scholarly journals Topicality of native fish fauna reproduction of Ukraine reservoirs

2016 ◽  
Vol 18 (2) ◽  
Author(s):  
P. Ya. Pukalo ◽  
L. M. Darmohray ◽  
L. Ya. Bozhyk ◽  
N. Ya. Vaseruk
Keyword(s):  
Aquatic Ecosystems ◽  
River Flow ◽  
Fish Fauna ◽  
Native Fish ◽  
Anthropogenic Activity ◽  
Biological Productivity ◽  
Migration Routes ◽  
Negative Effects ◽  
Danube Salmon ◽  
Determining Factor

Conservation of natural aquatic ecosystems rich in native fauna, is important in the sense what we pass on a legacy to future generations. The determining factor in ecosystems formation, including the ecosystems of rivers, is river flow. It influences on level of aquatic environment resistance to the anthropogenic activity, on self–purification process and biological productivity, species composition, quantity of hydrobiota, in particular of ichthyophauna. Human impact on the functioning of natural hydroecosystems and increased human press, interference into stable hydrological parameters of reservoirs, fishing increasing and fishing gears improving have led to the extinction of some species and reduction of others. Ways of such intervention were diverse: construction of hydropower facilities have led to the fragmentation of rivers channels and violation of migration routes of semi– and anadromous fish; not qualified hydrotechnical  works destroyed spawning and wintering pit. Prevention of negative effects of human activity has social, economic and environmental values and will promote the conservation native fish fauna biodiversity of inland waters and the possibility of further expanding the range of delicious fish products. An introduction of such fish as sturgeon, beluga, Danube salmon, grayling and vyrezub in aquaculture should help the positive solution of this problem in Ukraine.

scholarly journals Advancing improvement in riverine water quality caused a non-native fish species invasion and native fish fauna recovery

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Łukasz Głowacki ◽  
Andrzej Kruk ◽  
Tadeusz Penczak
Keyword(s):  
Water Quality ◽  
Fish Species ◽  
Native Species ◽  
Interference Competition ◽  
Fish Fauna ◽  
Species Traits ◽  
Native Fish ◽  
Biological Degradation ◽  
Species Invasion ◽  
Prussian Carp

AbstractThe knowledge of biotic and abiotic drivers that put non-native invasive fishes at a disadvantage to native ones is necessary for suppressing invasions, but the knowledge is scarce, particularly when abiotic changes are fast. In this study, we increased this knowledge by an analysis of the biomass of most harmful Prussian carp Carassius gibelio in a river reviving from biological degradation. The species' invasion followed by the invasion's reversal occurred over only two decades and were documented by frequent monitoring of fish biomass and water quality. An initial moderate improvement in water quality was an environmental filter that enabled Prussian carp’s invasion but prevented the expansion of other species. A later substantial improvement stimulated native species’ colonization of the river, and made one rheophil, ide Leuciscus idus, a significant Prussian carp’s replacer. The redundancy analysis (RDA) of the dependence of changes in the biomass of fish species on water quality factors indicated that Prussian carp and ide responded in a significantly opposite way to changes in water quality in the river over the study period. However, the dependence of Prussian carp biomass on ide biomass, as indicated by regression analysis and analysis of species traits, suggests that the ecomorphological similarity of both species might have produced interference competition that contributed to Prussian carp’s decline.

Survival of fish passing downstream at a small hydropower facility

2018 ◽  
Vol 69 (12) ◽  
pp. 1870 ◽  
Author(s):  
Stephen V. Amaral ◽  
Benjamin S. Coleman ◽  
Jenna L. Rackovan ◽  
Kelly Withers ◽  
Benjamin Mater
Keyword(s):  
Mississippi River ◽  
River Flow ◽  
Survival Rates ◽  
Fish Populations ◽  
Negative Effects ◽  
Small Hydropower ◽  
The Usa ◽  
Pass Through ◽  
Hydro Project ◽  
Total Project

Hydropower dams can negatively affect upstream and downstream migratory fish populations in many ways, such as blocking access to upstream habitats and causing injuries or mortality during downstream passage. For downstream passage at projects in the USA, federal regulators and agencies responsible for oversight of hydropower facilities typically require assessment studies and mitigation to address negative effects, with a primary goal of minimising fish impingement and turbine entrainment and mortality. So as to assess the effects of downstream passage of fish populations at a unique, small hydro project on the Mississippi River, impingement and entrainment rates, Oberymeyer gate passage, spillway gate passage, turbine survival, and total downstream passage survival were estimated. It was determined that 85% of fish passing downstream at the project would be small enough to pass through the bar spacing of the trash racks and 15% would be physically excluded. When 55% of river flow enters the turbine intake channel, the total project survival rates were estimated to be 77.3% with an Obermeyer gate bypass rate of 10 and 96.6% with a gate bypass rate of 90%. Therefore, any effects on local fish populations resulting from the operation of the project are expected to be negligible and inconsequential on the basis of expected survival rates for the range and probability of river flows occurring at the project.

