نتایج جستجو برای: Sturgeons

تعداد نتایج: 248  

2013
Richard Bischof Allen L. Szalanski

Sequencing analysis was used to characterize a mtDNA D-Ioop amplicon of 838 bp. Four pallid sturgeons, Scaphirhynchus albus, and four shovelnose sturgeons, S. platorynchus, from four states (Illinois, Louisiana, Montana, North Dakota) were used for this analysis. DNA sequencing ofthe nine fish revealed eleven polymorphic sites and six distinct haplotypes. No fixed nucleotide substitutions were ...

2003

In this essay, three lines of evidence are developed that sturgeons in the Chesapeake Bay and elsewhere are unusually sensitive to hypoxic conditions: 1. In comparison to other fishes, sturgeons have a limited behavioral and physiological capacity to respond to hypoxia. Basal metabolism, growth, feeding rate, and survival are sensitive to changes in oxygen level, which may indicate a relatively...

2013
Sergey M Rastorguev Artem V Nedoluzhko Alexander M Mazur Natalia M Gruzdeva Alexander A Volkov Anna E Barmintseva Nikolai S Mugue Egor B Prokhortchouk

Legally certified sturgeon fisheries require population protection and conservation methods, including DNA tests to identify the source of valuable sturgeon roe. However, the available genetic data are insufficient to distinguish between different sturgeon populations, and are even unable to distinguish between some species. We performed high-throughput single-nucleotide polymorphism (SNP)-geno...

2016
Alexey Sergeev

Russian ( Acipenser gueldenstaedtii), Persian ( A. persicus) and Siberian ( A. baerii) sturgeons are closely related 'Ponto-Caspian' species. Investigation of their population structure is an important problem, the solution of which determines measures for conservation of these species. According to previous studies, 'baerii-like' mitotypes were found in the Caspian Sea among 35% of Russian stu...

2016
Ekaterina V. Ponomareva Dmitri D. Pervouchine Alexey A. Sergeev

Russian ( ), Persian ( ) and Siberian ( Acipenser gueldenstaedtii A. persicus A. ) sturgeons are closely related ‘Ponto-Caspian’ species. Investigation of baerii their population structure is an important problem, the solution of which determines measures for conservation of these species. According to previous studies, ‘baerii-like’ mitochondrial genotypes were found in the Caspian Sea among 3...

2013
Troy C. Nelson Phaedra Doukakis Steven T. Lindley Andrea D. Schreier Joseph E. Hightower Larry R. Hildebrand Rebecca E. Whitlock Molly A. H. Webb

Worldwide, sturgeons (Acipenseridae) are among the most endangered fishes due to habitat degradation, overfishing, and inherent life history characteristics (long life span, late maturation, and infrequent spawning). As most sturgeons are anadromous, a considerable portion of their life history occurs in estuarine and marine environments where they may encounter unique threats (e.g., intercepti...

2010
Haipeng Cao Shan He Liqun Lu Lundeng Hou

Diseases have been the bottle-neck to sustainable development of sturgeon cultivation. Bacterial septicemia that caused mass mortalities of sturgeons is still prevalent in Shanxi and Yunnan provinces in China. The epidemiology and pathogenicity of the disease were investigated. Four predominant isolates of bacteria were isolated from Siberian sturgeons (Acipenser baerii) suffering from bacteria...

Journal: :General and comparative endocrinology 2006
Karen Jackson Avshalom Hurvitz Svetlana Yom Din Doron Goldberg Oren Pearlson Gad Degani Berta Levavi-Sivan

Sturgeons are known throughout the world as the source of black caviar. Their declining populations in their native habitats, mainly the Caspian Sea, due to over-fishing for meat and caviar production, destruction of their spawning grounds and water pollution, have led to their introduction into aquaculture in areas with suitable conditions, including Israel. Recently, we noticed an unusual phe...

Journal: :Environmental science & technology 2014
Jon A Doering Reza Farmahin Steve Wiseman Sean W Kennedy John P Giesy Markus Hecker

Worldwide, populations of sturgeons are endangered, and it is hypothesized that anthropogenic chemicals, including dioxin-like compounds (DLCs), might be contributing to the observed declines in populations. DLCs elicit their toxic action through activation of the aryl hydrocarbon receptor (AhR), which is believed to regulate most, if not all, adverse effects associated with exposure to these c...

2012
Andreea Dudu Sergiu Emil Georgescu Patrick Berrebi Marieta Costache

Sturgeons are fish species with a complex biology. They are also characterized by complex aspects including polyploidization and easiness of hybridization. As with most of the Ponto-Caspian sturgeons, the populations of Acipenser ruthenus from the Danube have declined drastically during the last decades. This is the first report on mitochondrial point heteroplasmy in the cytochrome b gene of th...

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