Sturgeon (family Acipenseridae) are regarded as living fossils due to their ancient origin and exceptionally slow evolution. To extend our knowledge of fish cardiac excitability to a Chondrostei fish, we examined electrophysiological phenotype of the Siberian sturgeon (Acipenser baerii) heart with recordings of epicardial ECG, intracellular action potentials (APs), and sarcolemmal ion currents....

The conservation status of sturgeon species is highly alarming. Six the European Acipenser are critically endangered. Several studies developed in last decades have analysed distribution sturgeons Iberian Peninsula, questioning possibility native character some there, with a special focus on Adriatic sturgeon, A. naccarii. We review available knowledge sturgeons, order to ascertain their native...

A targeted commercial fishery for Atlantic Sturgeon Acipenser oxyrinchus once operated in the New York Bight, where it was assumed that most harvested were natal to Hudson River population. However, more recent evidence suggests may have been targeting a mixed-stock aggregation, which case could comprised of individuals from multiple populations throughout species’ range. Although there is now ...

Abstract The shovelnose sturgeon ( Scaphirhynchus platorynchus ) and endangered pallid S. albus deposit demersal adhesive eggs in swift currents, near or over coarse substrate. Hydrographic surveys have demonstrated the dynamic nature of spawning habitats that substrates may episodically be buried (partially completely) by fine sediments. To evaluate embryo survival both species various substra...

Epidermal, branchial and digestive mucous cells, and the gastric glands of larvae/postlarvae (from hatching until 45 days posthatching) of three fish species (two teleostean and a chondrostean) were investigated using conventional histochemical methods (periodic acid schiff -PAS-, diastase-PAS; alcian blue pH 0.5, 1 and 2.5) in order to distinguish neutral and acidic (carboxylated and sulphated...

The present work reports behavioural responses by young-of-the-year (21-30 cm) Atlantic sturgeon Acipenser oxyrinchus oxyrinchus and shortnose sturgeon Acipenser brevirostrum to nine binary combinations of dissolved oxygen saturation (40, 70 and 100%), temperature (12, 20 and 28°C) and salinity (1, 8 and 15). Both species showed no acclimation effects and similar discrimination and avoidance re...

Estimations of a poaching catch in the Amur estuary for kaluga and amur sturgeon are presented. Total illegal these species 2011 2016 is amounted as 8,300 15,060 ind. or 409.1 745.0 t, respectively. The volume on exceeded 1–2 orders (in 26–268 times) legal research purposes artificial reproduction. relatively stable through decades.

The purpose of the present study was to isolate and identify the pathogenic agents in Acipenser stellatus (Pallas, 1771) and Huso huso, (Linnaeus, 1758) reared in the south of Fars province, Iran which have shown infectious disease signs. Samples from spleen and kidney of 32 fishes showing septicemia symptoms such as decreasing of appetite, unbalanced swimming, expanded wounds...

This study quantified the effects of temperature and fish mass on routine metabolism of the American paddlefish Polyodon spathula. Thermal sensitivity, as measured by Q(10) value, was low in P. spathula. Mean Q(10) was 1·78 while poikilotherms are generally expected to have Q(10) values in the 2·00-2·50 range. Mass-specific metabolism did not decrease with increased fish size to the extent that...