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...

In this study Escherichia coli DE3 containing expression vector (pET21a) with cloned Persian sturgeon growth hormone (psGH) gene was grown in 10 mL LB broth on a 150 rpm shaker, at the temperature of 37 °C. At the late log phase (determined by OD standard curve) 100 &muL isopropyl &beta-D-1-thiogalactopyranoside (IPTG) was added for induction of GH synthesis. Samples were taken every 2 hours an...

sperm morphology, biochemistry and physiology were compared between siberian sturgeon Acipenser baerii and sterlet A. ruthenus in the present study. We observed wide morphological variations between spermatozoa of the two species. the average length of the spermatozoon head was 7.01 and 5.14 μm in A. baerii and A. ruthenus, respectively. Significant differences were observed in terms of Na+, k+...

histopathological and pathomorphological effects of 15 ppb mercuric chloride on persian sturgeon, acipenser persicus, were investigated using histological and electron microscopy observations. light microscopy showed that the gill epithelial hypertrophy, wrinkling and hyperplasia in lamellar epithelia and lamellae fusion occurred after 48 h of exposure. gill epithelia also showed occasional nec...

It is necessary to review changes in the interactions of indicators following construction Three Gorges Dam (TGD) order explore impact dam on ecology. Research among comprehensive social–economic–ecology system Yangtze River Basin limited, and objective this study was investigate how changed after operation TGD, as well contributed change. Here, correlational network approach using 38 data poin...

A study was conducted to determine the relationships between egg and newly hatched larvae Ž . sizes and growth and survival of Siberian sturgeon Acipenser baeri during early stages of development. We hypothesised that this may lead to improved rearing techniques and hatchery Ž . management. Eggs mean size 2.8–4.1 mm were obtained from 20 cultured 13–14 years old Ž . females. There was a positiv...

is a landlocked population restricted to a 270 km stretch of the Kootenai River, which flows from western Montana through northern Idaho and into British Columbia. This population has shown an almost complete lack of natural juvenile recruitment since 1974. The total adult population in 1998 was estimated to be about 650 individuals and this fish is currently classified as endangered by the Ida...

To increase the understanding of lake sturgeon (Acipenser fulvensens) in the upper Mississippi River a radio telemetry study was conducted in Pools 4 through 10. Currently lake sturgeon are listed as a species of concern. GIS analysis of available data was performed to determine the spatial relationships that exist between lake sturgeon and their habitat. Aquatic type, wing dam, revetted dam, a...