Research Institute For Aquaculture No 1

Vietnam

Research Institute For Aquaculture No 1

Vietnam

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Endruweit M.,University of Chinese Academy of Sciences | Endruweit M.,CAS Kunming Institute of Zoology | Nguyen T.D.P.,Research Institute For Aquaculture No 1
Ichthyological Exploration of Freshwaters | Year: 2016

Sewellia hypsicrateae, new species, is described from the Dakrong River, Quang Tri Province, Vietnam, extending the distributional range of the genus further northward. It is distinguished from its congeners by having a deep (11-13 % SL) and stout caudal peduncle (its depth 1.5-1.8 times in its length); 68-72 lateral line scales; and by the presence of an oropectoral skin-fold. Further characters of S. hypsicrateae are a modal transverse scale count of 1/27/I/71/2 on the caudal peduncle; 22-23 branched pectoral-fin rays; pelvic fin reaching anus; the presence of hypertrophied lepidotrichia on the pelvic-fin rays; and a uniform dark brown flank coloration. © 2016 by Verlag Dr. Friedrich Pfeil, München, Germany.


Cuong D.B.,Hanoi University of Science and Technology | Dung V.K.,Hanoi University | Hien N.T.T.,Research Institute for Aquaculture No 1 | Thu D.T.,Hanoi University of Science and Technology
Journal of Aquaculture Research and Development | Year: 2013

β-Mannooligosaccharides, produced by partial enzymatic hydrolysis of copra pulp residues using recombinant A. niger β-mannanase, were evaluated for its potential use as a prebiotic feed supplement for L. vannamei culture. Results observed in a 30-day feeding trial showed that dietary supplementation of copra-derived MOS, with doses varying from 4 to 10 g kg-1 of dried feed, increased the number of intestinal Lactobacilli and Bifdobacteria in shrimps fed copra-MOS supplemented diets increased approximately from 150-300%. The number of intestinal presumptive Vibrio, Coliforms, Clostridia and Salmonella reduced to 39.6-54.1%, 56.9-65.9%, 71.8-86.1% and 100-100%, respectively. In addition, copra-MOS supplement in the feed led to an enhancement of the weight gain, specifc growth rate, feed conversion ratio and feed intake of shrimps (P<0.05). After a 7-day challenging test with Vibrio harveyi pathogen (~106 CFU mL-1) by immersion, the cumulative mortality of the shrimps fed with the diet supplemented 10 g kg-1 copra-MOS was 3.5%, that obviously decreased compared to the control shrimps (29.5% mortality). Taking advantage of its intestinal microfora modulation towards increasing probiotic-like bacteria and Vibriosis resistance, this cheap oligosaccharide will be valuable in various aquatic animal farming. © 2013 Cuong DB, et al.


PubMed | Natural History Museum in London, Justus Liebig University, University of Rostock, Research Institute For Aquaculture No 1 and Vietnam Institute of Geosciences and Mineral Resources
Type: Journal Article | Journal: Zootaxa | Year: 2016

A total of 169 specimens of the orange-spotted grouper Epinephelus coioides (Hamilton) were collected from fishermen and marine fish farms in the Gulf of Tonkin, Vietnam. Five different species of Prosorhynchus Odhner, 1905 were recorded, including P. tonkinensis n. sp. The new species differs from all other Prosorhynchus species in the presence of an indented posterior extremity. It can be distinguished from the most closely related P. atlanticus Manter, 1940 and P. crucibulum Rudolphi, 1819 by the extension of the uterus always to the level of the ovary, the width and premouth distance in the former, and the arched vitellarium and smaller egg size in the latter, and a different host and geographical region. Prosorhynchus sp. A (not fully identified in this study) has been earlier reported from E. coioides from New Caledonia (see Prosorhynchus sp. B of Bray and Justine, 2013), P. luzonicus Velasquez, 1959 is reported throughout South-East Asia, and Prosorhynchus sp. B (no further identification possible based on a single specimen in this study) and P. maternus Bray & Justine, 2006 are reported for the first time from Vietnam. The present study demonstrates a close relationship of the Prosorhynchus species composition in Vietnam with the Indo-Australian region, warranting further comparative studies among the different epinephelids.


Nguyen H.Q.,Norwegian University of Science and Technology | Reinertsen H.,Norwegian University of Science and Technology | Rustad T.,Norwegian University of Science and Technology | Tran T.M.,Research Institute For Aquaculture No 1 | Kjorsvik E.,Norwegian University of Science and Technology
Aquaculture Research | Year: 2012

Twenty egg batches spawned naturally from 17 different females over two spawning seasons were used to evaluate the egg quality of cobia Rachycentron canadum. A reduction in egg size was observed towards the end of the spawning season for both years. The proportion of floating eggs demonstrated a positive linear relationship with both yolk-sac larval survival (r 2=0.91, P<0.05) and batch larval production (r 2=0.80, P<0.01). Viable egg batches (i.e. fertilization success >50%) were of higher batch fecundity, had larger eggs and a higher proportion of floating eggs than non-viable batches (i.e. 0% fertilization success). Also, biochemical analyses revealed that these viable eggs had significantly higher protein and amino acid contents. A multiple regression model based on the proportion of floating eggs, batch fecundity and fertilization success provided the most accurate predictions of batch larval production (r 2=0.95, P<0.001). Similarly, using the egg content of arginine/glycine and methionine significantly increased the correlation coefficient in the multiple regression model predicting larval deformity (r 2=0.92, P=0.002). This study reveals that accurate determination of egg quality in cobia can be improved using a combination of several variables rather than a single variable. © 2011 Blackwell Publishing Ltd.


