The complete mitochondrial genome of olive barb, Systomus sarana sarana (Hamilton, 1822) and its phylogenetic status.

Systomus sarana sarana, commonly known as olive barb, is an important food and ornamental fish species with wide distribution in South Asia. Here, the complete mitogenome was sequenced on HiSeq 2500. With 16,590 nucleotides, the base composition was 32.9% (A), 26% (C), 15.4% (G) and 25.7% (T), comparable with other carps. The clustering pattern depicted the monophyly of S. sarana sarana with sister cyprinids.

Genetic divergence in wild population of endangered yellowtail catfish Pangasius pangasius (Hamilton-Buchanan, 1822) revealed by mtDNA.

Pangasius pangasius, an endangered freshwater fish species, is an important component of capture fishery from Indian rivers. Samples collected through commercial catches from three riverine populations were analyzed with cytb (307 bp) and ATPase6&8 (842 bp) regions for population variation and differentiation. The sequences of the both the mitochondrial regions revealed high haplotype and low nucleotide diversity. Shallow genetic diversity based on ATPase6&8 was observed, however its haplotypes network clearly indicated two distinct mitochondrial lineages. Mismatch distribution suggested population bottlenecks followed by expansion in Mahanadi population. The present study indicated the ATPase6&8 to be a potential mitochondrial marker for studying the population sub-structuring in the wild population of P. pangasius.