Weak genetic differentiation in cobia, Rachycentron canadum from Indian waters as inferred from mitochondrial DNA ATPase 6 and 8 genes

Abstract

Cobia, Rachycentron canadum, is an economically important migratory fish distributed in tropical waters worldwide and is a candidate fish species for aquaculture practices. The genetic stock structure of R. canadum distributed along the Indian waters was identified using mitochondrial ATPase 6 and 8 genes. A total of 842 bp sequence of ATPase 6/8 genes obtained in this study revealed 15 haplotypes with mean low nucleotide diversity (π = 0.001) and high haplotype diversity (h = 0.785). AMOVA indicated the genetic differentiation of 90.47% for individuals within the population. This is well supported by co-efficient of genetic differentiation (FST) values obtained for pairwise populations that were low and non-significant with an overall value of 0.002. The parsimony network tree revealed star-like phylogeny and all the haplotypes were connected with each other by single mutational event. The findings of the present study indicated the panmixia nature of the species which can be managed as a unit stock in Indian waters.

Iterative taxonomic study of Pareiorhaphis hystrix (Siluriformes, Loricariidae) suggests a single, yet phenotypically variable, species in south Brazil

“…The star-shaped individual haplotype networks with a central haplotype and additional haplotype starting with a few mutations (genes coI, 16S, 12S), may suggest a recent expansion of the parental haplotype [35][36][37][38]. Moreover, a high number of haplotypes was found considering the relatively small sample in some of the areas, followed by the small nucleotide diversity-few mutations among haplotypes, also corroborating the idea of a recent expansion [39,40].…”

Pattern and Dynamics of Genetic Stock of Freshwater Fishes Using Various Molecular Markers for Their Conservation Management Concerns in the Indian Riverine System

“…Sequence analysis of mitochondrial DNA from seven geographically diverse areas along the Indian coast was used to evaluate the population structure of yellow fin tuna assessed by hierarchical analysis of molecular variance (ΦST=0.03844, P < 0.001 [28]. [32]. The mitochondrial gene and cytochrome b sequences from four populations of C. catla were sequenced and examined to determine the genetic structure of the populations.…”