Ship Sturgeon Acipenser Nudiventris Research Articles

Rare but Not Gone: A Relict Population of the Black Sea Ship Sturgeon Acipenser nudiventris Persists in the Rioni River, Georgia

Historically, the ship sturgeon (Acipenser nudiventris) occurred in the Aral, Caspian, Azov, and Black Sea basins. However, its numbers decreased dramatically during the 20th century. It is now considered extirpated from the Aral, Azov, and Black Seas, and has almost disappeared in the Caspian Sea. A. nudiventris is listed as Critically Endangered on the IUCN Red List and, in Georgia, the species has been undetected for the last three decades. We collected 22 sightings, including nine genetic samples taken from fin clips of ship sturgeon from the Rioni River in Georgia during 2020–2022. For the genetic samples, the mitochondrial DNA control region was used for species identification. Because cases of sturgeon inter-species hybridization have been reported in the Rioni River, we used species-specific diagnostic markers and ship sturgeon-specific microsatellite markers for detecting hybridization with other sturgeon species. In addition, we used a sex-specific marker for sex identification. Based on the maternal identification, all nine individuals are identified as ship sturgeon, representing one haplotype, and the haplotype is different from all other A. nudiventris haplotypes available in GenBank. Based on genetic analysis, the specimens did not show signs of hybridization with other locally occurring species. We conclude that ship sturgeon still live in the Rioni River, and are a remnant of an older, preexisting Black Sea ship sturgeon population.

Complete mitochondrial genomes of the critically endangered Ship sturgeon Acipenser nudiventris from two seas

Two complete mitochondrial genome sequences of ship sturgeon Acipenser nudiventris from the Caspian Sea and from Balkhash Lake (introduced from the Aral Sea during the last century) were determined by PCR-based sequencing method. The whole mitogenome sequences have been deposited in GenBank under accession numbers KU321568 and KU321569.

Effects of Salinity Changes on Hematological Responses in Juvenile Ship Sturgeon Acipenser nudiventris

A 10-day trial was conducted to evaluate the salinity tolerance and hematological responses of juvenile ship sturgeon Acipenser nudiventris under different salinity levels. A total of 240 fish averaging <TEX>$6.2{\pm}0.13g$</TEX> (mean<TEX>${\pm}$</TEX>SD) were randomly distributed into 12 tanks in groups of 20, and each tank was then randomly assigned to one of three replicates of four different salinities at 0, 4, 8 and 12‰. At the end of 10 days of experimental period, plasma protein value of fish exposed to 0‰ and 4‰ salinities was significantly higher than those of fish exposed to 8‰ and 12‰ salinities (P < 0.05). Significantly higher values for plasma cortisol and glucose were obtained in fish exposed to 12‰ salinity compared to the fish exposed to 0‰ and 4‰ salinities (P < 0.05). Plasma potassium and sodium values increased significantly by increment of salinity levels (P < 0.05). Therefore, these results indicated that in natural environments, juvenile ship sturgeon, A. nudiventris in migratory populations could be able to migrate and adjust successfully into brackish water with a salinity of up to 8‰ without any short-term hematological stress responses.

Induction of meiotic gynogenesis in ship sturgeon Acipenser nudiventris using UV-irradiated heterologous sperm

Diploid gynogenesis was induced in ship sturgeon Acipenser nudiventris using UV-irradiated sperm from Siberian sturgeon Acipenser baerii. The optimal condition for the retention of the second polar body in ship sturgeon was determined to be 10min after activation/fertilization in experiments. The temperature of cold shock and its duration were 2.5°C and 30min, respectively. A total of 30 gynogens of known parentage from experimental treatments were screened using microsatellite DNA analysis, and uniparental transmission in meiogens was confirmed. The results show that heterologous Siberian sturgeon sperm is applicable as UV-irradiated sperm for the induction of gynogenesis in ship sturgeon. This technique may recover the critically endangered sturgeon species that are becoming extinct.

Karyotype analysis in ship sturgeon Acipenser nudiventris in the south Caspian Sea using leukocyte culture

Journal of Applied IchthyologyVolume 22, Issue s1 p. 97-98 Karyotype analysis in ship sturgeon Acipenser nudiventris in the south Caspian Sea using leukocyte culture M.R. Nowruzfashkhami, M.R. NowruzfashkhamiSearch for more papers by this authorS. Safaiian, S. SafaiianSearch for more papers by this authorM. Bahmani, M. BahmaniSearch for more papers by this authorF. Chubian, F. ChubianSearch for more papers by this author M.R. Nowruzfashkhami, M.R. NowruzfashkhamiSearch for more papers by this authorS. Safaiian, S. SafaiianSearch for more papers by this authorM. Bahmani, M. BahmaniSearch for more papers by this authorF. Chubian, F. ChubianSearch for more papers by this author First published: 10 July 2007 https://doi.org/10.1111/j.1439-0426.2007.00934.xCitations: 2AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article.Citing Literature Volume22, Issues1December 2006Pages 97-98 RelatedInformation