The article considers studying the physiological and biochemical parameters of common sprat (Clupeonella delicatula caspia Svetovidov) taken in western part Middle Caspian Sea at different periods annual cycle. There were studied species pre-spawning state, beginning spawning, feeding stage pre-wintering stage. 
 In fish muscle tissue content water-soluble protein total lipids was determin...

Occurrence and distribution of larval and juvenile fish was investigated in nearshore waters of the southeastern Caspian Sea including the Gorgan Bay. Samples were collected during seven surveys using a fine mesh beach-seine in five sampling sites from July 2014 to June 2015. A total of 15500 individuals mostly juvenile were captured, representing 18 species from 8 families. Most juveniles belo...

Abstract The timing of entry into freshwater by mature anadromous fishes is an important component their migration phenology. In iteroparous species, identifying the cues that influence freshwater, and annual variability in these timings, assessing extent individual repeatability. Here, passive acoustic telemetry tracked 71 twaite shad Alosa fallax (‘shad’) returning to River Severn’s upper est...

Identification of the factors that influence susceptibility to predation can aid in developing management strategies to recover fish populations of conservation concern. Predator–prey relationships can be influenced by numerous factors, including prey condition, prey size, and environmental conditions. We investigated these factors by using juvenile steelhead Oncorhynchus mykiss from the Snake ...