Genetic correlations between harvest weight and secondary traits in a silver carp (Hypophthalmichthys molitrix) genetic improvement program
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-a...
| Autores principales: | , , , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
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Springer
2023
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| Acceso en línea: | https://hdl.handle.net/10568/126585 |
| _version_ | 1855535921123819520 |
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| author | Hamilton, Matthew Yeasin, Mohammed Chadag, Vishnumurthy Mohan Delamare-Deboutteville, Jerome Debnath, Partho Pratim Benzie, John |
| author_browse | Benzie, John Chadag, Vishnumurthy Mohan Debnath, Partho Pratim Delamare-Deboutteville, Jerome Hamilton, Matthew Yeasin, Mohammed |
| author_facet | Hamilton, Matthew Yeasin, Mohammed Chadag, Vishnumurthy Mohan Delamare-Deboutteville, Jerome Debnath, Partho Pratim Benzie, John |
| author_sort | Hamilton, Matthew |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | 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. |
| format | Journal Article |
| id | CGSpace126585 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| publisher | Springer |
| publisherStr | Springer |
| record_format | dspace |
| spelling | CGSpace1265852025-12-02T10:59:51Z Genetic correlations between harvest weight and secondary traits in a silver carp (Hypophthalmichthys molitrix) genetic improvement program Hamilton, Matthew Yeasin, Mohammed Chadag, Vishnumurthy Mohan Delamare-Deboutteville, Jerome Debnath, Partho Pratim Benzie, John genetic improvement cyprinidae silver carp hypophthalmichthys molitrix fish primary trait secondary trait 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. 2023-02 2023-01-05T08:07:32Z 2023-01-05T08:07:32Z Journal Article https://hdl.handle.net/10568/126585 en Open Access application/pdf Springer Matthew Hamilton, Mohammed Yeasin, Vishnumurthy Mohan Chadag, Jerome Delamare-Deboutteville, Partho Pratim Debnath, John Benzie. (23/9/2022). Genetic correlations between harvest weight and secondary traits in a silver carp (Hypophthalmichthys molitrix) genetic improvement program. Aquaculture International. |
| spellingShingle | genetic improvement cyprinidae silver carp hypophthalmichthys molitrix fish primary trait secondary trait Hamilton, Matthew Yeasin, Mohammed Chadag, Vishnumurthy Mohan Delamare-Deboutteville, Jerome Debnath, Partho Pratim Benzie, John Genetic correlations between harvest weight and secondary traits in a silver carp (Hypophthalmichthys molitrix) genetic improvement program |
| title | Genetic correlations between harvest weight and secondary traits in a silver carp (Hypophthalmichthys molitrix) genetic improvement program |
| title_full | Genetic correlations between harvest weight and secondary traits in a silver carp (Hypophthalmichthys molitrix) genetic improvement program |
| title_fullStr | Genetic correlations between harvest weight and secondary traits in a silver carp (Hypophthalmichthys molitrix) genetic improvement program |
| title_full_unstemmed | Genetic correlations between harvest weight and secondary traits in a silver carp (Hypophthalmichthys molitrix) genetic improvement program |
| title_short | Genetic correlations between harvest weight and secondary traits in a silver carp (Hypophthalmichthys molitrix) genetic improvement program |
| title_sort | genetic correlations between harvest weight and secondary traits in a silver carp hypophthalmichthys molitrix genetic improvement program |
| topic | genetic improvement cyprinidae silver carp hypophthalmichthys molitrix fish primary trait secondary trait |
| url | https://hdl.handle.net/10568/126585 |
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