scholarly journals Phytoremediation Potential of Typha orientalis and Scirpus littoralis in Removal of Nitrogen and Phosphorus from Intensive Whiteleg Shrimp Wastewater

2018 ◽  
Vol 68 ◽  
pp. 04003
Author(s):  
Ngo Thuy Diem Trang ◽  
Lam Thi Nhu Mo ◽  
Vo Chi Linh ◽  
Hans Brix
Keyword(s):  
Rapid Development ◽  
Mekong Delta ◽  
Water Levels ◽  
Shrimp Farming ◽  
Growth Responses ◽  
Nitrogen And Phosphorus ◽  
Shrimp Culture ◽  
Waterlogged Condition ◽  
Typha Orientalis ◽  
Whiteleg Shrimp

The rapid development of whiteleg shrimp farming in the Mekong delta of Vietnam has an adverse impact on the environment due to large amount of nitrogen and phosphorus content in wastewater and pond sludge/sediment. Phytoremediation is a promising technique to use plant for mitigating environmental impacts from intensively whiteleg shrimp culture. Growth responses, nitrogen and phosphorus removal of Typha orientalis and Scirpus littoralis were assessed at three water levels of +15 cm, +30 cm and +45 cm. They were arranged in a completely randomized design with three replications. The plants were supplied wastewater from intensive whiteleg shrimp tanks once every two weeks. Waterlogged assessment was conducted for 71 days. Water levels significantly affected plant growth rate and nutrient removal capacity. S. littoralis grew well with a lower mortality rate and had no statistical reduction of biomass compared to T. orientalis at the highest water level of +45 cm. T. orientalis had the best perfromance in growth and biomass responses to waterlogged at water levels of +15 cm and +30 cm. The results indicated that S. littoralis was the best of choice to grow in waterlogged condition of the shrimp pond for maintaining water quality.

scholarly journals URAL EMPLOYMENTS IN THE MEKONG DELTA AND ITS RELATIONSHIP WITH URBAN AREAS IN THE SHIFT FROM RICE CULTIVATION TO SHRIMP FARMING

2011 ◽  
Vol 14 (3) ◽  
pp. 55-64
Author(s):  
Lan Thi Phuong Ngo
Keyword(s):  
Labor Migration ◽  
Urban Areas ◽  
Rapid Development ◽  
Mekong Delta ◽  
Shrimp Farming ◽  
Urban Migration ◽  
Rural And Urban Areas ◽  
Rural And Urban ◽  
Close Relationship ◽  
Rural Urban Migration

By analyzing dimensions of labor migration in the delta’s rice-to-shrimp communities, this paper suggests that in the present context, the relationship between rural and urban areas cannot be separately analyzed. In this paper, this close relationship is manifested in two aspects of rural employments and rural-urban migration. Those factors of excess labor, limited land, lack of employment, and uncertain conditions in agriculture production are important movitations of labor migration in the delta. Our findings are that having close proximity to industrial and urban areas remains an important drive of rural-urban migration. However, the rapid development of transportation and information which more and more connects rural and urban areas effectively has reduced geographical distance. Consequently, the organic relations between rural and industrial and urban areas have accelerated rural-urban migration. Moreover, rural-migration is also an indicator of unsustainability in agricultural production of the Mekong Delta.

Shrimp-mangrove integrated farming system in the Mekong Delta, Vietnam.

2020 ◽  
Author(s):  
Ngoc Hai Tran
Keyword(s):  
Central Government ◽  
Mekong Delta ◽  
Farming Systems ◽  
Buffer Zone ◽  
Farming System ◽  
Shrimp Farming ◽  
Shrimp Culture ◽  
System P ◽  
Blood Cockle ◽  
Aquaculture Production

Abstract The integrated shrimp-mangrove system is one of the most important farming systems in the Mekong Delta, especially in the buffer zone of Ca Mau province, Vietnam. According to Decision No. 116/1999/QD-TTg of the Vietnam Central Government, farms could use up to 40% of the total area of the buffer zone along the coast for aquaculture, with 60% reserved for mangrove plantation and environmental protection. Currently the mangrove-shrimp farming system in Ca Mau occupies a total area of 47,500 ha, of which ponds (ditches) cover about 19,000 ha. Shrimp culture is based mainly on improved extensive methods that give productivities in the range of 200-400 kg ha-1 yr-1. In addition to shrimps, several other species such as mud crab, fish, and blood cockle are also stocked to diversify aquaculture production and ensure regular incomes. With newly issued policies and regulations for shrimp-mangrove farming systems, new opportunities are being created for further improvement and development of the system.

