Historically, the ship sturgeon (Acipenser nudiventris) occurred in Aral, Caspian, Azov, and Black Sea basins. However, its numbers decreased dramatically during 20th century. It is now considered extirpated from Seas, has almost disappeared Caspian Sea. A. nudiventris listed as Critically Endangered on IUCN Red List and, Georgia, species been undetected for last three decades. We collected 22 ...

The range of Shovelnose Sturgeon (SVS) Scaphirhynchus pla-torynchus in the great rivers of central North America has contracted, but most remaining populations are considered stable, likely due to a combination of successful harvest regulations and longitudinal continuity of many river reaches, despite damming in upper reaches. The evolutionary relationships of SVS relative to sister taxa is st...

Studies of innate immunity in fish species of special concern are essential for better understanding of their health status during hatchery rearing conditions. The cytochemical and morphological characterizations of blood granulocytes have been used to provide information about phylogenetic differences and determine the potential use of neutrophil function assays. Rapid, simple, cytochemical st...

 In order to have a sustainable management on Persian sturgeon as a highly commercial species in the South Caspian Sea, we need to identify its population structure and the level as well as its conservation status in their natural habitat. To develop a conservation program for this all Caspian Sea' sturgeon species it requires knowledge of its genetic diversity using reliable molecular marker t...

Sturgeon are fish that considered living fossils. Their ancestors date back over 200 million years, to the same time as dinosaurs. These can grow taller than humans (over 2 m), weigh 160 kg, and live long humans. species have special adaptations, such a vacuum-like mouth body armor called scutes. There 27 of sturgeon worldwide. Two species, green white sturgeon, native California, USA, some lar...

Water projects designed to extract fresh water for local urban, industrial and agricultural use throughout rivers and estuaries worldwide have contributed to the fragmentation and degradation of suitable habitat for native fishes. The number of water diversions located throughout the Sacramento-San Joaquin watershed in California's Central Valley exceeds 3300, and the majority of these are unsc...

Populations of sturgeon (Acipenseridae) are declining in many places in the world because of several potential factors, including overharvesting, habitat alteration, and pollution. In North America, populations of the white sturgeon (Acipenser transmontanus) have been experiencing poor annual recruitment in major river systems for more than three decades. Metal pollution has been hypothesized a...

—Shortnose sturgeon Acipenser brevirostrum, a U.S. endangered species, has experienced a fourfold increase in abundance in the Hudson River in the past three decades. The age structure and trends in year-class strength of yearlings were investigated to evaluate the underlying pattern of annual recruitment that accompanied population recovery. Annuli in pectoral spine sections were used to estim...