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Biodiversity is threatened by several factors that are often associated with overfishing, water pollution and hydroelectric dams, among other environmental impacts. The present study aimed to evaluate the genetic aspects of wild groups of Ancherythroculter nigrocauda using the mitochondrial cytochrome c oxidase subunit I (coI) and cytochrome b (cytb) genes and the d-loop region. We collected 89 representative individuals from three geographically distinct ranges of the Upper Yangtze River, including the Longxi River (LOR), Laixi River (LAR), and Hejiang range of the Yangtze River (HJ). The genetic analysis results showed that the three populations of A. nigrocauda had high levels of haplotype diversity (0.3434–0.951) and low levels of nucleotide diversity (0.00074–0.00412) based on the single gene sequences and the combination of gene sequences. Haplotype genealogy showed that only one haplotype (Hap-2) was shared by these three geographic groups, and 2–3 were shared by two groups; the other haplotypes were group-specific. The genetic distance within and between the populations was low; however, most of the molecular variance came from within the populations. Furthermore, high gene flow (>1.0) was found in HJ vs LOR and HJ vs LAR based on the d-loop region sequence and combination. These results suggested that there was a decrease in the degree of A. nigrocauda genetic diversity in the upper Yangtze River, and the genetic protection of the populations should be highlighted in the future. [ABSTRACT FROM AUTHOR]

Aromatase plays a central role in ovarian differentiation and development in teleosts. In the present study, we identified a cyp19a1a homologue from the ovary of Schizothorax prenanti and analysed its expression at both the mRNA and protein levels. Cyp19a1a of S. prenanti showed high homology with that of other teleosts, especially S. kozlovi. The ovary and testis were the main sites of cyp19a1a expression in S. prenanti , and cyp19a1a transcript levels peaked in the mid-vitellogenic (MVG)-stage ovary and the mid-spermatogenic (MS)-stage testis. Signals of Cy p19 a1a immunopositivity were detected in the spermatocytes and follicular cells of cortical alveolar-stage and MVG oocytes but not in spermatogonia or spermatids. Taken together, these findings indicate that Cyp19a1a may play an important role in oocyte vitellogenesis as well as spermatocyte development in S. prenanti. [ABSTRACT FROM AUTHOR]

The complete mitochondrial genome of Ancherythroculter wangi was determined. The mitochondrial genome, consisting of 16,622 base pairs (bp), encoded 13 protein-coding genes, 2 ribosomal RNAs, 22 transfer RNAs and a non-coding control region, as those found in other Ancherythroculter species. These results can provide useful data for further studies on taxonomic status, molecular systematics, and stock evaluation. [ABSTRACT FROM AUTHOR]

In the study, the complete mitochondrial genome ofGymnocypris potaniniHerzensten was sequenced and compared with otherGymnocyprisspecies. The mitochondrial genome, consisting of 16,749 base pairs (bp), encoded 13 protein-coding genes, 2 ribosomal RNAs, 22 transfer RNAs, and a noncoding control region, similar as that found in otherGymnocyprisspecies. These results can provide useful information for further studies on taxonomic status, molecular systematics, and stock evaluation. [ABSTRACT FROM PUBLISHER]

The complete mitochondrial genome ofGymnocypris potanini firmispinatuswas sequenced and compared with othersGymnocyprisspecies. The mitochondrial genome, consisting of 16,680 base pairs (bp), encoded 13 protein-coding genes, 2 ribosomal RNAs, 22 transfer RNAs and a non-coding control region, as those found in otherGymnocyprisspecies. These results can provide useful data for further studies on taxonomic status, molecular systematics and stock evaluation. [ABSTRACT FROM PUBLISHER]

The complete mitochondrial genome of Ancherythroculter wangi was determined. The mitochondrial genome, consisting of 16,622 base pairs (bp), encoded 13 protein-coding genes, 2 ribosomal RNAs, 22 transfer RNAs and a non-coding control region, as those found in other Ancherythroculter species. These results can provide useful data for further studies on taxonomic status, molecular systematics, and stock evaluation., Competing Interests: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of this article., (© 2017 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.)

In the study, the complete mitochondrial genome of Gymnocypris potanini Herzensten was sequenced and compared with other Gymnocypris species. The mitochondrial genome, consisting of 16,749 base pairs (bp), encoded 13 protein-coding genes, 2 ribosomal RNAs, 22 transfer RNAs, and a noncoding control region, similar as that found in other Gymnocypris species. These results can provide useful information for further studies on taxonomic status, molecular systematics, and stock evaluation., Competing Interests: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of this article., (© 2016 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.)

The complete mitochondrial genome of Gymnocypris potanini firmispinatus was sequenced and compared with others Gymnocypris species. The mitochondrial genome, consisting of 16,680 base pairs (bp), encoded 13 protein-coding genes, 2 ribosomal RNAs, 22 transfer RNAs and a non-coding control region, as those found in other Gymnocypris species. These results can provide useful data for further studies on taxonomic status, molecular systematics and stock evaluation., Competing Interests: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of this article., (© 2016 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.)