The lake sturgeon, Acipenser fulvescens, belongs to one of the few extant nonteleost ray-finned fishes and diverged from the main vertebrate lineage about 250 million years ago. The aim of this study was to use this species to explore the peripheral neural coding strategies for sound direction and compare these results to modern bony fishes (teleosts). Extracellular recordings were made from af...

This study was investigated the effects of dietary estradiol-17? (E2) on growth, body composition and blood indices in Acipenser stellatus. Fish (40.9 ? 1.1 g average initial weight; n = 60 per group) were fed with three different diets containing 0 (control), 25 and 50 mg kg-1 dietary estradiol contents to apparent satiation for seven months. The results suggested that growth rate were decreas...

Population genetic structure of stellate sturgeon (Acipenser stellatus) in 197 adult specimens from four fishery regions along the Iranian coastline of the southern Caspian Sea was investigated using microsatellite markers. Out of 15 microsatellite primers, 11 loci were produced, in which 10 of them were polymorphic and 1 was monomorph. Totally, 184 alleles were identified and on average 13.1 a...

sturgeons are the most important fish in the caspian sea, but there are only a few reports on their parasite communities in the southern part of this sea. in this study, a total of 93 individuals of four sturgeon species, namely acipenser stellatus (n= 60), a.gueldenstaedtii (n = 12), a. nudiventris (n = 9) and huso huso (n = 12), were caught in 2 geographical regions from the southwest of the ...

The pitahaya, pitaya or dragon fruit is an exotic fruit that comes from a type of cactus and has a lot of beneficial nutrients for health. It is a cacti plant, and as such, very resistant to droughts. The plant is a succulent, rustic cactus, with long triangular stems, whose tentacles search the rocks incessantly for which they feel a special predilection, whether there is earth nearby or not; ...

Biological invasion is a pervasive negative force of global change, especially in its effects on sensitive freshwater ecosystems. Even protected areas are usually not immune. Ptychobarbus chungtienensis is a threatened freshwater fish now almost confined to Bita Lake, in the Shangri-La region of Yunnan province, China. Its existence is threatened by the introduction of non-native weatherfishes ...

Water projects designed to extract fresh water for local urban, industrial and agricultural use throughout rivers and estuaries worldwide have contributed to the fragmentation and degradation of suitable habitat for native fishes. The number of water diversions located throughout the Sacramento-San Joaquin watershed in California's Central Valley exceeds 3300, and the majority of these are unsc...