Current status and catch of Siberian taimen (Hucho taimen) in the lower Amur River

Золотухин, С. Ф.

doi:10.2478/aopf-2013-0019

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…Internationally, many of the challenges facing Mongolian salmonids are also impacting these species throughout their distributions in both Russia and China, with perturbations occurring at a far greater intensity due to higher human population densities, a more established fishing culture, lack of comprehensive fisheries management strategies and increased large‐scale infrastructure river development projects (Knizhin and Weiss (); Tong, Kuang, Yin, & Zhang, ; Zolotukhin, ). As a result, populations of these species have suffered from even more dramatic losses with H. taimen having gone locally extinct or suffered from significant declines in 39 out of the 57 river basins assessed throughout Russia (M. Skopets unpubl.…”

Section: Discussionmentioning

confidence: 99%

“…Additionally with this new understanding, future translocations or introductions of genetically dissimilar individuals can be avoided and inbreeding minimized within the remaining fragmented populations (Balakirev, Romanov, Mikheev, & Ayala, 2013;Hänfling, Durka, & Brandl, 2004;Hänfling & Weetman, 2006;McDougall, Welsh, Gosselin, Anderson, & Nelson, 2017;Slynko et al, 2015). However, in order to improve the outcomes Internationally, many of the challenges facing Mongolian salmonids are also impacting these species throughout their distributions in both Russia and China, with perturbations occurring at a far greater intensity due to higher human population densities, a more established fishing culture, lack of comprehensive fisheries management strategies and increased large-scale infrastructure river development projects (Knizhin and Weiss (2009);Tong, Kuang, Yin, & Zhang, 2013;Zolotukhin, 2013). As a result, populations of these species have suffered from even more dramatic losses with H. taimen having gone locally extinct or suffered from significant declines in 39 out of the 57 river basins assessed throughout Russia (M. Skopets unpubl.…”

Section: Con Clus Ionsmentioning

confidence: 99%

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Fish conservation in the land of steppe and sky: Evolutionarily significant units of threatened salmonid species in Mongolia mirror major river basins

Kaus

Michalski

Hänfling

et al. 2019

Ecology and Evolution

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Mongolia's salmonids are suffering extensive population declines; thus, more comprehensive fisheries management and conservation strategies are required. To assist with their development, a better understanding of the genetic structure and diversity of these threatened species would allow a more targeted approach for preserving genetic variation and ultimately improve long‐term species recoveries. It is hypothesized that the unfragmented river basins that have persisted across Mongolia provide unobstructed connectivity for resident salmonid species. Thus, genetic structure is expected to be primarily segregated between major river basins. We tested this hypothesis by investigating the population structure for three salmonid genera (Hucho, Brachymystax and Thymallus) using different genetic markers to identify evolutionarily significant units (ESUs) and priority rivers to focus conservation efforts. Fish were assigned to separate ESUs when the combined evidence of mitochondrial and nuclear data indicated genetic isolation. Hucho taimen exhibited a dichotomous population structure forming two ESUs, with five priority rivers. Within the Brachymystax genus, there were three B. lenokESUs and one B. tumensisESU, along with six priority rivers. While B. tumensiswas confirmed to display divergent mtDNA haplotypes, haplotype sharing between these two congeneric species was also identified. For T. baicalensis,only a single ESU was assigned, with five priority rivers identified plus Lake Hovsgol. Additionally, we confirmed that T. nigrescens from Lake Hovsgol is a synonym of T. baicalensis. Across all species, the most prominent pattern was strong differentiation among major river basins with low differentiation and weak patterns of isolation by distance within river basins, which corroborated our hypothesis of high within‐basin connectivity across Mongolia. This new genetic information provides authorities the opportunity to distribute resources for management between ESUs while assigning additional protection for the more genetically valuable salmonid rivers so that the greatest adaptive potential within each species can be preserved.

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Section: Discussionmentioning

confidence: 99%

Section: Con Clus Ionsmentioning

confidence: 99%

Fish conservation in the land of steppe and sky: Evolutionarily significant units of threatened salmonid species in Mongolia mirror major river basins

Kaus

Michalski

Hänfling

et al. 2019

Ecology and Evolution

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“…The median home range estimate across all seasons for Onon-Balj taimen was 18.2 km (n ¼ 10), while for those individuals that were detected for eight months or more the median home range was 27.7 km (n ¼ 6). It is essential to increase coordination and cooperation between Mongolian, Russian and Chinese authorities to adequately protect the threatened Amur-Heilong River basin taimen, especially as downstream populations are facing even greater declines (Zolotukhin, 2013). Even though the median home range size for Onon-Balj River taimen was more than double that of the median home range size reported for the Eg-Urr River taimen population (13.8 km) by Gilroy et al (2010), there was no statistical difference identified between these river basin populations (Wilcox sign rank test p > 0.05).…”

