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Genetic variation and population structure of northern snakehead ( Channa argus) from eight locations in China were investigated using mitochondrial DNA control region and adjacent regions sequences. Sequence analysis showed that there were 105 haplotypes in 260 individuals, 48 unique haplotypes and 57 shared haplotypes, but no common haplotype shared by all populations. As a whole, the haplotype diversity was high ( h = 0.989), while the nucleotide diversity was low ( π = 0.00482). AMOVA analysis detected significant genetic differentiation among all eight populations ( FST = 0.328, p < 0.01) and 66.17% of the total variance was resulted from intra-population differentiation. UPGMA analysis indicated that the eight populations could be divided into four major clusters, which was consistent with that the eight sampled locations were belonged to four isolated river systems. The neutrality and mismatch distribution tests suggested that the eight populations of C. argus in the sampling locations underwent recent population expansion. Among the eight populations, the Erhai Lake population may represent a unique genetic resource and therefore needs to be conserved. [ABSTRACT FROM AUTHOR]

The complete sequence of the mitochondrial genome ofOphicephalus arguskimurai was determined in this study. The genome was 16,558 bp in length. As in other vertebrates, it consisted of 22 transfer RNA (tRNA) genes, 13 protein-coding genes, 2 ribosomal RNA (rRNA) genes and 1 noncoding control region. The overall base composition was estimated to be A, 27.2%; T, 24.2%; C, 31.6% and G, 17% with AT bias of 51.4%. The genomic composition, organization, and gene order ofO. arguskimurai was similar to that obtained in most vertebrates. These results may provide the basis for the study of genetic structure as well as resource conservation and protection ofO. arguskimurai. [ABSTRACT FROM AUTHOR]

The complete mitochondrial genome of sea carpCyprinus acutidorsaliswas determined in this study. The genome was 16,579 bp in length. As in other vertebrates, it consisted of 13 protein-coding genes, 22 transfer RNA (tRNA) genes, 2 ribosomal RNA (rRNA) genes, and 1 non-coding control region. The overall base composition was estimated to be A, 31.9%; T, 24.8%; C, 27.6% and G, 15.7% with AT bias of 56.7%. The genomic composition, organization, and gene order ofC. acutidorsaliswas similar to most of vertebrates. This result may provide the basis for the study of genetic structure as well as resource conservation and protection ofC. acutidorsalis. [ABSTRACT FROM PUBLISHER]