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Rehman S, Gora A, Kizhakudan J, Ilamparuthi S, Anbarasu M, Sanil NK, Laxmilatha P. Identification, characterization and infection dynamics of Vibrio strains in phyllosoma of Thenus unimaculatus. JOURNAL OF APPLIED ANIMAL RESEARCH 2022. [DOI: 10.1080/09712119.2022.2050736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Saima Rehman
- Marine Biotechnology Division, Madras Research Centre of ICAR-Central Marine Fisheries Research Institute, Chennai, India
| | - Adnan Gora
- Marine Biotechnology Division, Madras Research Centre of ICAR-Central Marine Fisheries Research Institute, Chennai, India
| | - Joe Kizhakudan
- Mariculture Division, Madras Research Centre of ICAR- Central Marine Fisheries Research Institute, Chennai, India
| | - Santoshi Ilamparuthi
- Marine Biotechnology Division, Madras Research Centre of ICAR-Central Marine Fisheries Research Institute, Chennai, India
| | - Mahalingam Anbarasu
- Mariculture Division, Madras Research Centre of ICAR- Central Marine Fisheries Research Institute, Chennai, India
| | - N. K. Sanil
- Marine Biotechnology Division, ICAR-Central Marine Fisheries Research Institute, Kochi, India
| | - Pappurajam Laxmilatha
- Molluscan Fisheries Division, ICAR-Central Marine Fisheries Research Institute, Kochi, India
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Vu NT, Sang NV, Trong TQ, Duy NH, Dang NT, Nguyen NH. Breeding for improved resistance to Edwardsiella ictaluri in striped catfish (Pangasianodon hypophthalmus): Quantitative genetic parameters. JOURNAL OF FISH DISEASES 2019; 42:1409-1417. [PMID: 31424570 DOI: 10.1111/jfd.13067] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 07/09/2019] [Accepted: 07/11/2019] [Indexed: 06/10/2023]
Abstract
Bacillary necrosis of Pangasius (BNP), caused by Edwardsiella ictaluri, is one of the most devastating diseases in striped catfish farming. To date, quantitative genetic inheritance of BNP resistance is not known in striped catfish Pangasianodon hypophthalmus. The main aim of this study was to estimate genetic parameters for BNP resistance in a breeding population of striped catfish undergoing four generations of selection for high growth. Specifically, the study examined whether BNP resistance is heritable to enable family selection and whether genetic improvement for enhanced BNP resistance may have detrimental effects on growth and survival rate. To test these hypotheses, 720 full- and half-sib families were challenged with E. ictaluri pathogen using injection and cohabitation methods over four years, from 2010 to 2012 and 2015. In total, the data included 398,234 animals in the pedigree, from which 18,849 animals had disease challenge test records and 39,103 siblings had growth performance. Both univariate and bivariate sire-dam linear and threshold mixed models were used to estimate (co)variance components for BNP resistance, survivals and growth traits. The estimates of heritability for the BNP resistance recorded as death or survival were low regardless of models used (0.10-0.16), whereas survival time (days post-challenge test) showed moderate heritability (0.35). The survival rate during hapa rearing had medium heritability (0.33-0.52). The genetic correlations of BNP resistance with body weight and survival were all positive (0.03-0.53), suggesting that selection of increased BNP resistance may have positive impacts on growth and survival traits, and these traits could be easily improved simultaneously in the selective breeding programme for striped catfish.
