Abundance and biomass estimation of this summer individuals of alien fish species in Zaporizke reservoir

O N Marenkov

doi:10.15421/2018_192

Abstract

Substantial changes in the hydroecosystem of the Zaporizke reservoir have led to a significant transformation of aquatic biocoenoses. As a result, number of some aboriginal fish species have decreased. The regulation of the Dnipro river has contributed to the spread of new species of fish. Over the past 30 years, the ichthyofauna of the reservoir has gained about 20 species of fish that acclimatized and expanded their range. The article presents the results of ichthyological research of 2010- 2016. The article determines main causes of the spread of new species of fish, and gives the results of complex monitoring studies on the number and biomass of young alien fish species of the Zaporizke reservoir. It was found that the most numerous first summer individuals of alien fish species are big-scale sand smelt Atherina pontica (Eichwald, 1831), Prussian carp Carassius gibelio (Bloch, 1782), topmouth gudgeon Pseudorasbora parva (Temminck et Schlegel, 1846), black-striped pipefish (Syngnathus abaster Risso, 1826) and pumpkinseed Lepomis gibbosus (Linnaeus, 1758).

Highlights

Under the intensive anthropogenic impact, freshwater ecosystems are most vulnerable ones on the planet (Volke et al, 2015)
Since the Ukrainian reservoirs are the "gate" for biological invasions of Europe's reservoirs, determining the number and biomass of alien species of fish will provide the development of short-term and long-term forecasts for assessing their impact on aboriginal ichthyotcoenoses and determination of their impact on the biological productivity of water bodies (Lotz & Allen, 2013) The results of current researches devoted to the studies of biology, ecology, and spreading of invasive species in multiplepurpose water bodies (Douglas et al, 2015), as well as the socio-economic consequences of biological invasions (Lotz & Allen, 2013)
In the last 30 years the ichthyofauna of the Dnieper has enriched by almost 20 species of fish, which have acclimated, expanded their area and they have their functions in the ecosystem

Summary

Introduction

Under the intensive anthropogenic impact, freshwater ecosystems are most vulnerable ones on the planet (Volke et al, 2015). Since the Ukrainian reservoirs are the "gate" for biological invasions of Europe's reservoirs, determining the number and biomass of alien species of fish will provide the development of short-term and long-term forecasts for assessing their impact on aboriginal ichthyotcoenoses and determination of their impact on the biological productivity of water bodies (Lotz & Allen, 2013) The results of current researches devoted to the studies of biology, ecology, and spreading of invasive species in multiplepurpose water bodies (Douglas et al, 2015), as well as the socio-economic consequences of biological invasions (Lotz & Allen, 2013). The study of the current state of ichthyocenosis for solving important economic issues regarding the conservation, enrichment and rational use of aquatic biological resources is the basis for studying the biodiversity of fish under conditions of continuous invasive process

Methods

Results

Conclusion