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Han Y.N.,China Agricultural University | Kong W.M.,Beijingphenomena of nature to create Ltd | Nhan L.V.,Research Institute For Aquaculture No1 | Rui Y.K.,China Agricultural University
Applied Mechanics and Materials | Year: 2014

Environment has become one of the major issues of society, and how to use existing resources to serve in the community is a major development in future issues. The new building is not only to protect human health and enhance comfort; use logically and effectively energy and resources, reduce pollution and is one of methods to make environment get out of crisis. In this paper, in order to reduce pollution emissions of building, developing the new eco-building, look forward to the rational application of resources, namely the construction method of straw to straw as raw materials of modular housing. This paper introduced in details about the benefits of house and the trends of housing development in the future. © (2014) Trans Tech Publications, Switzerland.

Clausen J.H.,Copenhagen University | Madsen H.,Copenhagen University | Murrell K.D.,Copenhagen University | Van P.T.,Research Institute For Aquaculture No1 | And 5 more authors.
Emerging Infectious Diseases | Year: 2012

Worldwide, >18 million persons were infected with fish-borne zoonotic trematodes in 2002. To evaluate the effectiveness of interventions for reducing prevalence and intensity of fish-borne zoonotic trematode infections in juvenile fish, we compared transmission rates at nurseries in the Red River Delta, northern Vietnam. Rates were significantly lower for nurseries that reduced snail populations and trematode egg contamination in ponds than for nurseries that did not. These interventions can be used in the development of programs for sustained control of zoonotic trematodes in farmed fish.

Bui T.N.,Research Institute For Aquaculture No1 | Pham T.T.,Research Institute For Aquaculture No1 | Nguyen N.T.,Research Institute For Aquaculture No1 | Nguyen H.V.,Vietnam Academy of Science and Technology | And 2 more authors.
Parasitology Research | Year: 2016

Preliminary findings of a high prevalence of Clonorchis sinensis in wild-caught fish in a North Vietnam reservoir (Thac Ba reservoir, Yen Bai Province) prompted a longitudinal epidemiological study of fish infections. Monthly collections of fish from September 2014 to August 2015 were processed for recovery of metacercariae; 1219 fish, representing 22 species, were examined. Seven species were infected with C. sinensis metacercariae. Four species, Toxabramis houdemeri, Hemiculter leucisculus, Cultrichthys erythropterus, and Culter recurvirostris, had high prevalence (31.1 to 76.7 %); metacercarial intensities ranged from 3.9 to 65.7 metacercariae/fish. A seasonal variation of C. sinensis prevalence was observed in T. houdemeri. Variation in intensity of infection occurred in C. erythropterus and H. leucisculus. Intensity and prevalence of C. sinensis in the most highly infected species, T. houdemeri, varied by fish size; prevalence was higher in fish weighing more than 3 g, and intensity was higher in fish weighing more than 5 g. The distribution of metacercariae in the body region of T. houdemeri was significantly higher in the caudal fin (14.7 metacercariae/g), compared to the body and head regions (0.7 and 1.4 metacercariae/g, respectively). Further epidemiological investigations on C. sinensis in this reservoir region should include assessing the relative risk of the different fish species for humans based on the latter’s food preferences, and the prevalence of C. sinensis in the community. The snail intermediate host(s) in the reservoir should also be identified along with the ecological factors influencing its exposure to C. sinensis eggs and its subsequent transmission of cercariae to fish. Also needed are investigations on the relative importance of wild and domestic reservoir hosts as sources of egg contamination of the reservoir. © 2016 Springer-Verlag Berlin Heidelberg

Mai H.,Research Institute For Aquaculture No1 | Fotedar R.,Curtin University Australia | Fewtrell J.,Curtin University Australia
Aquaculture | Year: 2010

