<abstract xmlns="http://www.w3.org/1999/xhtml">

In this work, studies have been conducted to detect antibiotic resistance microorganisms and resistance genes in the natural waters of the Uzh River, which flows in the Carpathian region (Ukraine) and flows into the Laborec River in the territory of Slovakia. Among the most common microorganisms of the Uzh River, there has been a high level of resistance to tetracyclines, β-lactams, and antibiotics of the last line of defence (carbapenems, fourth-generation fluoroquinolones). The results of molecular genetic analysis indicate the presence of resistance genes <italic>bla</italic> tet-M, <italic>bla</italic> CTX-M, <italic>bla</italic> TEM, and <italic>bla</italic> KPC in microorganisms of the Enterobacteriaceae family.
</abstract>

Biological Faculty, Department of Genetics, Plant Physiology and Microbiology

Uzhhorod National University, Biological Faculty

Department of Genetics, Plant Physiology and Microbiology

Urban Aquatic Ecosystems as a Factor of the Spread of Antibiotic Resistant Microorganisms and Resistance Genes

<abstract xmlns="http://www.w3.org/1999/xhtml">

The aim of the present study was to investigate the cellular characteristics of the immune tissues of Zebrafish, <italic>Danio rerio</italic> (Hamilton, 1822). The fish were fixed in Bouin՚s solution for 24 hours then dehydrated, cleared, paraffinized, embedded and finally sectioned, stained and observed through optical microscopy. Results showed that immune system tissues of Zebrafish include the apical part of the kidney, thymus, and spleen. The apical part of the kidney was composed of hematopoietic tissue containing blood and immune cells. The spleen was a single organ located at the abdominal cavity containing melanomacrophages. The thymus was observed as a paired organ at the posterior part of the branchial cavity. Results showed that the immune system of the Zebrafish was dispersed in several organs of the body and that this species could be used as a laboratory model organism in immune system studies.
</abstract>

Histological Study of the Immune System in Zebrafish, <italic>Danio Rerio</italic> (Hamilton, 1822)

<abstract xmlns="http://www.w3.org/1999/xhtml">

Epizootic Ulcerative Syndrome (EUS) has been causing large-scale mortality among the freshwater fishes of the globe since the 1070s.
The symptoms include large haemorrhagic cutaneous ulcers, epidermal degeneration and necrosis followed by sloughing of scales. There have been many studies on EUS throughout the world. In India, since the initiation of EUS, in 1988, our study tried to reveal the aetiology of the disease through extensive and intensive studies on different aspects, like limnological, physical, chemical, bacteriological, fungal, viral including electron microscopic studies. Details of EUS investigation has been discussed in the present paper.
</abstract>

Division of Wetlands, Fisheries and Aquaculture, Department of Life Science

Epizootic Ulcerative Syndrome (EUS) Fish Disease Chronology, Status and Major Outbreaks in the World

<abstract xmlns="http://www.w3.org/1999/xhtml">

We studied the reproductive traits in 23 of 190 individuals of <italic>Capoeta umbla</italic> caught monthly in the Solhan Creek of the Murat River between April 2017 and March 2018. The sex ratio (F:M) was found to be 1:1.11. The macroscopic examination of the gonads and gonado-somatic index indicated that the reproductive period lasted from May to August with peak activity in May. The fecundity ranged from 2,000 to 9,000 oocytes, and it correlated with the total length and body weight. This work represents the first attempt to investigate the reproductive traits of the <italic>Capoeta umbla</italic> population in the Solhan Creek. The results provide information on the reproductive biology and contribute to the conservation of the fish population and its sustainable management.
</abstract>

Department of Biology, Faculty of Science and Arts

Reproductive Biology of the Tigris Scraper, <italic>Capoeta Umbla</italic> (Heckel, 1843) Population Living in Solhan Creek of Murat River (Bingöl, Turkey)

<abstract xmlns="http://www.w3.org/1999/xhtml">

The probability of occurrence, distribution, and abundance of bleak, common spirlin, and sunbleak in 316 small rivers of the Republic of Tatarstan were studied. The studied region has a high geographical and environmental heterogeneity. The impact of environmental factors on species occurrence was analyzed with generalized linear models. Among the selected fish, sunbleak had the highest probability of occurrence, and bleak had the highest abundance. Elevation was the only environmental variable significantly affecting the probability of occurrence of all three species. With an increase in elevation, the probability of occurrence of bleak, common spirlin, and sunbleak significantly decreased. Optimum values and niche breadth differed significantly between fish species for some of the environmental variables.
</abstract>