Section: Discussionmentioning

confidence: 99%

“…In any case, there must be an emphasis on the need to apply management and conservation efforts on the same extensive scale, which is especially difficult for such transboundary rivers as the Onon and Amur. It is essential to increase coordination and cooperation between Mongolian, Russian and Chinese authorities to adequately protect the threatened Amur-Heilong River basin taimen, especially as downstream populations are facing even greater declines (Zolotukhin, 2013).…”

Section: Discussionmentioning

confidence: 99%

Seasonal home range shifts of the Siberian taimen (Hucho taimenPallas 1773): Evidence from passive acoustic telemetry in the Onon River and Balj tributary (Amur River basin, Mongolia)

Kaus

Büttner

Schäffer

et al. 2016

Internat. Rev. Hydrobiol.

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Hucho taimen, the world's largest salmonid, is a potadromous species that is listed as endangered in Mongolia. While mature individuals are known to have extended longitudinal movements of over 90 km along main river channels, details of the seasonal movements and residency of individuals within and between tributary habitats have been largely undocumented. Therefore, the current research aimed to detect and quantify the seasonal distances moved by adult taimen (65–96 cm; n = 10) within and between the Onon River (Amur River basin) and a major tributary (Balj) over 12 months using passive acoustic telemetry. The median distance moved by taimen in spring was 17.4 km (n = 6), in summer 9.1 km (n = 4), autumn 4.7 km (n = 9) and winter 0.4 km (n = 8). However, there were no statically significant differences amongst these median seasonal home range sizes. Two taimen traversed between the Onon River and the Balj tributary during the study period, recording overall home ranges of 44.5 km and 126.1 km. One of these individuals moved twice, exiting the tributary in autumn and returning again in spring where it remained for 36 days, while the second taimen moved only once into the tributary in spring and re‐entered the main channel in late summer after 85 days. Another two taimen entered surrounding smaller tributaries and recorded home ranges of 26.1 km and 29.2 km, while all remaining individuals were detected moving only within the waterway where they were originally captured and released (0.8–20.1 km). Taimen movements within tributaries such as the Balj can be extensive (<60 km), as they provide access to important spawning, feeding and overwintering habitats as well as refuge from adverse thermal and hydrological conditions. Thus to enhance population recovery, it is essential that current and future management and conservation efforts include preserving or restoring the ecological integrity and hydrological connectivity of these critical tributaries and the main river channel throughout the Onon and Amur River basins and across the remaining distribution of this endangered species.

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De novo assembly and characterization of the Hucho taimen transcriptome

Tong

Xü

Zhang

et al. 2017

Ecology and Evolution

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Taimen (Hucho taimen) is an important ecological and economic species that is classified as vulnerable by the IUCN Red List of Threatened Species; however, limited genomic information is available on this species. RNA‐Seq is a useful tool for obtaining genetic information and developing genetic markers for nonmodel species in addition to its application in gene expression profiling. In this study, we performed a comprehensive RNA‐Seq analysis of taimen. We obtained 157 M clean reads (14.7 Gb) and used them to de novo assemble a high‐quality transcriptome with a N50 size of 1,060 bp. In the assembly, 82% of the transcripts were annotated using several databases, and 14,666 of the transcripts contained a full open reading frame. The assembly covered 75% of the transcripts of Atlantic salmon and 57.3% of the protein‐coding genes of rainbow trout. To learn about the genome evolution, we performed a systematic comparative analysis across 11 teleosts including eight salmonids and found 313 unique gene families in taimen. Using Atlantic salmon and rainbow trout transcriptomes as the background, we identified 250 positive selection transcripts. The pathway enrichment analysis revealed a unique characteristic of taimen: It possesses more immune‐related genes than Atlantic salmon and rainbow trout; moreover, some genes have undergone strong positive selection. We also developed a pipeline for identifying microsatellite marker genotypes in samples and successfully identified 24 polymorphic microsatellite markers for taimen. These data and tools are useful for studying conservation genetics, phylogenetics, evolution among salmonids, and selective breeding for threatened taimen.

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Current status and catch of Siberian taimen (Hucho taimen) in the lower Amur River

Cited by 5 publications

References 5 publications

Fish conservation in the land of steppe and sky: Evolutionarily significant units of threatened salmonid species in Mongolia mirror major river basins

Fish conservation in the land of steppe and sky: Evolutionarily significant units of threatened salmonid species in Mongolia mirror major river basins

Seasonal home range shifts of the Siberian taimen (Hucho taimenPallas 1773): Evidence from passive acoustic telemetry in the Onon River and Balj tributary (Amur River basin, Mongolia)

De novo assembly and characterization of the Hucho taimen transcriptome

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