Effects of nutrients and water levels on species composition in prairie whitetop (Scolochloa festucacea) marshes

1990 ◽  
Vol 68 (5) ◽  
pp. 1015-1020 ◽  
Author(s):  
Christopher Neill
Keyword(s):  
Seed Germination ◽  
Species Composition ◽  
Water Levels ◽  
Depth Range ◽  
Moist Soil ◽  
Growth Responses ◽  
Nitrogen And Phosphorus ◽  
Understory Species ◽  
Standing Water ◽  
Nutrient Additions

Nitrogen and phosphorus fertilizers were added over two growing seasons to whitetop marshes growing at the shallow and deep extremes of whitetop's water depth range in a northern prairie marsh to assess the effects of nutrient additions and water levels on species composition and understory species biomass. Nitrogen and nitrogen plus phosphorus additions reduced understory species biomass and caused only small changes in marsh species composition after 1 year, but dramatically decreased whitetop biomass and increased the biomass of the understory moist soil annual Atriplex patula at both water depths after 2 years. Phosphorus alone had little effect on species composition. Water levels influenced both the biomass of understory species and their potential response to nutrient additions. Biomass of understory species during both years was lower in deeper water. Nutrients had no effect on understory species biomass when standing water was present because standing water prevented seed germination. A mulching effect caused by greater whitetop litter accumulation and weaker whitetop stems associated with nitrogen fertilization appeared to be more important influences on understory species composition than differential understory species growth responses to added nutrients. Predicting responses of whitetop marshes to multiyear fertilization requires an understanding of the interactions between the physical conditions caused by increased biomass of whitetop, the relative abilities of understory moist soil species to grow under those conditions, and water levels, which control understory species seed germination and plant survival.

scholarly journals Dissimilarity of microbial diversity of pond water, shrimp intestine and sediment in Aquamimicry system

AMB Express ◽  
2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Shenzheng Zeng ◽  
Sukontorn Khoruamkid ◽  
Warinphorn Kongpakdee ◽  
Dongdong Wei ◽  
Lingfei Yu ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Well Being ◽  
Pacific White Shrimp ◽  
Shrimp Farming ◽  
Rrna Gene ◽  
Microbial Composition ◽  
Shrimp Culture ◽  
Water And Sediment ◽  
Surrounding Environment ◽  
Shrimp Production

Abstract The Pacific white shrimp, with the largest production in shrimp industry, has suffered from multiple severe viral and bacterial diseases, which calls for a more reliable and environmentally friendly system to promote shrimp culture. The “Aquamimicry system”, mimicking the nature of aquatic ecosystems for the well-being of aquatic animals, has effectively increased shrimp production and been adapted in many countries. However, the microbial communities in the shrimp intestine and surrounding environment that act as an essential component in Aquamimicry remain largely unknown. In this study, the microbial composition and diversity alteration in shrimp intestine, surrounding water and sediment at different culture stages were investigated by high throughput sequencing of 16S rRNA gene, obtaining 13,562 operational taxonomic units (OTUs). Results showed that the microbial communities in shrimp intestine and surrounding environment were significantly distinct from each other, and 23 distinguished taxa for each habitat were further characterized. The microbial communities differed significantly at different culture stages, confirmed by a great number of OTUs dramatically altered during the culture period. A small part of these altered OTUs were shared between shrimp intestine and surrounding environment, suggesting that the microbial alteration of intestine was not consistent with that of water and sediment. Regarding the high production of Aquamimicry farm used as a case in this study, the dissimilarity between intestinal and surrounding microbiota might be considered as a potential indicator for healthy status of shrimp farming, which provided hints on the appropriate culture practices to improve shrimp production.

scholarly journals Technical Efficiency and Output Losses in Shrimp Farming: A Case in Mekong Delta, Vietnam

