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On pallid sturgeon, the two inner barbels are about half as long as the outer ones, while on the shovelnose sturgeon, all four barbels are the same length. [7] The inner barbels of the pallid sturgeon are positioned in front of the outer ones, but those on the shovelnose sturgeon are all located in essentially a straight line.
Scaphirhynchus is a genus of sturgeons native to North America. All species in this genus are considered to be threatened with extinction or worse. [2] [3] [4] As of 2023, the pallid sturgeon (S. albus) [3] and the Alabama sturgeon (S. suttkusi) [4] are critically endangered according to the International Union for Conservation of Nature.
Pallid sturgeon, Scaphirhynchus albus [84] Shovelnose sturgeon, Scaphirhynchus platorynchus [85] The three types of sturgeon native to Arkansas are uncommon, and two of the species are listed as endangered nationwide. The lake sturgeon is near the southern end of its range in Arkansas, more commonly found in the Upper Midwest. [86]
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A study published in 2020 reported a successful hybridization between a Russian sturgeon (Acipenser gueldenstaedtii) and an American paddlefish (Polyodon spathula), indicating that the two species can breed with one another despite their lineages having been separated for hundreds of millions of years.
The pallid sturgeon is an ancient fish native to the Missouri and Mississippi Rivers. The fish was listed as an endangered species in the 1990s.