this study conducted to provide the status of parasite communities of four sturgeon species viz. acipenser stellatus , a. gueldenstaedtii , a. nudiventris , and huso huso in the southwest of the caspian sea and their histopathological effects on the examined fishes. for this purpose a total of 93 individuals of four sturgeon species were caught in two fisheries regions from the southwest of the...

Sturgeons have a complex free-embryo period extending from hatch to the initiation of exogenous feeding. Although available for some sturgeon species genus Acipenser, descriptions developmental stages free embryos Scaphirhynchus are lacking. We characterised ontogenetic development pallid (Scaphirhynchus albus) and shovelnose (S. platorynchus) through melanin plug expulsion. The rate was simila...

By decreasing of sturgeon stocks in the Caspian Sea, the culture of different sturgeon species especially Huso huso was increased in Iran. Under stress conditions sturgeon can easily be infected by several opportunistic pathogens. In June 2011, mortality happened in 25-28°C water temperature, in one of the most important cultured sturgeon farms in Mazandaran province in the north of Iran. The m...

Characteristics of the in vitro propagation of the white sturgeon iridovirus (WSIV) were examined in 6 sturgeon cell lines. One new cell line originating from gonadal tissues (WSGO) produced up to 12-fold more WSIV [approximately 22 TCID50 (50% tissue culture infective dose) cell-1], than that of a previously established reference spleen cell line (WSS-2). Infected WSGO cell cultures were exami...

The influence of nanoparticles (NPs) on aquatic environments is still poorly documented. The aim of the study was to determine the effects of silver (AgNPs) and copper (CuNPs) nanoparticles on larval Siberian sturgeon (Acipenser baerii) after 21 days of exposure. Acute toxicity of AgNPs on Siberian sturgeon was investigated in a 96-h static renewal study and compared with the toxicity of CuNPs....

Abstract Sturgeon populations are declining worldwide and the target of extensive conservation efforts. Addressed in several pieces legislation, sturgeons have received considerable attention as flagship or umbrella species. Despite need for a better understanding distribution population status, use traditional sampling methods failed past, thereby hampering reliable assessments, prerequisite c...

River thermal regime is a critical factor affecting the initiation of spawning and breeding success in freshwater fish species. The four main domestic carps (FMDCs) Chinese sturgeon are representative warm-water cool-water fishes with different requirements Yangtze Basin, China. This study focused on these two types species below Three Gorges Dam (TGD), response curves were constructed. daily s...

Scott Sturgeon has claimed to undermine the principal argument for Physicalism, in his words, the view that “actuality is exhausted by physical reality” (Sturgeon 1998, p. 410). In noting that actuality is exhausted by physical reality, the Physicalist is not claiming that all that there is in actuality are those things identified by physics. Rather the thought is that actuality is made up of a...

Sustainable management of exploited and endangered species is facilitated by knowledge their geographic genetic structure. Lake sturgeon (Acipenser fulvescens) epitomizes both categories, but information has largely been limited to the Laurentian Great Lakes basin. We assessed hierarchical structure lake across Canadian range using a variation at 14 microsatellite loci. Observed patterns showed...