Genetic variation among full-sib families and the effect of non-genetic factors on growth traits at harvest in Clarias magur (Hamilton, 1822)
Magur (Clarias magur) is an Indian catfish species with a good potential for aquaculture. The expansion of magur aquaculture is hindered because of low reproductive and survival rates. Furthermore, males need to be sacrificed to collect milt for artificial fertilization. At present, magur seed produ...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2020-11-01
|
| Series: | Aquaculture Reports |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352513419303576 |
| _version_ | 1811261576349483008 |
|---|---|
| author | Roshan Rameez Shrinivas Jahageerdar Thongam Ibemcha Chanu Jayashankar Jayaraman Rama Bangera |
| author_facet | Roshan Rameez Shrinivas Jahageerdar Thongam Ibemcha Chanu Jayashankar Jayaraman Rama Bangera |
| author_sort | Roshan Rameez |
| collection | DOAJ |
| description | Magur (Clarias magur) is an Indian catfish species with a good potential for aquaculture. The expansion of magur aquaculture is hindered because of low reproductive and survival rates. Furthermore, males need to be sacrificed to collect milt for artificial fertilization. At present, magur seed production mainly depends on the wild-caught juveniles and to a smaller extent, from broodfish whose genetic potential is unknown. The availability of high-quality seeds in a sustainable way can be ensured through the selective breeding program for magur. The knowledge of factors influencing growth traits and their genetic parameters is a pre-requisite for implementing a genetic selection program. The present study aimed to quantify the performance of C.magur reared in a two-year class and estimate their heritabilities at stocking and harvest and also to estimate the genetic and phenotypic correlations among them. The growth traits such as Body Weight (BW), Total Length (TL), Body Depth (BD), Head Width (HW), and Average Daily Gain (ADG) were recorded from 1413 animals belonging to 78 fullsib families produced by adopting single pair mating design, after one year of pond culture (traits at harvest). Genetic parameters were also estimated for body weight (BW0) and total length (TL0) measured from 2328 fish from 78 fullsib families at the time of stocking. Magur attained an average BW of 135 g and 24.5 cm TL after one year culture period. The heritabilities of BW, TL, and ADG were 0.44 ± 0.07, 0.32 ± 0.06, and 0.42 ± 0.07, respectively and may be biased upwardly due to the single pair mating design. Genetic correlations between harvest traits were all positive and varied in magnitude between traits (0.74 to 0.99). The results obtained from the current study indicate the presence of genetic variation in magur population for growth traits and selection based on genetic merit can produce improvement in these traits. |
| first_indexed | 2024-04-12T19:06:55Z |
| format | Article |
| id | doaj.art-bf5c85de655e476b8f47edcc0a0ac005 |
| institution | Directory Open Access Journal |
| issn | 2352-5134 |
| language | English |
| last_indexed | 2024-04-12T19:06:55Z |
| publishDate | 2020-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Aquaculture Reports |
| spelling | doaj.art-bf5c85de655e476b8f47edcc0a0ac0052022-12-22T03:19:59ZengElsevierAquaculture Reports2352-51342020-11-0118100411Genetic variation among full-sib families and the effect of non-genetic factors on growth traits at harvest in Clarias magur (Hamilton, 1822)Roshan Rameez0Shrinivas Jahageerdar1Thongam Ibemcha Chanu2Jayashankar Jayaraman3Rama Bangera4ICAR-CIFE, Mumbai, IndiaICAR-CIFE, Mumbai, India; Corresponding author.ICAR-CIFE, Kakinada, Andhra Pradesh, IndiaICAR-CMFRI, Kochi, IndiaAKVAFORSK GENETICS, Sunndalsøra, NorwayMagur (Clarias magur) is an Indian catfish species with a good potential for aquaculture. The expansion of magur aquaculture is hindered because of low reproductive and survival rates. Furthermore, males need to be sacrificed to collect milt