Nguyen H.Q.,Norwegian University of Science and Technology | Tran T.M.,Research Institute For Aquaculture No 1 | Reinertsen H.,Norwegian University of Science and Technology | Kjorsvik E.,Norwegian University of Science and Technology
Journal of the World Aquaculture Society | Year: 2010

Broodstocks of cobia, Rachycentron canadum, were fed raw fish (RF) or three formulated diets of similar proximate composition but different n-3 highly unsaturated fatty acid (HUFA) levels: 0.94% (D1), 1.31% (D2), or 1.72% (D3) of the dry weight (dw). Egg fatty acid composition was significantly different between dietary groups and reflected that of the diets. The total n-3 HUFA and especially docosahexaenoic acid contents in eggs of groups fed formulated diets were significantly lower than in group fed RF, whereas the egg content of arachidonic acid (ARA) in groups fed Diets D2 and D3 were significantly higher than in groups fed Diets D1 and RF (P <0.05). Although no significant differences in spawning quality were found among dietary groups (P >0.05), a tendency of better spawning performance was observed in the group fed RF (1.86% n-3 HUFA of dw). A tendency of lower fertilization success was associated with groups that had higher egg content of ARA (D2 and D3). Results of this study suggest that cobia broodstock requirements of dietary n-3 HUFA should be higher than 1.86% dw and that high dietary levels of ARA (0.42-0.60% dw) may affect cobia fertilization success negatively. © by the World Aquaculture Society 2010.


Ninh N.H.,Research Institute For Aquaculture No 1 | Thoa N.P.,University of The Sunshine Coast | Knibb W.,University of The Sunshine Coast | Nguyen N.H.,University of The Sunshine Coast
Aquaculture | Year: 2014

The main aim of this paper was to report genetic parameters and selection response from a synthetic population of Nile tilapia selected for improved growth performance in brackish water systems in Vietnam. The synthetic base population was formed in 2007 from the best performing individuals for growth produced from a complete diallel cross involving three strains of Nile tilapia, namely GIFT (Genetically Improved Farmed Tilapia), Taiwan and NOVIT4 (GIFT-derived) strains. Selection was practised for increased harvest weight in brackish water (15-20ppt) over four generations from 2008 to 2011. A total of 12,006 individuals had performance data records. They were offspring of 341 sires and 450 dams (averaging 3000 offspring and 70 sires and 90 dams in each generation). Mixed models fitted to the data included the fixed effects of generation, sex, their two way interaction and a linear covariate of age within sex and generation. The random terms in the model were sire within generation and dam within sire and generation. The estimates of heritability for body traits and survival were moderate to high (0.27 to 0.53). Genetic correlations between harvest weight and body length were high and positive (0.97), whereas those between body traits and survival were low and not significantly different from zero. Genetic gain per generation was measured as estimated breeding values and expressed in actual units (original scale of measurement) and genetic standard deviation unit (σG). The improvement achieved for harvest weight ranged from 1.1 to 1.6 σG after four generations of selection (one year per generation). Selection for increased harvest weight was however accompanied by a non-significant decrease in survival by -0.24%-units or -0.16σG. The large genetic variation in both harvest weight and survival, however, suggests that there is a scope for simultaneous improvement of both traits in this population of Nile tilapia. It is concluded that our selective breeding programme has succeeded in developing a productive strain of Nile tilapia under brackish water systems, but the future work should include survival rate in the recording system, selection index and breeding objective. © 2014 Elsevier B.V.


Van Vo B.,Curtin University Australia | Van Vo B.,Research Institute For Aquaculture No 1 | Bui D.P.,Research Institute For Aquaculture No 1 | Nguyen H.Q.,Research Institute For Aquaculture No 1 | Fotedar R.,Curtin University Australia
Aquaculture | Year: 2015

