sinensis 3-year-old gametogenetic juveniles , and Scaphirhynchus platorynchus
above 2-year-old individuals with fully developed gonads , which could be due to the developmental stage at which the gonads were sampled.
RESULTS--We collected 83 total freshwater drum at 5 sample sites along the lower Missouri River, along with 9 other species of fishes: shovelnose sturgeon (Scaphirhynchus platorynchus
), pallid sturgeon (Scaphirhynchus albus), shortnose gar (Lepisosteus platostomus), goldeye (Hiodon alosoides), common carp (Cyprinus carpio), channel catfish (Ictalurus punctatus), blue catfish (Ictalurus furcatus), flathead catfish (Pylodictis olivaris), and striped bass (Morone saxatilis).
Several papers have been published on spermatozoa motility and its physiological correlation with composition of seminal plasma in sturgeon and teleost species: Siberian sturgeon, Acipenser baerii (13), (16), Shovelnose sturgeon, Scaphirhynchus platorynchus
and Paddlefish, Polydon spathula (17), Lake sturgeon, Acipenser fuvescens (15) and Persian sturgeon, Acipenser persicus (18), Atlantic salmon, Salmo salar (19), Common carp, Cyprinus carpio (20), Bleak, Alburnus alburnus and Rainbow trout, Oncorhynchus mykiss (21), (22), Ctenopharyngodon idella (23), Chinook salmon, Oncorhynchus tshawytscha (24) and Salmo trutta macrostigma (25).
Because the pallid sturgeon is so rare, researchers also study the genetically similar and more abundant shovelnose sturgeon (Scaphirhynchus platorynchus
Jan Dean continues to advance our understanding of the fish by creating a larval identification series, which allows hatchery and field biologists to identify pallid sturgeon in their rapidly changing early-life forms and distinguish them from the more common shovelnose sturgeon (Scaphirhynchus platorynchus
appendix, American brook lamprey 2 1 Acipenseridae Scaphirhynchus platorynchus
, shovelnose sturgeon 4 1 4 Polyodontidae Polyodon spathula, paddlefish 26 Lepisosteidae Lepisosteus oculatus, spotted gar L.
Halfway across the continent, in polluted stretches of the Missouri and Mississippi rivers, Papoulias sees disturbing numbers of "major reproductive pathologies" in adult shovelnose sturgeon (Scaphirhynchus platorynchus
Other fishes collected at the new site included (all common and scientific names follow Nelson et al., 2004): shovelnose sturgeon (Scaphirhynchus platorynchus
), spotted gar (Lepisosteus oculatus), longnose gar (Lepisosteus osseus), shortnose gar (Lepisosteus platostomus), D.
The trawl surveys are being used to identify pallid sturgeon (Scaphirhynchus albus) and shovelnose sturgeon (Scaphirhynchus platorynchus
) habitat use over a range of river stages and conditions in the vicinity of Vicksburg, Mississippi.
appendix (DeKay), American NW brook lamprey Petromyzon marinus Linnaeus, sea NW lamprey Order Acipenseriformes (paddlefish, strugeons) Family Acipenseridae (sturgeon) Acipenser fulvescens Rafinesque, W, S lake surgeon Scaphirhynchus platorynchus
W, SE (Rafinesque), shovelnose sturgeon Family Polyodontidae (paddlefish) Polyodon spathula (Walbaum), W, SE paddlefish Order Lepisosteiformes (gars) Family Lepisosteidae (gars) Lepisosteus oculatus Winchell, NE, SW spotted gar L.
Food and feeding behavior of the shovelnose sturgeon, Scaphirhynchus platorynchus
, in the unchannelized Missouri River, South Dakota.
Nevertheless, in that year, the only specimens of the shovelnose sturgeon (Scaphirhynchus platorynchus
) ever collected from the Rio Grande were taken at Albuquerque (Cope and Yarrow, 1875), perhaps signaling the end of an era because development proceeded rapidly throughout the late 19th century and withdrawals for irrigation largely depleted the Rio Grande by 1900 (Kelley, 1986; Scurlock, 1998).