EPISOOTOLOGICAL SUPERVISION AND EXPERT ASSESSMENT OF THE VERIFICATION OF THE SURA RIVER ICHTHYOFAUNA, ITS EPISOOTIC AND BIOLOGICAL SAFETY | ЭПИЗООТОЛОГИЧЕСКИЙ НАДЗОР И ЭКСПЕРТНАЯ ОЦЕНКА ВЕРИФИКАЦИИ ИХТИОФАУНЫ РЕКИ СУРЫ, ЕЕ ЭПИЗООТИЧЕСКОЙ И БИОЛОГИЧЕСКОЙ БЕЗОПАСНОСТИ
2023
V. V. Sochnev | N. G. Gorchakova | P. A. Gorbunov | M. V. Romanova | Y. V. Pashkina | N. V. Morozov | O. V. Kozyrenko | S. N. Dedov | В. В. Сочнев | Н. Г. Горчакова | П. А. Горбунов | М. В. Романова | Ю. В. Пашкина | Н. В. Морозов | О. В. Козыренко | С. Н. Дедов
Sura belongs to the rivers of the highest category of fishery water use. The river lies entirely within the Volga Upland, in the west it adjoins the Oka's basin. The biodiversity of native fish species is decreasing, as a result of anthropogenic impact. It is very important to determine the modern ichthyofauna of the river, to trace the dynamic processes there. The work uses a complex epizootological approach, methods of epizootological diagnostics: factography, expert assessments and verification. It was found that the Sura's hydrochemical regime is characterized by an increased value of water hardness and salinity and is mainly caused by natural factors. It was confirmed that the indicators of the quantitative development of planktonic algae into the Sura at most sampling stations correspond to the mesotrophic level. In terms of the content of zooplankton, Sura is characterized as a reservoir of low food for fish and high food for benthofauna. An expert assessment of the study results of the ichthyofauna of the Sura in its different areas using various fishing gear was carried out. The total number of fish species living in the Sura has 46 species. In the ichthyofauna of the river in the Nizhny Novgorod water area, according to the data of the Nizhny Novgorod branch of the (FSBSU) "All-Russian Research Institute of Fisheries and Oceanography", 21 fish species were recorded. It has been established that mainly non-commercial fish species (roach, bleak, ruff, gudgeon, rudd) dominate in the catches. The production indicators of the ichthyofauna in all parts of the river are quite high. The epizootic well-being of the ichthyofauna and the biological safety of the region are supported.
Afficher plus [+] Moins [-]Mots clés AGROVOC
Informations bibliographiques
Cette notice bibliographique a été fournie par Don State Technical University
Découvrez la collection de ce fournisseur de données dans AGRIS