Occurrence, Abundance and Distribution of Bleak, Common Spirlin, and Sunbleak in the Environmental Gradients of Small Rivers (Tatarstan)

<abstract xmlns="http://www.w3.org/1999/xhtml">

Length-frequency distributions, length-weight relationships, length-length relationships and condition factors (Fulton’s KF, allometric KA, and relative KR) of <italic>Arius gigas</italic> in the Obuama Creek in Rivers State, Nigeria were investigated. 217 samples were collected from artisanal fishermen fishing on the Obuama Creek from March to September 2019. The parameter b of the length-weight relationship was 2.52 indicating negative allometric growth. The KF ranged from 0.51 to 2.03 with a mean value of 0.85 ± 0 while the overall low values of KR and KA, in this study are generally a characteristic of fish in poor health. This study provides basic information on some of the biological features of <italic>A. gigas</italic> which should be useful for facilitating management strategies and regulations of the stocks.
</abstract>

Some Aspects of the Growth Features and Condition Factor of <italic>Arius Gigas</italic> (Boulenger, 1911) from Obuama Creek (Rivers State, Nigeria)

<abstract xmlns="http://www.w3.org/1999/xhtml">

212 marine fishery resources were recorded in the waters of Andhra Pradesh State. Morphometric data was provided for 20 edible fishery resources landing at the fishing harbour of Visakhapatnam. The harbour area is polluted due to influx of various industrial effluents and domestic sewage. In <italic>Pampus argenteus, P. chinensis</italic> and <italic>Parastromateus niger</italic>, the total protein content is 16.24-19.58%. Further, arsenic concentration in muscle and gill portions individually or combined in all three of the species is highly negligible. Cadmium, mercury, and lead levels in the muscle and gills of these species are within or slightly above the recommended limits set by EU (2006) and FAO (2003), FAO/WHO (2011), MAFF, and FSSAI (2011) indicating that the consumption of these fishes is not harmful.
</abstract>

A Study on Marine Fishery Resources of Andhra Pradesh: Ecological Aspects and Morphometrics of Common Marine Fishes of Visakhapatnam ‒ Protein Content and Bioaccumulation of Heavy Metals in Pomfret Fish Species

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Transylvanian Review of Systematical and Ecological Research

 Publishing House and Owner: Lucian Blaga University of Sibiu, Romania  Founded 1999, is an international scientific publication, edited in Sibiu, Romania. It publishes original work dealing with basic aspects, particularly of ecology, systematics and related fields.  Transylvanian Review of Systematical and Ecological Research deal with the worldwide publishing of original articles and reviews related to the theoretical, experimental, and applied aspects, particularly of ecology, biology, systematics, environmental sciences and related fields. We publish high quality papers concerned to habitats, species, associations, communities, ecosystems in their natural state or under anthropogenic threats, risks, and impacts. The published information, data, discussions, and conclusions must exceed the edges of case studies, highlight significant results using any ecological approach, and for that reason only publish papers with robust ecological messages that improve our knowledge of ecological principles, reality, and trends.  Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 

Transylvanian Review of Systematical and Ecological Research

Volume 23 (2021): Issue 2 (July 2021)

Urban Aquatic Ecosystems as a Factor of the Spread of Antibiotic Resistant Microorganisms and Resistance Genes

Histological Study of the Immune System in Zebrafish, Danio Rerio (Hamilton, 1822)

Epizootic Ulcerative Syndrome (EUS) Fish Disease Chronology, Status and Major Outbreaks in the World

Reproductive Biology of the Tigris Scraper, Capoeta Umbla (Heckel, 1843) Population Living in Solhan Creek of Murat River (Bingöl, Turkey)

Occurrence, Abundance and Distribution of Bleak, Common Spirlin, and Sunbleak in the Environmental Gradients of Small Rivers (Tatarstan)

Some Aspects of the Growth Features and Condition Factor of Arius Gigas (Boulenger, 1911) from Obuama Creek (Rivers State, Nigeria)

A Study on Marine Fishery Resources of Andhra Pradesh: Ecological Aspects and Morphometrics of Common Marine Fishes of Visakhapatnam ‒ Protein Content and Bioaccumulation of Heavy Metals in Pomfret Fish Species

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