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Affiliation(s)
- Nguyen Thanh Vu
- GeneCology Research Centre, School of Science and Engineering, University of the Sunshine Coast, Maroochydore, QLD, Australia
- Research Institute for Aquaculture No. 2, Ho Chi Minh City, Vietnam
| | - Nguyen Van Sang
- Research Institute for Aquaculture No. 2, Ho Chi Minh City, Vietnam
| | - Trinh Quoc Trong
- Research Institute for Aquaculture No. 2, Ho Chi Minh City, Vietnam
| | - Nguyen Huynh Duy
- Research Institute for Aquaculture No. 2, Ho Chi Minh City, Vietnam
| | - Nguyen Thi Dang
- Research Institute for Aquaculture No. 2, Ho Chi Minh City, Vietnam
| | - Nguyen Hong Nguyen
- GeneCology Research Centre, School of Science and Engineering, University of the Sunshine Coast, Maroochydore, QLD, Australia
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Selection for improved white spot syndrome virus resistance increased larval survival and growth rate of Pacific Whiteleg shrimp, Liptopenaeus vannamei. J Invertebr Pathol 2019; 166:107219. [PMID: 31330143 DOI: 10.1016/j.jip.2019.107219] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 07/17/2019] [Accepted: 07/18/2019] [Indexed: 11/23/2022]
Abstract
Outbreaks of contagious diseases, including White spot syndrome virus (WSSV), occur more frequently due to environment changes and as commercial shrimp production becomes intensified. The over-arching aim of this study was to examine new traits to improve disease resistance of Whiteleg shrimp, Liptopenaeus vannamei, to WSSV. Specifically, we made a compressive evaluation of the breeding population to determine a suitable selection criterion for improved WSSV resistance. To achieve this objective, we analysed five traits (viral titre, WSSV resistance, larval survival, body weight and standard length) recorded for 120,000 individual shrimps that were offspring of 228 sires and 300 dams produced over two generations of selection in 2017 and 2018. Our restricted maximum likelihood mixed model analysis showed that there is additive genetic variation in viral copy number (or viral titre, viral load) with the heritability that equals 0.18 ± 0.02. Viral titre displayed a moderate and negative genetic correlation with WSSV resistance (rg = -0.55). These results suggest that viral titre can be used as a selection criterion to improve WSSV resistance, but selection for decreased viral titre (i.e., increased resistance) may not capture all genetic expression in WSSV resistance. In addition to the estimation of population genetic parameters, we evaluated direct response to selection for increased WSSV resistance, which was measured as differences in estimated breeding values between the high and low resistant lines. The direct genetic gain achieved for WSSV resistance averaged 12.9% after one generation of selection in this Whiteleg shrimp population. The selection program also resulted in positive impacts on growth and larval survival by 7% and 17%, respectively. There is abundant genetic variation in WSSV resistance (h2 = 0.19-0.27), suggesting that the tested Whiteleg shrimp population will continue to respond to future selection. Collectively, the results obtained in our study provide important information to assist the design and implementation of genetic improvement programs for disease traits in aquaculture species, including L. vannamei.
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Trang TT, Hung NH, Ninh NH, Knibb W, Nguyen NH. Genetic Variation in Disease Resistance Against White Spot Syndrome Virus (WSSV) in Liptopenaeus vannamei. Front Genet 2019; 10:264. [PMID: 30984244 PMCID: PMC6447704 DOI: 10.3389/fgene.2019.00264] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 03/08/2019] [Indexed: 01/20/2023] Open
Abstract
White Spot Syndrome Virus (WSSV) is the most damaging pathogen in terms of production and economic losses for the shrimp sector world-wide. Estimation of heritability for WSSV resistance was made in this study to obtain necessary parameter inputs for broadening the breeding objectives of an ongoing selective breeding programme for Whiteleg shrimp (Liptopenaeus vannamei) that has focussed exclusively on improving growth performance since 2014. The present study involved a disease challenge test experiment using a total of 15,000 shrimps from 150 full- and half-sib families (100 individuals per family). Survival rates were recorded at six different experimental periods: 1–3 days (S1), 1–5 days (S2), 1–7 days (S3), 1–9 days (S4), 1–12 days (S5), and 1–15 days (S6) and were used as measures of WSSV resistance. There was significant variation in WSSV resistance among families studied. Quantitative-real time PCR (qPCR) analysis showed that the amount of viral titer (viral load) was significantly lower in high than low resistance families. Analyses of heritability were carried out using linear mixed model (LMM) and threshold logistic generalized model (TLGM). Both linear and threshold models used showed that the heritability (h2) for WSSV resistance was moderate in the early infection phases (S1–S4), whilst a low h2 value was observed for survival after 12 and 15 days of the challenge test (S5 and S6). The transformed heritabilities for WSSV resistance ranged from 1 to 31% which were somewhat lower than those estimated on the liability scale. Genetic correlations between survival rates measured over six different days post-infection were high and positive (0.82–0.99). The phenotypic correlations ranged from 0.31 ± 0.01 to 0.97 ± 0.01. The genetic correlations between body weights and WSSV resistance were negative. Our results on the heritability and genetic correlations show that improvement of WSSV resistance can be achieved through selective breeding in this population of Whiteleg shrimp.