scholarly journals Phytoremediation of Toxic Metals: A Sustainable Green Solution for Clean Environment

2021 ◽  
Vol 11 (21) ◽  
pp. 10348
Author(s):  
S. M. Omar Faruque Babu ◽  
M. Belal Hossain ◽  
M. Safiur Rahman ◽  
Moshiur Rahman ◽  
A. S. Shafiuddin Ahmed ◽  
...  
Keyword(s):  
Aquatic Ecosystems ◽  
Extended Period ◽  
Cost Effective ◽  
The Body ◽  
Species Selection ◽  
Environmentally Benign ◽  
Soil Parameters ◽  
Negative Effects ◽  
Clean Environment ◽  
Green Solution

Contamination of aquatic ecosystems by various sources has become a major worry all over the world. Pollutants can enter the human body through the food chain from aquatic and soil habitats. These pollutants can cause various chronic diseases in humans and mortality if they collect in the body over an extended period. Although the phytoremediation technique cannot completely remove harmful materials, it is an environmentally benign, cost-effective, and natural process that has no negative effects on the environment. The main types of phytoremediation, their mechanisms, and strategies to raise the remediation rate and the use of genetically altered plants, phytoremediation plant prospects, economics, and usable plants are reviewed in this review. Several factors influence the phytoremediation process, including types of contaminants, pollutant characteristics, and plant species selection, climate considerations, flooding and aging, the effect of salt, soil parameters, and redox potential. Phytoremediation’s environmental and economic efficiency, use, and relevance are depicted in our work. Multiple recent breakthroughs in phytoremediation technologies are also mentioned in this review.

scholarly journals Keanekaragaman Jenis Ikan di Sepanjang Sungai Boyong – Code Propinsi Daerah Istimewa Yogyakarta

2016 ◽  
Vol 1 (1) ◽  
pp. 21 ◽  
Author(s):  
Tri Trijoko ◽  
Donan Satria Yudha ◽  
Rury Eprilurahman ◽  
Setiawan Silva Pambudi
Keyword(s):  
Fish Fauna ◽  
Native Fish ◽  
Fish Diversity ◽  
Sampling Area ◽  
Anabas Testudineus ◽  
Merapi Volcano ◽  
Starting Point ◽  
Introduced Fishes ◽  
Middle Stream ◽  
Channa Striata

The diversity of freshwater fishes which inhabit in the river of Daerah Istimewa Yogyakarta is not yet well documented. Complete documentation is needed as starting point and continuous research on the fish diversity in DIY. Boyong-Code River flows across the DIY, and it upstream is located on the hillside of Merapi volcano. The Code River upstream is called Boyong River. The research was aimed to acquire data about the diversity of fish fauna along the Boyong-Code River in the DIY. Further, the research purpose is to know which species are rare, potential for aquaculture, and introductive. Samples are taken along the Boyong-Code River starting from upstream to downstream. Samples were collected using Purposive Random Sampling methods with fishnets. Sampling area generally divided into three location i.e., upstream, middle-stream and downstream. Species diversity of fish in the Boyong-Code River is consisted of 24 species, with 5 introductive species. There are eleven native fish species which are potential for cultivation (aquaculture), i.e.: Barbodes binotatus, Mystacoleucus obtusirostris, Rasbora lateristriata, Rasbora argyrotaenia, Barbonymus balleroides, Osteochilus vittatus, Hampala macrolepidota, Anabas testudineus, Channa striata, Clarias leiacanthus and Clarias batrachus. The Boyong-Code River is a decent habitat for fishes. Many introduced fishes starting to invade the Boyong-Code River intentionally or unintentionally by human

scholarly journals Towards a sustainable approach to wastewater treatment strategy for eutrophication abatement

2018 ◽  
Vol 45 ◽  
pp. 00056 ◽  
Author(s):  
Elena Neverova-Dziopak
Keyword(s):  
Wastewater Treatment ◽  
Aquatic Ecosystems ◽  
Aquatic Vegetation ◽  
Negative Impact ◽  
Point Of View ◽  
Negative Effects ◽  
Nitrogen And Phosphorus ◽  
Economic Point ◽  
The Public ◽  
Treatment Technologies

