Морфофункциональные особенности органов волжской миноги

Abstract

With habitats shrinking (e.g. due to construction projects that prevent access to areas upper the Volgograd Reservoir), changes in the environment, or illegal fishing in some areas, there is registered a sharp decrease of the population of Volga lamprey. Studying the histomorphological structure of this species has a significant impact on the prediction of changes in the population and on the assessment of the state of their internal organization. Problems in such sections as comparative embryology and histology of Volga lamprey have been poorly studied, which complicates the research. The aim of the research is to study the morphofunctional features of the organs of Caspian lamprey. The object of the study is Caspian (Volga) lamprey (Caspiomyzon wagneri), which is endemic to the Caspian Sea basin. The organs and tissues of lamprey were treated for the study in accordance with the methods generally accepted in histology. Microscopy of fixed, stained preparations was performed using a light microscope with immersion. Lampreys differ from other fish. The structure of the gill apparatus, the skin structural features, the structure of the digestive system organs, the structural features of the organs of the excretory and reproductive systems have been considered. The most intense pathological processes were characteristic of the gills, as the organ actively contacts with the environment. The studied species showed signs of epithelial hyperplasia, vascular disorders, and a change in the shape of lamellae.