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Affiliation(s)
- Trinh Thi Trang
- Faculty of Science, Health, Education and engineering, GeneCology Research Centre, University of the Sunshine Coast, Maroochydore, QLD, Australia.,Vietnam National University of Agriculture, Gia Lâm, Vietnam
| | - Nguyen Huu Hung
- Research Institute for Aquaculture No. 3, Nha Trang, Vietnam
| | - Nguyen Huu Ninh
- Research Institute for Aquaculture No. 3, Nha Trang, Vietnam
| | - Wayne Knibb
- Vietnam National University of Agriculture, Gia Lâm, Vietnam
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Vu NT, Nguyen NH. Quantitative genetic changes in reproductive performance of giant freshwater prawn after 10 years of selection for increased growth rate. Reprod Domest Anim 2018; 54:199-206. [DOI: 10.1111/rda.13326] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Accepted: 08/25/2018] [Indexed: 11/29/2022]
Affiliation(s)
- Nguyen Thanh Vu
- National Breeding Centre for Southern Freshwater Aquaculture; Research Institute for Aquaculture N.2; Ho Chi Minh City Vietnam
- Faculty of Science, Health, Education and Engineering; University of the Sunshine Coast; Maroochydore Queensland Australia
| | - Nguyen Hong Nguyen
- Faculty of Science, Health, Education and Engineering; University of the Sunshine Coast; Maroochydore Queensland Australia
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Khang PV, Phuong TH, Dat NK, Knibb W, Nguyen NH. An 8-Year Breeding Program for Asian Seabass Lates calcarifer: Genetic Evaluation, Experiences, and Challenges. Front Genet 2018; 9:191. [PMID: 29897055 PMCID: PMC5987403 DOI: 10.3389/fgene.2018.00191] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 05/11/2018] [Indexed: 11/13/2022] Open
Abstract
Selective breeding for marine finfish is challenging due to difficulties in reproduction, larval rearing, and on-growth in captive environments. The farming of Asian seabass (Lates calcarifer) has all these problems and our knowledge of the quantitative genetic information (heritability and correlations) of traits necessary for commercial exploitation is poor. The present study was conducted to address this knowledge gap and to provide information that can be applied to sea bass and other aquaculture species. We carried out a comprehensive genetic evaluation for three traits (body weight, total length, and survival) collected from a breeding population for Asian seabass over an eight-year period from 2010 to 2017. Statistical analysis was carried out on 4,567 adult fish at 105, 180, 270, 360, 450, and 570 days post-hatch (dph). The heritabilities (h2) estimated for body weight and length using linear mixed model were moderate to high (0.12 to 0.78 and 0.41 to 0.85, respectively) and they differed between the measurement periods. Survival during grow-out phase was analyzed using threshold logistic and probit models. The heritability estimates for survival rate on the underlying liability scale ( hL2 ) varied from 0.05 to 0.21. When the observed heritability obtained from the linear mixed model was back-transformed to the liability scale, they were similar but not significant. In addition, we examined effects of genotype by environment (G × E) interaction on body traits. The genetic correlation for body weight between tank and sea cage cultures were high (0.91-0.94) in the first and second rearing periods (180 and 270 dph) but the correlation was decreased to 0.59 ± 0.33 at 360 dph. This suggests that the genotype by environment interaction is important for body traits in this population. Furthermore, the genetic correlations of body weights between different measurement periods were moderate but different from one. This suggests that body weights measured at different time points may be different traits and selection for improved early weight may not capture all genetic expressions in subsequent rearing periods in Asian seabass. Selection of the nucleus in sea cages may produce genotypes that do not perform equally well in tanks, although this deserves further studies to determine a suitable selection environment and optimize the breeding program. This paper discusses challenges encountered during implementation of the selection program for L. calcarifer.
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Affiliation(s)
- Pham Van Khang
- GenCology Research Centre, University of the Sunshine Coast, Maroochydore, QLD, Australia.,Department of Science, Technology and Environment, Ministry of Agriculture and Rural Development, Hanoi, Vietnam
| | | | | | - Wayne Knibb
- GenCology Research Centre, University of the Sunshine Coast, Maroochydore, QLD, Australia
| | - Nguyen Hong Nguyen
- GenCology Research Centre, University of the Sunshine Coast, Maroochydore, QLD, Australia
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