Eutrophication is one of the consequences of the negative anthropogenic impact on aquatic ecosystems. It leads to the degradation of both sweet and marine ecosystems, constituting a kind of secondary pollution of waters, which disturbs all types of their use. Undertakings related to preventing the negative effects of eutrophication are mainly conducted towards reducing the loads of nutrients introduced into surface waters and controlling the entire conditions in aquatic ecosystems in order to limit the development of aquatic vegetation. The increasingly restrictive legal requirement regarding the content of nitrogen and phosphorus in wastewater discharged into recipients enforces the application of expensive treatment technologies, and the public is becoming more aware of the rising costs of water and wastewater fees. In addition, wastewater treatment is a factor which has a negative impact on air quality due to greenhouse gas emissions and generates other environmental problems. The challenge for facilities, however, is determining which treatment alternatives will best meet their needs, both technically and financially, and to choose the most sustainable path. The problem of establishing a reasonable level of nutrient removal from wastewater, justified from an ecological and economic point of view is discussed in the paper.

scholarly journals Development of a fish-based index for the assessment of the ecological status of Lake Balaton in the absence of present day reference condition

2020 ◽  
pp. 11 ◽  
Author(s):  
András Specziár ◽  
Tibor Erős
Keyword(s):  
Native Species ◽  
Ecological Status ◽  
Fish Fauna ◽  
Native Fish ◽  
Lake Balaton ◽  
Anthropogenic Pressures ◽  
Key Species ◽  
Good Ecological Status ◽  
Electric Fishing

A fish-based index is proposed to indicate the ecological status of Lake Balaton, Hungary in accordance with the standard of the European Water Framework Directive (WFD). The Balaton fish index (BFI) synthetises information of 13 lake-specific fish metrics including gillnetting and electric fishing data of species richness of native assemblages, relative abundance, biomass and age structure of native key species, representation of non-native species and general health status. The main anthropogenic pressures considered were the degradation of littoral habitats, invasion of non-native fish species, eutrophication and fishing/angling including stocking. Ecological quality ratio (EQR) is assessed by relating actual fish assemblage metrics to the supposed undisturbed reference status of Lake Balaton reconstructed by expert judgement based on recent and historic information on the fish fauna and its changes. Values of BFI were consistent and indicated good ecological status of Lake Balaton in the period of 2005–2018. This study provides an example on how an EQR assessment methodology might be established in unique habitats with no possibilities for statistical evaluation of pressure-respond relationships and exact determination of the reference status.

scholarly journals Gammarus-Microbial Interactions: A Review

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Daniel Nelson
Keyword(s):  
Leaf Litter ◽  
Aquatic Ecosystems ◽  
Poor Quality ◽  
Fungal Species ◽  
Microbial Interactions ◽  
Negative Effects ◽  
Freshwater Habitats ◽  
In The Wild ◽  
Survival And Growth ◽  
Organic Matter Fractions

Gammarusspp. are typically classified as shredders under the functional feeding group classification. In the wild and in the laboratory,Gammarusspp. will often shred leaves, breaking them down into finer organic matter fractions. However, leaf litter is a poor quality food source (i.e., high C : N and C : P ratios) and very little leaf material is assimilated by shredders. In freshwater habitats leaf litter is colonized rapidly (within ∼1-2 weeks) by aquatic fungi and bacteria, making the leaves more palatable and nutritious to consumers. Several studies have shown thatGammarusspp. show preference for conditioned leaves over nonconditioned leaves and certain fungal species to others. Furthermore,Gammarusspp. show increased survival and growth rates when fed conditioned leaves compared to non-conditioned leaves. Thus,Gammarusspp. appear to rely on the microbial biofilm associated with leaf detritus as a source of carbon and/or essential nutrients. Also,Gammarusspp. can have both positive and negative effects on the microbial communities on which they fed, making them an important component of the microbial loop in aquatic ecosystems.

scholarly journals Inventory of the fish fauna from Ivaí River basin, Paraná State, Brazil

2016 ◽  
Vol 16 (3) ◽  
Author(s):  
Augusto Frota ◽  
Gabriel de Carvalho Deprá ◽  
Letícia Machado Petenucci ◽  
Weferson Júnio da Graça
Keyword(s):  
River Basin ◽  
Native Species ◽  
Flood Control ◽  
Environmental Heterogeneity ◽  
Hydroelectric Plant ◽  
Extinction Risk ◽  
Fish Fauna ◽  
Native Fish ◽  
Species Introduction ◽  
High Species Richness

