Abstract The northern section of the Caspian Sea and lower reaches Zhaiyk (Ural) River is an important fishery for Kazakhstan. In present study, a total 1597 individuals ten fish species were analysed. caught over three years, from 2018 to 2020. For each studied – Abramis brama , Alosa saposchnikowii Atherina boyeri caspia Carassius gibelio Chelon auratus Cyprinus carpio Leuciscus aspius Rutilu...

—We present a population dynamics model based on the life history of anadromous Alosa. The model is built around a catch-at-age array to which we have added an additional dimension to include previous spawning history. The previous spawning history determines the number of times that a fish is exposed to riverine impacts that contribute to overall mortality rates. The model is designed to incor...

Contemporary insights from evolutionary ecology suggest that population divergence in ecologically important traits within predators can generate diversifying ecological selection on local community structure. Many studies acknowledging these effects of intraspecific variation assume that local populations are situated in communities that are unconnected to similar communities within a shared r...

The trophic linkage between yellow perch Perca flavescens and two exotic prey items, alewife Alosa pseudoharengus and round goby Neogobius melanostomus, was investigated in the extreme southern area of Lake Michigan during the summer of 2002. Yellow perch 100mm total length, LT (n1⁄4 1293) exhibited size selective feeding, with 148 fish containing round gobies and 120 fish containing alewives. ...

-A full-recovery technique was used in mortality experiments conducted with juveniles of American shad Alosa sapidissima and striped bass Morone saxatilis passed through Ossberger crossflow turbines to obtain antecedent information about their fish passage characteristics. Immediate turbine-induced mortality was 66% for 85-mm-long (total length) American shad. Turbineinduced mortality of stripe...

Juvenile salmon (Oncorhynchus spp.) use of reservoir food webs is understudied. We examined the feeding behavior of subyearling Chinook salmon (O. tshawytscha) and its relation to growth by estimating the functional response of juvenile salmon to changes in the density of Daphnia, an important component of reservoir food webs. We then estimated salmon growth across a broad range of water temper...

Most fish cannot hear frequencies above 3 kHz, but a few species belonging to the subfamily Alosinae (family Clupeidae) can detect intense ultrasound. The response of adult specimens of the European allis shad (Alosa alosa) to sinusoidal ultrasonic pulses at 70 and 120 kHz is tested. The fish showed an intensity-graded response to the ultrasonic pulses with a response threshold between 161 and ...

Walleye (Sander vitreus) are typically associated with shoals, drop offs, or in aquatic vegetation near shore (Foust and Haynes 2007), while in some lakes and reservoirs walleye make more use of pelagic waters (Ager 1976; Festa 1987; Palmer 2005, Byrne et al. 2009). Walleye have been stocked at a target rate of 80,000/year from 2000-2006 and 40,000/year since 2007. Here, walleye occupy rocky sh...