Population genetic structure of three major river Populations of rohu,Labeo rohita (Cyprinidae: Cypriniformes) using microsatellite DNA markers

Alam, Samsul; Jahan, Marya; Hossain, Md. Mokarrom; Islam, Md. Shahidul

doi:10.1007/bf03191137

Cited by 23 publications

(31 citation statements)

References 17 publications

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“…The present findings contradict the findings of Alam et al, (2009) where they used four microsatellite loci for population genetic analysis of Labeo rohita samples from three rivers of Bangladesh and found observed heterozygosity to be less than expected heterozygosity with positive inbreeding coefficient which was correlated with the reduction in population size due to overexploitation, contamination of gene pool through introgression, bottleneck effect, habitat degradation, environmental pollution, etc..…”

Section: Microsatellite Based Genetic Variations Between the Populationscontrasting

confidence: 99%

Genetic Diversity Analysis of Labeo rohita (Hamilton, 1822) Collected from Two Zones of River Ganga Using Microsatellite DNA Markers

Joshi¹,

Lohni²,

Ram³

2017

Int.J.Curr.Microbiol.App.Sci

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Section: Microsatellite Based Genetic Variations Between the Populationscontrasting

confidence: 99%

Genetic Diversity Analysis of Labeo rohita (Hamilton, 1822) Collected from Two Zones of River Ganga Using Microsatellite DNA Markers

Joshi¹,

Lohni²,

Ram³

2017

Int.J.Curr.Microbiol.App.Sci

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“…We observed that average observed heterozygosity and expected heterozygosity was lower than that of obtained in the study by Das et al (2005) but higher than that of obtained by Alam et al (2009). Moreover, heterozygosity in the hybrid population was also fairly good with the observed value of 0.542±0.292 and expected value of 0.534±0.176; that indicated positive heterosis through strains crossing of rohu.…”

Section: Discussionmentioning

confidence: 46%

“…Again in these same four loci the average observed heterozygosity and expected heterozygosity were 0.746 and 0.621 (Das et al, 2005) and 0.413 and 0.493 (Alam et al, 2009) in the Indian major carp populations. We observed that average observed heterozygosity and expected heterozygosity was lower than that of obtained in the study by Das et al (2005) but higher than that of obtained by Alam et al (2009).…”

Section: Discussionmentioning

confidence: 89%

“…Das et al (2005) Nei's (1972) developed microsatellite markers obtained all the studied loci polymorphic in an Indian farmed population of L. rohita. Using four loci they obtained a total of 20 alleles (5 alleles in average) and Alam et al (2009) obtained only 14 alleles, while we obtained 20 alleles by using three loci. The authors did not, however, study population level genetic variation of this important fish species through intra-strain crosses, and assessing hetetosis in relation to these markers.…”

Section: Discussionmentioning

confidence: 99%

“…The study of Alam et al (2009) indicates that the Bangladesh populations of L. rohita have lost a few alleles. But presence of a large number of null alleles in all the population in the present study also indicates loss of different alleles from the rivers as well as hatchery populations.…”

Section: Discussionmentioning

confidence: 99%

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Shah¹,

Sutapa²,

Islam³

et al. 2017

Turk. J. Fish. Aquat. Sci.

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Labeo rohita is an important commercial aquaculture species in Bangladesh, but it needs improved growth performance to meet the increasing demand for fish. Genetic improvement through inter-strain crossing, generating heterosis, is quicker than a selection strategy. Therefore, crosses were made between two strains of rohu: Padma River strain and a hatchery strain. Growth performance analyis showed the highest growth rate in the Padma × Padma cross followed by one of the reciprocal crosses Hatchery♂ × Padma♀ (hybrid). The lowest growth rate was observed in Hatchery × Hatchery cross. DNA variability study using three microsatellite markers showed polymorphism (P95) in these crosses. Variations were observed in number and frequencies of alleles and mean heterozygosity in different loci; the mean number of alleles varied from 4.667±0.882, 3.333±1.333 and 2.667±1.202 in Padma, hybrid and Hatchery strains respectively. Relatively high levels of gene flow and low Strain differentiation (FST ) values were found between the Padma and hybrid strains. The UPGMA dendrogram based on genetic distance placed the Padma population in one cluster and the hybrid and Hatchery populations in another. The results revealed that there was relatively low level of genetic variability in the riverine and hatchery reared populations of L. rohita in Bangladesh.

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Population genetics of the endangered Clanwilliam sandfish Labeo seeberi: considerations for conservation management

Rhode,

Lesch,

Hull

et al. 2023

Aquat Sci

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The Cape Fold Ecoregion (CFE) is one of southern Africa’s unique aquatic ecoregions and its freshwater fish fauna is characterized by high levels of endemism. As with many other Mediterranean-type ecosystems, the region is also a hotspot for threatened and range-restricted freshwater fish. Many of the CFE’s endemic species are at risk for extinction, with declines in population sizes and distribution ranges. The Clanwilliam sandfish Labeo seeberi is an example of such a species and is considered one of South Africa’s most endangered large migratory cyprinids. This species is endemic to the Olifants/Doring river system in the CFE and has been subject to a major population decline, mainly as a result of invasive alien fish and adverse climate events. Little is known of the genetics of the Clanwilliam sandfish, thus this study aimed to provide basic population genetic parameters to inform future conservation interventions. Both microsatellite and mitochondrial DNA (mtDNA) markers were used to assess populations from three sites within the Olifants/Doring river system. Genetic diversity was moderate to low and did not reflect the drastic decline expected on the basis of previous relative abundance data. This is likely due to a lag effect between ecological/life history demographics (due to juvenile recruitment failures) and population genetic composition. Furthermore, there was limited genetic differentiation between the sampling locations, suggesting a single breeding population, but mtDNA haplotype distribution and slight divergence of the smaller populations does suggest that the population might have become recently fragmented. The results show that the effective population size of the current breeding population might still be sufficient to maintain evolutionary potential in the short term, which could act as a buffer until conservation strategies focusing on protecting breeding animals and maximizing juvenile survival can restore population numbers.

show abstract

Population genetic structure of three major river Populations of rohu,Labeo rohita (Cyprinidae: Cypriniformes) using microsatellite DNA markers

Cited by 23 publications

References 17 publications

Genetic Diversity Analysis of Labeo rohita (Hamilton, 1822) Collected from Two Zones of River Ganga Using Microsatellite DNA Markers

Genetic Diversity Analysis of Labeo rohita (Hamilton, 1822) Collected from Two Zones of River Ganga Using Microsatellite DNA Markers

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Population genetics of the endangered Clanwilliam sandfish Labeo seeberi: considerations for conservation management

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