This study aimed to investigate if the fermentation of sweet lupin, Lupinus angustifolius, increases the inclusion level of the lupin by replacing fishmeal content in the formulated diets of juvenile barramundi. Sweet lupin kernel was fermented by Lactobacilli (3.108CFU/g) for 72h to be used to replace fishmeal at 0%, 30%, 45%, 60%, and 75% of inclusion levels. The results showed that the fermentation of lupin significantly reduced the amount of anti-nutrients and improved the amino acid profile of the lupin. The growth rates of the juvenile barramundi were not adversely affected by the different inclusion levels of fermented lupin in the diets. There was an even significant increase in the final weight and length of the barramundi fed 45% and 60% fishmeal replacement diets. The survival rates were more than 93% in all dietary treatments. Feed conversion rates (FCR) were unchanged among the diets, except significantly higher FCR shown in 75% fishmeal replacement diet. The differences of protein digestibility among diets were not significant. However, hydrolyzed fat and phosphorus in the diets significantly increased (p<0.05) when the fermented lupin inclusion level rose from 30% to75%. Fish carcass protein, fat, and energy contents were not significantly affected by any diet, while essential amino acid profiles revealed a little change. In conclusion, the fermentation by Lactobacilli improved the lupin's nutritional quality, allowing higher inclusion level in barramundi diets. © 2015 Elsevier B.V.


PubMed | Vietnam Academy of Science and Technology, Research Institute For Aquaculture No 1 and Copenhagen University
Type: | Journal: Parasites & vectors | Year: 2015

Fish-borne zoonotic trematodes (FZT), such as Clonorchis sinensis, Opistorchis viverini (Opisthorchiidae) and intestinal trematodes of the family Heterophyidae, constitute a public health hazard in Vietnam and infections with these trematodes has been linked to consumption of raw or undercooked fish from aquaculture. The FZT transmission pathways, however, are more complicated than just the presence of intermediate snail hosts in aquaculture ponds as ponds may exchange water with surrounding habitats such as rice fields and irrigation canals and thereby these surrounding habitats may be a source of snails and cercariae and contribute to FZT infection in cultured fish.This is a longitudinal descriptive study on selected farms (n=30) in Nam Dinh Province which is endemic for FZT. At each farm, we sampled one pond, a small irrigation canal used to supply the pond with water, and a nearby rice field. At each of these three sites, we estimated the density of the FZT intermediate snail hosts and determined their trematode infection status. Comparative analysis was performed for the prevalence and density of FZT infections in fish and snails.Species of the Thiaridae, and most notably Melanoides tuberculata, the most important host species for FZT belonging to the Heterophyidae, were particularly abundant in ponds and small canals, i.e. M. tuberculata was found in 27 ponds and 13 small canals. Bithynia fuchsiana, a potential host for both Heterophyidae and Opisthorchiidae, was rarely found in fish ponds but common in rice fields. A total of 12 types of cercariae were found in the snails and pleurolophocercous cercariae, primarily FZT, constituted about 40 % of all cercarial infections. The fish species cultured were mainly carp species and Haplorchis pumilio was the dominating trematode species infecting fish. Clonorchis spp. were not recorded in any of the ponds. FZT transmission to fish was intense during the summer period (May-June to November) but less intense during the winter months (December-January) partly because cercarial emergence ceases due to the low temperature.Our findings highlight the complexity of FZT transmission within aquaculture farm settings and suggest that efforts to control these infections must take a holistic approach using interventions against all stages of the transmission cycle.


PubMed | Research Institute For Aquaculture No 1 and Tokyo University of Marine Science and Technology
Type: Journal Article | Journal: Genome announcements | Year: 2015

A strain of Vibrio (KC13.17.5) causing acute hepatopancreatic necrosis disease (AHPND) in shrimp in northern Vietnam was isolated. Normally, AHPND is caused by Vibrioparahaemolyticus, but the genomic sequence of the strain indicated that it belonged to Vibrioharveyi. The sequence data included plasmid-like sequences and putative virulence genes.


PubMed | Vietnam Academy of Science and Technology and Research Institute For Aquaculture No 1
Type: Journal Article | Journal: Systematic parasitology | Year: 2016

A total of 21 Pharao flyingfish Cypselurus naresii (Gnther) from the Gulf of Tonkin off Vietnam was examined for monogeneans. Ten individuals were parasitised by 72 specimens of two new axinid species of two rare and little known genera, Unnithanaxine Price, 1962 containing only one species, U. parawa (Unnithan, 1957), and Loxuroides Price, 1962 containing two species, L. sasikala (Unnithan, 1957) and L. fungilliformis Zhang, Ding, Liu & Wang, 1999. Unnithanaxine naresii n. sp. and Loxuroides pricei n. sp. are described and differentiated from the related species. Unnithanaxine naresii n. sp. is morphologically similar to U. parawa but is distinguished by the size of the clamps and reproduction organs, the number of spines in the lateral groups of the genital atrium, and in parasitism in a host fish species of a different genus. Loxuroides pricei n. sp. differs from L. fungilliformis in the greater size of the body, the number of clamps, testes, spines on cirrus and genital atrium, and in parasitism in a different host family. Similarly, L. pricei can be separated from L. sasikala in having a shorter distance from the anterior extremity to genital atrium or vaginal region, fewer testes, and a slightly greater number of spines on cirrus and genital atrium.

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