Effluent water from intensive prawn aquaculture systems typically has a high concentration of dissolved nutrients such as nitrogen and phosphorus. A study was conducted for 42days to investigate the nutrient flow in a system where brown seaweed (Sargassum sp.) was integrated into western king prawn (Penaeus latisulcatus) culture. Three treatments namely, western king prawn monoculture (5.48±0.29g), Sargassum sp. monoculture and seaweed/prawn integrated culture were tested for nutrient flow among feed, water and species cultured. The results showed that by integrating seaweed into prawn culture, the concentrations of total ammonium nitrogen (TAN), nitrite-nitrogen (NO2 -) and nitrate-nitrogen (NO3 -), dissolved inorganic nitrogen (DIN), total nitrogen (TN), phosphate (PO4 3-) and total phosphorus (TP) were significantly lower (p<0.05) in the integrated culture system than in the prawn monoculture (p<0.05) and remained within non-toxic limits for the duration of the study. In addition, the integration of Sargassum sp. with western king prawn culture did not significantly alter the nitrogen and phosphorus conversion rates from feed into prawns (approximately 17.69-18.99 and 13.79-14.47%, respectively). The specific growth rate (SGR) and survival rate of the prawns in integrated treatment did not significantly differ (p>0.05) from the prawn monoculture. The mean biomass of Sargassum sp. in integrated culture increased at the rate of 3.16±0.74% g day-1 after 7days of the study, which was significantly higher than in the monoculture system (5.70±0.82% g day-1). The results suggest that integrating Sargassum sp. into western king prawn culture can benefit prawn farming by assisting in the maintenance of optimum water quality and thereby, reducing environmental impacts on surrounding areas. © 2010.

Nhu V.C.,Ghent University | Dierckens K.,Ghent University | Nguyen H.T.,Research Institute For Aquaculture No1 | Hoang T.M.T.,Vinh University | And 4 more authors.
Aquaculture | Year: 2010

Cobia (Rachycentron canadum) is a very fast growing species. This can only be achieved if sufficient amounts of feed are provided from early larval development onwards. In this study, we examined the effects of early co-feeding and different co-feeding formulated diets on growth, survival and vitality of cobia larvae and juveniles. Two experiments were conducted to test the possibility of early co-feeding of the two formulated diets for cobia larvae (8-18 dph) and one experiment was conducted to compare the effect of three formulated diets for cobia juveniles (20-38 dph). During the larval stage, two formulated diets: Proton ® and an experimental diet (INVE, Belgium) were used along with live food from eight days post hatch (dph) and 13dph compared to 18dph as the control. Results from the study indicated that early co-feeding of Proton ® from eight dph had a significantly positive effect on growth (P<0.05), but not on survival and stress resistance in a salinity stress test (P>0.05) of cobia larvae. In the second trial, no significant difference (P>0.05) was detected between all treatments in terms of growth, vitality and survival. However, high mortality occurred in the treatment with the experimental diet as of 12dph. The study suggested that early co-feeding of Proton ® to cobia larvae from eight dph is possible and research on the appropriate nutritional composition of weaning diets needs to be addressed. In the juvenile stage, three formulated diets, i.e. the experimental diet, Proton ® and NRD ® (INVE Aquaculture NV) were evaluated for growth performance and survival of early cobia juveniles (20-38dph). The diets were manually introduced from 22dph at a feeding frequency of every 2h until satiation, while feeding of enriched EG Artemia was maintained until 30dph. Average length and weight of the 38-dph juveniles fed the experimental diet were significantly higher (P<0.05) compared to larvae fed Proton ® and NRD ®. However, the coefficient of size variation as well as the cumulative stress index in a salinity challenge test was not significantly different (P>0.05). Survival in the Proton ® treatment was the lowest, while no significant difference was evident between the experimental diet and NRD ® treatments. The mortality rate of all three treatments had two peaks: one at the beginning of the experiment and one when live food feeding was discontinued. This result indicates that the nutritional requirements of cobia are age-dependent and prolongation of live food co-feeding during weaning may be necessary. The higher DHA/EPA ratio in the experimental diet can be a clue for the improvement of growth and survival of cobia during the weaning stage. © 2010 Elsevier B.V.

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