Fazıl Şen - Academia.edu (original) (raw)

Papers by Fazıl Şen

Journal of Chemistry, 2015

Water quality parameters were analyzed in Bulakbaşı stream. The in situ measurements and laborato... more Water quality parameters were analyzed in Bulakbaşı stream. The in situ measurements and laboratory analyses were made on water samples taken from 4 sampling points on the Bulakbaşı stream monthly. During the study, the average water temperature as 16.3°C, dissolved oxygen (DO) 12.91 mg/L, oxygen saturation (OS) 152.8%, pH 8.25, electrical conductivity (EC) 779.6 μS/cm, salinity 0.435‰, chloride 83.97 mg/L, calcium 56.5 mg/L, magnesium 57.1 mg/L, total hardness 391.1 mg/L CaCO3, carbonate 0 mg/L, bicarbonate 365.95 mg/L, total alkalinity 299.85 mg/L, nitrate 4.74 mg/L, nitrite 20.83 µg/L, ammonium 50.8 µg/L, ammonia 48.3 µg/L, phosphorus 77.5 µg/L, sulfate 57.6 mg/L, potassium 4.52 mg/L, copper and aluminum 0.0 µg/L, total iron 10.1 µg/L, zinc 168.2 µg/L, chromium 24 µg/L, manganese 401.7 µg/L, and cyanide 6.79 µg/L were found. According to EU, WHO, and Turkish standards, Bulakbaşı stream is not polluted and it has suitable quality with respect to drinking, aquaculture, and irrigation.

Journal of ichthyology, Feb 11, 2024

Brazilian Journal of Biology, 2023

Since water is one of the essentials for life, the presence and quality of water in the habitat i... more Since water is one of the essentials for life, the presence and quality of water in the habitat is extremely important. Therefore, water quality change and management of Lake Aygır was investigated in this study. For this, water samples collected from the lake and the irrigation pool between May 2015 and May 2016 were analyzed monthly. Spectrophotometric, titrimetric and microbiological methods were used to determine the water quality. According to some water quality regulations, HCO 3 , NH 4 , Cu, Mo, Br, fecal coliform and total suspended solid (TSS) values were found above the limit values. The other 29 parameters comply with Turkish national and international legislations. Lake Aygır was negatively affected by the surrounding settlements and agricultural activities. It is thought that the water resource should be monitored periodically and remedial studies should be done to prevent parameters exceeding the limits. However, Lake Aygır was generally suitable for drinking, use, fishing and irrigation.

Marine Pollution Bulletin

Yüzüncü Yıl Üniversitesi Tarım Bilimleri Dergisi, 2018

Yüzüncü Yil Üniversitesi Journal of Agricultural Sciences, 2016

Bu çalışma 2008-2012 yılları arasında Van Gölü Havzasında yayılış gösteren balık türlerini ve yay... more Bu çalışma 2008-2012 yılları arasında Van Gölü Havzasında yayılış gösteren balık türlerini ve yayılış bölgelerini belirlemek amacıyla yapılmıştır. Van Gölü Havzası kapalı bir havza olup Türkiye yüzey alanının yaklaşık % 2.3'lük bir kısmını oluşturmaktadır. Kapalı bir havza olmasından dolayı tür çeşitliliği farklılıklar göstermektedir. Havza endemik tür çeşitliliği açısından hem bitki, hem de hayvan türleri olarak oldukça zengindir. Bu zenginlik balık türlerine de yansımıştır. Havzada doğal yayılış gösteren balık türlerinin tamamı endemik türlerden oluşmaktadır. Havzada Alburnus tarichi, Alburnus timarensis, Barbus ercisianus, Capoeta cosswigi ve Oxynoemacheilus ercisianus türleri doğal yayılış göstermektedir. Cyprinus carpio, Carassius gibelio, Gambusia holbrooki ve Aphanius mento türlerinin ise aşılandıkları çeşitli kaynaklarda populasyon oluşturdukları tespit edilmiştir. Ayrıca havzada çeşitli kaynaklara aşılanan veya balık üretim çiftliklerinden kaçan Oncorhynchus mykiss örnekleri elde dilmiş olsa da populasyon oluşturamadığı görülmüştür. Barbus ercisianus x Capoeta cosswigi türlerinin Zilan ve Deliçayda, Cyprinus carpio x Carassius carassius türlerinin ise Nazik gölünde melez bireyler oluşturdukları görülmüştür.This study was carried out to determine the fish species of Van Lake Basin between in 20082012. Van Lake Basin is a closed basin that shaped approximately 2.3 % of Turkey. Because of closed basin character, the differences indicated in species diversity. Basin is rich in endemic species diversity with plant and animal species. This richness were reflected to fish species. All of the fish species naturally occurring in the lake basin are consist of endemic species. Alburnus tarichi, Alburnus timarensis, Barbus ercisianus, Capoeta cosswigi and Oxynoemacheilus ercisianus exhibited a natural distribution. Cyprinus carpio, Carassius gibelio, Gambusia holbrooki and Aphanius mento were constituted population from various water sources. In addition, escaped from fish farm sorvaccinated to water resources Oncorhynchus mykiss was unable to create the population. Barbus ercisianus and Capoeta cosswigi shown to create hybrid fish species in Zilan and Deliçay. Cyprinus carpio and Carassius carassius shown to create hybrid fish species in Nazik Lake

