Location, abundance, and morphology of gill chloride cells were quantified during changes in osmoregulatory physiology accompanying early development in American shad, Alosa sapidissima. During the larval-juvenile transition of shad, gill chloride cells increased 3.5-fold in abundance coincident with gill formation, increased seawater tolerance, and increased Na(+),K(+)-ATPase activity. Chlorid...

This paper presents the results of a parasitological study on internal parasitic infections in saposhnikovi shad, Alosa saposchnikowii, from the southern part of the Caspian Sea. In this regard 30 fish were studied for abdominal cavity parasites in February 2014. Results showed all of the specimens were infected at least with one kind of parasite and there was no significant difference in paras...

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...

It has recently been shown that a few fish species, including American shad (Alosa sapidissima; Clupeiformes), are able to detect sound up to 180 kHz, an ability not found in most other fishes. Initially, it was proposed that ultrasound detection in shad involves the auditory bullae, swim bladder extensions found in all members of the Clupeiformes. However, while all clupeiformes have bullae, n...

A major challenge in conservation biology is the need to broadly prioritize conservation efforts when demographic data are limited. One method to address this challenge is to use population genetic data to define groups of populations linked by migration and then use demographic information from monitored populations to draw inferences about the status of unmonitored populations within those gr...