Open AccessFEATURES OF GILL FORMATION IN ROACH FRY ON SPAWNING GROUNDS OF THE VOLGA DELTA
Author(s) -
Nadezhda Yurievna Terpugova,
Maria Pavlovna Grushko,
Nadezhda Nickolaevna Fedorova
Publication year - 2019
Publication title -
vestnik astrahanskogo gosudarstvennogo tehničeskogo universiteta. seriâ: rybnoe hozâjstvo
Language(s) - English
Resource type - Journals
eISSN - 2309-978X
pISSN - 2073-5529
DOI - 10.24143/2073-5529-2019-2-66-71
Subject(s) - gill , biology , lamella (surface anatomy) , delta , larva , protein filament , metamorphosis , zoology , ecology , anatomy , fishery , fish <actinopterygii> , genetics , engineering , aerospace engineering
The article focuses on the influence of anthropogenic load initiating multidirectional metamorphosis of biological processes in the aquatic organisms in the Volga delta. The gill apparatus responds primarily to the environmental changes. There has been carried out a histological study of the gill apparatus of carp species, actually, late larvae and early roach fry, which helps to identify and describe the ecological situation on the spawning grounds in the Volga delta. Various morphological changes in the gills indicating respiratory disturbances were revealed. The late roach larvae and fry have been found to obtain the overgrown respiratory epithelium on the lamella tops, proliferation of multilayered non-keratinizing epithelium, vasodilation, deformation and curvature of the cartilage plate and filaments, lack of lamellae, joining of the side surfaces and filament hemorrhage. It has been stated that in comparison with the larval stages of development, in the fry period the occurrence of the respiratory epithelium accretion increases. The changes found in the gill apparatus of the examined roach larvae and fry indicate the unsatisfied physiological state of the fish in some water bodies of the Volga delta. This is explained by the fact that the gills suffer from the direct impact of the negative factors of the aquatic environment including different pollutants in the flooded water bodies.