, recent and long-term changes in our climate point to the distinct possibility that greenhouse gas emissions have altered mean annual temperatures, precipitation and weather patterns. Modeling efforts that use doubled atmospheric CO 2 scenarios predict a 1-78C mean global temperature increase, regional changes in precipitation patterns and storm tracks, and the possibility of ''surprises'' or sudden irreversible regime shifts. The general effects of climate change on freshwater systems will likely be increased water temperatures, decreased dissolved oxygen levels, and the increased toxicity of pollutants. In lotic systems, altered hydrologic regimes and increased groundwater temperatures could affect the quality of fish habitat. In lentic systems, eutrophication may be exacerbated or offset, and stratification will likely become more pronounced and stronger. This could alter food webs and change habitat availability and quality. Fish physiology is inextricably linked to temperature, and fish have evolved to cope with specific hydrologic regimes and habitat niches. Therefore, their physiology and life histories will be affected by alterations induced by climate change. Fish communities may change as range shifts will likely occur on a species level, not a community level; this will add novel biotic pressures to aquatic communities. Genetic change is also possible and is the only biological option for fish that are unable to migrate or acclimate. Endemic species, species in fragmented habitats, or those in east-west oriented systems will be less able to follow changing thermal isolines over time. Artisanal, commercial, and recreational fisheries worldwide depend upon freshwater fishes. Impacted fisheries may make it difficult for developing countries to meet their food demand, and developed countries may experience economic losses. As it strengthens over time, global climate change will become a more powerful stressor for fish living in natural or artificial systems. Furthermore, human response to climate change (e.g., increased water diversion) will exacerbate its already-detrimental effects.Model predictions indicate that global climate change will continue even if greenhouse gas emissions decrease or cease. Therefore, proactive management strategies such as removing other stressors from natural systems will be necessary to sustain our freshwater fisheries.

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Section: Socioeconomic Effectsmentioning

confidence: 99%

Potential impacts of global climate change on freshwater fisheries

Ficke

Myrick

Hansen

2007

Rev Fish Biol Fisheries

956

642

View full text Add to dashboard Cite

show abstract

“…In the Mekong delta, IAA farming was very recently introduced and is still adjusting (Pekar, Be, Long, Cong, Dung & Olah 2002; Bosma, Udo, Verreth, Visser & Nam 2005). Integrated agriculture–aquaculture farming was promoted by the government, who recognized the potential benefits of IAA farming for the resource‐poor.…”

Section: Introductionmentioning

confidence: 99%

Water and nutrient budgets of ponds in integrated agriculture-aquaculture systems in the Mekong Delta, Vietnam

Nhan

Verdegem

Milstein³

et al. 2008

Aquaculture Research

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A participatory on‐farm study analysed water and nutrient budgets of six low and four high water‐exchange ponds of integrated agriculture–aquaculture (IAA) farms in the Mekong delta. Water, nitrogen (N), organic carbon (OC) and phosphorus (P) flows through the ponds were monitored, and data on fish production and nutrient accumulation in sediments were collected during a fish culture cycle. Results showed that, on average, only 5–6% of total N, OC or P inputs introduced into ponds were recovered in the harvested fish. About 29% N, 81% OC and 51% P accumulated in the sediments. The remaining fractions were lost through pond water discharges into adjacent canals. Fish yields and nutrient accumulation rates in the sediments increased with increasing food inputs applied to the pond at the cost of increased nutrient discharges. High water‐exchange ponds received two to three times more on‐farm nutrients (N, OC and P) while requiring nine times more water and discharging 10–14 times more nutrients than the low water‐exchange ponds. Water and nutrient flows between the pond and the other IAA‐farm components need to be considered when optimizing productivity and profitability from IAA systems.

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“…According to Islam (1986) some fish farmers have basic information regarding pond aquaculture but they have no scientific knowledge about technologies. Pekar et al (2002) mentioned that better knowledge of functioning of aquaculture ecosystems would help to improve the management of culture sustain high pond productivity.…”

Section: Marketing Problemsmentioning

confidence: 99%

Constraints and prospects of carp production in Rajshahi and Natore districts, Bangladesh

Mohsin

Islam

Hossain

et al. 2013

Univ. j. zool. Rajshahi Univ.

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: This study was conducted in Rajshahi and Natore districts of northern area of Bangladesh for a period of three years (2007 to 2009). One hundred carp ponds were selected randomly and fish farmers were interviewed to reveal the existing constraints and prospects. Ten percent farmers reported multiple ownership as a problem and 16% farmers stated that lease value of pond is too high which reducing their profit level. Lack of quality fish seeds was reported by 33% farmers which results in low growth and high mortality of fishes. Nine percent carp farmers reported that inorganic fertilizers were not giving expected performances. Thirty three percent carp farmers failed to apply required inputs in due time due to lack of sufficient credit. Plankton bloom was recorded in 18% ponds. Three percent fish farmers were found to be affected by flood and drought. Eight percent farmers reported non-severe attack of disease. Fish poaching and poisoning were revealed as major constraints. Thirty six percent farmers mentioned lack of technical supports. Due to found constraints, the farmers failed to use inputs and experiences properly resulted in unsatisfactory fish production (3598.72±785.83 kg/ha/yr) to the carp farmers. Further research efforts are recommended to assess the specific impacts of recorded constraints on fish production.

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Eco-technological analysis of fish farming households in the Mekong Delta of Vietnam.

Cited by 6 publications

References 0 publications

Potential impacts of global climate change on freshwater fisheries

Potential impacts of global climate change on freshwater fisheries

Water and nutrient budgets of ponds in integrated agriculture-aquaculture systems in the Mekong Delta, Vietnam

Constraints and prospects of carp production in Rajshahi and Natore districts, Bangladesh

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