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Based upon the morphological characters, the genusTriplophysa(plateau Loach) is a highly diverse group in the family Balitoridae (or Cypriniformes, Cobitoidea) with 133 valid species. Therefore, the taxonomic relationship of this species at the genetic level remains ambiguous. In the present study, we sequenced the complete mitochondrial genome ofTriplophysa dorsalis. In order to understand its position and genetic background at the gene level, the characteristics of mitochondrial DNA sequences and phylogenetic relationship were examined. The mitochondrial genome ofT. dorsalisis similar to those of the typical vertebrates, 16 572 bp in length, including 13 protein-coding genes, 2 ribosomal RNA genes, 22 transfer RNA genes, and a non-coding control region (D-loop). All genes were encoded on the heavy strand except forND6and 8 tRNA genes. The overall base composition of the heavy strand was 28.16%, 28.41%, 25.62% and 17.82% for A, T, C and G, respectively. Phylogenetic analyses showed that the sevenTriplophysaspecies clustered together withT. dorsalisto form a sister group withTriplophysa strauchii, T. bleekeri, T. stoliczkaiandT. bombifrons. The two generaTriplophysaandBarbatulaformed a sister-group relationship, the speciesHomatula potaninilocated in the intermediate position, and the genusLeptobotia elongatawas in the basal position in the subfamily Nemacheilidae. Further investigations with moreTriplophysaspecies need to be performed for better understanding of the evolutionary history of this fascinating genus. [ABSTRACT FROM AUTHOR]

In the present work, the complete mitochondrial genome of theTriplophysa strauchii(Cypriniformes: Cyprinidae, Balitoridae, Cobitoidea) is sequenced and placed, the phylogenetic analysis with another individual ofTriplophysafishes was carried out. The mitogenome is 16,590 bp in length, consisting 13 protein genes, 22 tRNA genes, 2 rRNA genes, and 2 non-coding regions. The total base composition is 28.26%, 28.49%, 25.42% and 17.82% for A, T, C and G, respectively. All genes were encoded on the heavy strand except for ND6 and 8 tRNA genes. These results will provide useful data for species identification and genetic study ofTriplophysafishes. [ABSTRACT FROM AUTHOR]

As reported, previous studies ofPhoxinus phoxinus ujmonensis(Cypriniformes: Cyprinidae) have focused primarily on morphology and ecology. In this study, we cloned and sequenced the complete nucleotide sequence of the mitochondrial genome forP. phoxinus ujmonensis. The mitogenome was 17,738 bp in length, including 13 protein-coding genes, 22 transfer RNA genes, 2 ribosomal RNA genes and 1 control region. All genes were encoded on the heavy strain except for ND6 and eight tRNA genes. The overall base composition of the heavy strain was 28.50% for A, 28.24% for T, 25.32% for C and 17.94% for G. The control region was revealed to contain tandem repeats. The mitogenome data ofP. phoxinus ujmonensisshould contribute to phylogenetic analysis and studies of population genetics ofPhoxinusfishes. [ABSTRACT FROM AUTHOR]

In this study, we determined the complete nucleotide sequence of the mitochondrial genome for a cold water fish,Leuciscus idus. The complete mitochondrial genome was sequenced and analyzed using the primer walking method and 30 pairs of newly designed primers were used. Direct sequencing of the PCR products demonstrated that the genome contained the same 37 mitochondrial genes (two ribosomal RNA, 22 transfer RNA and 13 protein-coding genes) and two main non-coding regions (the control region and the origin of the light strand replication) as those found in other vertebrates. Nearly all the protein-coding genes’ start codons were ATG exceptCOX 1, meanwhile, the termination codons of which varied with TAA, TA, T, or TAG. [ABSTRACT FROM AUTHOR]