Fishes ◽  
2021 ◽  
Vol 6 (4) ◽  
pp. 59
Author(s):  
Keo Sa Rate Thach ◽  
Hong Tu Vo ◽  
Ji-Yong Lee
Keyword(s):  
Technical Efficiency ◽  
Stochastic Frontier ◽  
Mekong Delta ◽  
Shrimp Farming ◽  
Primary Data ◽  
Traditional Group ◽  
Black Tiger Shrimp ◽  
Tiger Shrimp ◽  
Average Loss ◽  
Study Sites

The conversion from black tiger shrimp farming and crop farming to white leg shrimp production is widespread in Vietnam’s Mekong Delta provinces. However, this conversion trend also contains many risks related to the technical aspects of the production process. The study mainly aims to estimate the technical efficiency of white leg shrimp farming. It also compares the technical efficiency of white leg shrimp farming between the traditional group that historically has cultivated white leg shrimp and the group that recently converted from black tiger shrimp and crops to white leg shrimp, in order to evaluate the efficiency and adaptability of shrimp farming. Primary data were collected by directly interviewing 99 farmers in traditional areas and 101 farmers in recently converted areas in the study sites and analyzed by using the stochastic frontier method. The calculated technical efficiency was around 72.9 percent, suggesting that farmers could increase their output level by about 27.1%, given constant inputs. There was no difference in the technical efficiency of the two groups, indicating that the converted farms have sufficient adaptability when switching to white leg shrimp farming. The output loss in farmers’ production is still very high, with an average loss of 1973 kg/hectare.

scholarly journals Vannamei shrimp cultivation technology as an innovation of coastal land use in Rugemuk village Pulau Labu sub-district Deli Serdang district in 2019

2019 ◽  
Vol 4 (2) ◽  
pp. 232-236
Author(s):  
Irnawati Marsaulina ◽  
Harlem Marpaung
Keyword(s):  
Appropriate Technology ◽  
Shrimp Farming ◽  
Shrimp Culture ◽  
Long Run ◽  
Third Stage ◽  
Service Activity ◽  
Long Time ◽  
Coastal Land Use ◽  
Cultivation Technology ◽  
Shrimp Cultivation

This community service activity aims to increase the ability of fishermen and apply appropriate technology to cultivate Vannamei shrimp in a sustainable manner so that it will improve the welfare of fishermen's families. To achieve the objectives, several stages of activities are carried out, the first stage of the survey is to find out how the fish cultivator fishermen groups carry out their activities. The second stage is the socialization of activities that will be carried out to increase the ability to grow shrimp so that the results in a long time can increase the income (economy) of the fishermen. The third stage is to carry out coaching and counseling related to shrimp farming and can make decisions in the next economic field. This service program is carried out within 6 months. Program targets and outcomes (1). Increased knowledge and skills on appropriate technology in conducting Vannamei shrimp cultivation (2). Increased Vannamei shrimp yields by conducting shrimp culture training using tarpaulins. (3). In the long run, the results of aquaculture increase the economic welfare of the fishermen's family.

scholarly journals Marketplace Shrimp Mislabeling in North Carolina

2019 ◽  
Author(s):  
Morgan L. Korzik ◽  
Hannah M. Austin ◽  
Brittany Cooper ◽  
Caroline Jasperse ◽  
Grace Tan ◽  
...  
Keyword(s):  
North Carolina ◽  
Dna Barcoding ◽  
Health Risks ◽  
Shrimp Farming ◽  
Eastern Pacific ◽  
Species Identity ◽  
Wide Range ◽  
Seafood Products ◽  
Whiteleg Shrimp

AbstractSeafood mislabeling occurs in a wide range of seafood products worldwide, resulting in public distrust, economic fraud, and health risks for consumers. We quantified the extent of shrimp mislabeling in coastal and inland North Carolina. We used standard DNA barcoding procedures to determine the species identity of 106 shrimp sold by 60 vendors across North Carolina as “local” shrimp. Thirty-four percent of the purchased shrimp was mislabeled, and surprisingly the percentage did not differ significantly between coastal and inland counties. Roughly one third of product incorrectly marketed as “local” was in fact whiteleg shrimp: an imported, and very likely farmed, species from the eastern Pacific (and not found in North Carolina waters). In addition to the negative ecosystem consequences of shrimp farming (e.g., the loss of mangroves forests and the coastal buffering they provide) and seafood importation, North Carolina fishers—as with local fishers elsewhere—are negatively impacted when vendors label farmed, frozen, and imported shrimp as local, fresh, and wild-caught.

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