Genotype-by-culture-system interaction in catla and silver carp: Monoculture and biculture

Hamilton, Matthew; Mekkawy, Wagdy; Alam, Md. Shahin; Barman, B.K.; Karim, Muhammad Rezaul; Benzie, John A. H.

doi:10.1016/j.aquaculture.2022.738846

Cited by 5 publications

(6 citation statements)

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“…Despite the global significance of silver carp, very few estimates of heritability for, or genetic correlations with, harvest weight are present in the literature (Gheyas et al 2009;Hamilton et al 2022b). However, the narrow-sense heritability estimate in the current study ( ĥ2 = 0.24) was relatively low compared with estimates for harvest weight in silver carp (first estimated by Gheyas et al (2009) -ĥ2 = 0.67, 95% confidence interval = 0.42-0.93) and other carp species (summarised in Hamilton et al 2022b), due in part to the presence of genotype-by-pond (i.e. genotype-by-environment) interaction between the six ponds under study (Hamilton et al 2022b).…”

Section: Discussionmentioning

confidence: 99%

“…For harvest-age weight, variance components and the narrow-sense heritability were estimated using ASReml (Gilmour et al 2014) according to the following univariate mixed model (Hamilton et al 2022b):…”

Section: Assessment Methodsmentioning

confidence: 99%

“…Details of the studied fish and their management up to the time of harvest-age weight measurement are provided in Hamilton et al (2022b). In brief, the study was undertaken on fish from the base population (i.e.…”

Section: Fish Managementmentioning

confidence: 99%

“…Founders were assigned to one of six genetic groups based on hatchery-identified origins and analysis of single nucleotide polymorphism (SNP) data (2007 SNPs;Hamilton et al 2021): (1) Sagor-Mukteshary-Jashore, (2) BRAC, (3) Joyda, (4) Raipur, (5) Akram-Puthia, and (6) Rajshahi-Parbatipur-Nimgachi. For the purpose of analysis, the Sagor-Mukteshary-Jashore and BRAC genetic groups were merged, due to the small number of founders from the BRAC genetic group (Hamilton et al 2022b).…”

Section: Fish Managementmentioning

confidence: 99%

“…To supplement natural feed, fish were fed a commercially available diet during grow out. The harvest-age weight of all surviving fish (N = 8012) was measured prior to sexual maturity at between 563 and 616 days of age (Hamilton et al 2022b).…”

Section: Fish Managementmentioning

confidence: 99%

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Genetic correlations between harvest weight and secondary traits in a silver carp (Hypophthalmichthys molitrix) genetic improvement program

et al. 2022

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In 2017, the base population of a family-based silver carp (Hypophthalmichthys molitrix) genetic improvement program was spawned in Bangladesh. This program aims to improve the growth rate of silver carp under polyculture production systems, through direct selection on the primary trait of harvest-age weight. The objective of this study was to quantify genetic variation in, and genetic correlations between, harvest-age weight (assessed on 8012 fish from 184 families) and a set of secondary traits (assessed on 1603 fish from 175 families). Secondary traits examined included feeding and digestive system traits (i.e. gill raker sponginess and gut length as a ratio of standard length), a morphometric trait (i.e. extent of overlap of pectoral and pelvic fins) and health traits (i.e. presence of Lernaea and prevalence of red spots — sites of inflammation/haemorrhaging). Despite not being under direct selection, genetic change in secondary traits is possible across generations in closed genetic improvement populations as a result of a correlated response to selection for the primary trait (i.e. indirect selection), adaptation to culture conditions, inbreeding and/or genetic drift. It was found that the additive genetic variance within genetic groups was significantly different from zero for all but the studied health traits. Heritability estimates for harvest-age weight and pectoral/pelvic fin overlap were moderate (0.24 and 0.22, respectively) but were low for gill raker score and relative gut length (0.12 and 0.09, respectively). Genetic correlations between harvest-age weight and secondary traits were not significantly different from zero, indicating that selection for harvest-age weight will not result in a correlated response to selection in the studied secondary traits.

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Section: Discussionmentioning

confidence: 99%

Section: Assessment Methodsmentioning

confidence: 99%

Section: Fish Managementmentioning

confidence: 99%

Section: Fish Managementmentioning

confidence: 99%

Section: Fish Managementmentioning

confidence: 99%

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Genetic correlations between harvest weight and secondary traits in a silver carp (Hypophthalmichthys molitrix) genetic improvement program

et al. 2022

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Role of Phytobiotics in Modulating Transcriptomic Profile in Carps: A Mini-Review

Wei,

Téllez-Isaías,

Abdul Kari

et al. 2024

Biochem Genet

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On-farm performance of genetically-improved rohu (Labeo rohita) in Bangladesh

et al. 2022

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IntroductionRohu (Labeo rohita Hamilton) is a globally significant aquaculture species for which genetically improved strains are increasingly available. In 2020, a multiplier population, comprised of highly–ranked generation-three (G3) families from the WorldFish Rohu Genetic Improvement Program, was released to hatcheries in Bangladesh for development into broodstock.MethodsTo estimate realised genetic gain for harvest weight in the G3-multiplier population, one pond from each of 19 Bangladeshi semi-commercial farms (ten in Jashore and nine in Natore–Rajshahi districts) were stocked with equal numbers of tagged fish from each of three strains. Strains included in the study were the ‘G3-multiplier’ released to hatcheries, a ‘control’ (putatively genetically equivalent to the unimproved base population which was spawned from fish of river origin) and fish sourced from a ‘commercial’ hatchery. Once stocked, fish were managed according to each farmer’s normal practices.ResultsThe G3-multiplier was found to be the most rapidly growing strain. Back-transformed means for harvest weight across farms for the commercial, control and G3-multiplier strains were 594 g, 659 g and 914 g, respectively, in Jashore, and 545 g, 626 g and 845 g in Natore–Rajshahi.DiscussionThese results equate to realised genetic gains of 38.6% (Jashore) and 34.9% (Natore–Rajshahi) for the G3-multiplier over the control strain and provide evidence that a family-based (i.e. pedigree-based) approach to genetic improvement is able to generate substantial levels of genetic gain in rohu. Furthermore, the clear growth advantages exhibited by the G3-multiplier strain over the control and commercial strains in this study, should encourage more Bangladeshi hatcheries, nurseries and farmers to adopt genetically improved rohu.

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Genotype-by-culture-system interaction in catla and silver carp: Monoculture and biculture

Cited by 5 publications

References 30 publications

Genetic correlations between harvest weight and secondary traits in a silver carp (Hypophthalmichthys molitrix) genetic improvement program

Genetic correlations between harvest weight and secondary traits in a silver carp (Hypophthalmichthys molitrix) genetic improvement program

Role of Phytobiotics in Modulating Transcriptomic Profile in Carps: A Mini-Review

On-farm performance of genetically-improved rohu (Labeo rohita) in Bangladesh

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