for artificial fertilization. At present, magur seed production mainly depends on the wild-caught juveniles and to a smaller extent, from broodfish whose genetic potential is unknown. The availability of high-quality seeds in a sustainable way can be ensured through the selective breeding program for magur. The knowledge of factors influencing growth traits and their genetic parameters is a pre-requisite for implementing a genetic selection program. The present study aimed to quantify the performance of C.magur reared in a two-year class and estimate their heritabilities at stocking and harvest and also to estimate the genetic and phenotypic correlations among them. The growth traits such as Body Weight (BW), Total Length (TL), Body Depth (BD), Head Width (HW), and Average Daily Gain (ADG) were recorded from 1413 animals belonging to 78 fullsib families produced by adopting single pair mating design, after one year of pond culture (traits at harvest). Genetic parameters were also estimated for body weight (BW0) and total length (TL0) measured from 2328 fish from 78 fullsib families at the time of stocking. Magur attained an average BW of 135 g and 24.5 cm TL after one year culture period. The heritabilities of BW, TL, and ADG were 0.44 ± 0.07, 0.32 ± 0.06, and 0.42 ± 0.07, respectively and may be biased upwardly due to the single pair mating design. Genetic correlations between harvest traits were all positive and varied in magnitude between traits (0.74 to 0.99). The results obtained from the current study indicate the presence of genetic variation in magur population for growth traits and selection based on genetic merit can produce improvement in these traits.http://www.sciencedirect.com/science/article/pii/S2352513419303576HeritabilityGenetic correlationNon-genetic factorsMagurGrowth traits |
| spellingShingle | Roshan Rameez Shrinivas Jahageerdar Thongam Ibemcha Chanu Jayashankar Jayaraman Rama Bangera Genetic variation among full-sib families and the effect of non-genetic factors on growth traits at harvest in Clarias magur (Hamilton, 1822) Aquaculture Reports Heritability Genetic correlation Non-genetic factors Magur Growth traits |
| title | Genetic variation among full-sib families and the effect of non-genetic factors on growth traits at harvest in Clarias magur (Hamilton, 1822) |
| title_full | Genetic variation among full-sib families and the effect of non-genetic factors on growth traits at harvest in Clarias magur (Hamilton, 1822) |
| title_fullStr | Genetic variation among full-sib families and the effect of non-genetic factors on growth traits at harvest in Clarias magur (Hamilton, 1822) |
| title_full_unstemmed | Genetic variation among full-sib families and the effect of non-genetic factors on growth traits at harvest in Clarias magur (Hamilton, 1822) |
| title_short | Genetic variation among full-sib families and the effect of non-genetic factors on growth traits at harvest in Clarias magur (Hamilton, 1822) |
| title_sort | genetic variation among full sib families and the effect of non genetic factors on growth traits at harvest in clarias magur hamilton 1822 |
| topic | Heritability Genetic correlation Non-genetic factors Magur Growth traits |
| url | http://www.sciencedirect.com/science/article/pii/S2352513419303576 |
| work_keys_str_mv | AT roshanrameez geneticvariationamongfullsibfamiliesandtheeffectofnongeneticfactorsongrowthtraitsatharvestinclariasmagurhamilton1822 AT shrinivasjahageerdar geneticvariationamongfullsibfamiliesandtheeffectofnongeneticfactorsongrowthtraitsatharvestinclariasmagurhamilton1822 AT thongamibemchachanu geneticvariationamongfullsibfamiliesandtheeffectofnongeneticfactorsongrowthtraitsatharvestinclariasmagurhamilton1822 AT jayashankarjayaraman geneticvariationamongfullsibfamiliesandtheeffectofnongeneticfactorsongrowthtraitsatharvestinclariasmagurhamilton1822 AT ramabangera geneticvariationamongfullsibfamiliesandtheeffectofnongeneticfactorsongrowthtraitsatharvestinclariasmagurhamilton1822 |