Abstract We compiled data on fish fauna of the Ivaí River basin from recent specialised literature, standardised sampling and records of species deposited in fish collections. There were 118 fish species of eight orders and 29 families. Of these, 100 species are autochthonous (84.8%), 13, allochthonous (11.0%) and five, exotic (4.2%). The main causes for the occurrence of non-native species are escapes from aquaculture, introduction for fishing purposes and the construction of the Itaipu hydroelectric plant. The predominance of small and medium-sized Characiformes and Siluriformes, including 13 species new to science, accounts for approximately 11.0% of all species and 13.0% of all native species. About 10.2% of all species and 12.0% of all native species are endemic to the upper stretch of the Ivaí River, isolated by numerous waterfalls in tributary rivers and streams. The Ivaí River basin is subjected to various anthropogenic interferences such as pollution, eutrophication, siltation, construction of dams, flood control, fisheries, species introduction and release of fingerlings. These activities raise concerns about biodiversity of Brazilian inland waters especially regarding the fish fauna; the basin of the Ivaí River already has species classified in categories of extinction risk: Brycon nattereri and Apareiodon vladii (Vulnerable) and Characidium heirmostigmata and Steindachneridion scriptum (Endangered). The high species richness of native fish, endemism of some, high environmental heterogeneity, high risk of extinction and lack of knowledge of several other species along with the eminent human activities raise the need to enrich the scientific knowledge for future conservation efforts for the studied basin.

The effects of acidification on Scandinavian freshwater fish fauna

1984 ◽  
Vol 305 (1124) ◽  
pp. 517-528 ◽  
Keyword(s):  
Freshwater Fish ◽  
Surface Area ◽  
Aquatic Ecosystems ◽  
Fish Fauna ◽  
Fish Populations ◽  
Lake Surface ◽  
Southwest Coast ◽  
Freshwater Fish Fauna ◽  
Lake Surface Area ◽  
Southern Norway

Acidification of freshwaters have inflicted a m ajor perturbation on Scandinavian aquatic ecosystems as indicated by severe regional loss of fish populations. This decline was first noted in the early 1920s but became particularly severe after W orld W ar II in the 1950s and 1960s. In southern Norway regional dam age is now docum ented in an area of 33000 km 2 , 13000 km 2 of which are devoid offish. Several m ajor southern salmon rivers are now barren. In Sweden more than 2500 lakes are docum ented to be affected. This corresponds to 3 -4 % of the total lake surface area. An additional 6000 lakes are assumed to be affected by acidification. Population losses are also found in thousands of kilometres of running w ater as well as in salmon and seatrout rivers on the southwest coast. This paper describes the early observations, chronology of this decline and reviews possible causes and mechanisms. The acidification and the associated loss of fishstocks over vast areas is apparently the most devastating change recorded for the fish fauna of Scandinavia

Environmental factors influencing the distribution and abundance of the introduced signal crayfish in the north of Iberian Peninsula

2017 ◽  
Vol 68 (5) ◽  
pp. 900 ◽  
Author(s):  
I. Vedia ◽  
D. Galicia ◽  
E. Baquero ◽  
J. Oscoz ◽  
R. Miranda
Keyword(s):  
Aquatic Ecosystems ◽  
Procambarus Clarkii ◽  
Lower Proportion ◽  
Native Fish ◽  
Limiting Factor ◽  
Northern Spain ◽  
Signal Crayfish ◽  
The North ◽  
Organic Debris ◽  
Invasive Crayfish

The identification of habitat requirements of invasive species is essential to evaluate their spread and to assess the vulnerability of recipient ecosystems. We studied the distribution and abundance of the invasive signal crayfish (Pacifastacus leniusculus) in 43 sites in northern Spain and analysed the relationships with several abiotic and biotic parameters of the aquatic ecosystems. Our results indicated that the abundance of signal crayfish was positively associated with vegetation cover and negatively associated with boulders. Also, its abundance was positively correlated with water temperature, organic matter, cations (e.g. sodium), anions (e.g. sulfates) and abundance of some native fish species (Parachondrostoma miegii and Luciobarbus graellsii). We concluded that the habitat of signal crayfish is among salmonid stretches (headwaters) with cold waters and low proportion of organic debris, and among cyprinid stretches (low waters) with warmer waters which it inhabits with another invasive crayfish, the red swamp crayfish (Procambarus clarkii). Our analysis indicated that the presence of signal crayfish is limited in the uppermost stretches by lower water temperatures and a lower proportion of organic debris. The existence of a natural environmental limiting factor in upstream reaches facilitates the conservation of aquatic ecosystems and native fauna.

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