Yüzüncü yıl üniversitesi fen bilimleri enstitüsü dergisi, 2005

Van Sağlık Bilimleri Dergisi, Nov 6, 1995

Brazilian Journal of Biology, 2021

This study aimed to determine the distribution area of tarek (Alburnus tarichi (Güldenstädt, 1814... more This study aimed to determine the distribution area of tarek (Alburnus tarichi (Güldenstädt, 1814)) and to define how it must be called according to the scientific name by evaluating its previous studies made by various systematisers and their reports on its distribution, and by comparing literature knowledge. The taxonomic characteristics of the collected samples were evaluated and several measurements and counts were taken on the samples; analfin origin 0-4 scales behind dorsal fin-base; 72-91 lateral line scales; 21-29 gill rakers; 7½-10 branched dorsal-fin rays and 10-12½ branched anal-fin rays. Body and caudal peduncle was moderately compressed. Body was covered by overlapping scales. Tarek has five different populations in the Basin. They are Van, Erçek, Nazik and Aygır Lakes and Koçköprü Dam Lake populations. The main living area of the tarek population is Lake Van; however, between May and June, mature individuals of tarek enter to tributaries of Van Lake. Some of them are K...

Aquaculture International

Aquatic Sciences and Engineering

The Karasu River (Van, Turkey) is one of the most important sources of intensive reproduction for... more The Karasu River (Van, Turkey) is one of the most important sources of intensive reproduction for Tarek (Alburnus tarichi Güldenstädt, 1814) in the Van Lake basin. However, sand pits and sand extraction activities in the Karasu River threaten the spawning areas of A. tarichi. This study aimed to investigate how increased sediment concentration in the Karasu River affects the eggs and larvae of A. tarichi during the reproductive period. The study in the laboratory was designed by measuring total suspended solids and turbidity associated with the river over two years for five different experimental groups (corresponding to 0, 10, 50, 100, and 600 mg L-1 , and associated groups: control group, Group 1, Group 2, Group 3, and Group 4, respectively). The percentage of hatched out larvae was statistically different between the groups (p<0.05). The highest percentages of hatched out larvae were found in the control group (73.98±5.89%) and Group 1 (68.05±2.96%). The highest survival rates in larvae were determined in the control group (53.35±5.62%) and Group 1 (44.98±4.41%). These results demonstrate that A. tarichi is sensitive to suspended solid concentrations that are very common in the natural environment. In conclusion, sand pits and sand extraction activities must be stopped completely during the reproductive period of A. tarichi between May and July and strict controls should be put in place during this time. These measures will provide an important contribution to ensuring the continuity of this species.

Yüzüncü Yıl Üniversitesi Tarım Bilimleri Dergisi

Van Basin has a rich geographical structure in terms of water resources and endemic fish species.... more Van Basin has a rich geographical structure in terms of water resources and endemic fish species. In this study, Ligula intestinalis parasite, which is the host of Barbus ercisianus living in Nemrut Crater Lake, was recorded for the first time. The parasite was described molecularly as well as morphologically. In this context, a primer set was designed for molecular identification for the 28S rRNA gene region of L. intestinalis. Real-Time PCR results with the designed primers gave positive results in all parasite samples. The results were confirmed by a single peak (87) in the HRM analysis.

Ege Üniversitesi Ziraat Fakültesi Dergisi

Van Gölü Havzası kapalı bir havza konumunda olup, içerisinde birçok tuzlu su kaynağı bulunmaktadı... more Van Gölü Havzası kapalı bir havza konumunda olup, içerisinde birçok tuzlu su kaynağı bulunmaktadır. Bu çalışmada Van Gölü Havzası içerisinde yer alan Van Gölü dışındaki diğer tuzlu su kaynaklarının özellikleri araştırılmıştır. Çalışmada tuzlu su kaynaklarına ait sıcaklık, çözünmüş oksijen, tuzluluk, elektriksel iletkenlik ve pH ortalama değerleri sırasıyla 23.5±1.8 (13.8-27.4)°C, 11.36±1.56 (6.91-17.70) mg/L, ‰3.67±1.47 (0.71-12.16), 6452.4±2350.0 (1087.0-19730.0) μS/cm ve 9.02±0.50 (6.21-10.13) olarak ölçülmüştür. Örnek sularında ağır metallerden bakır, kadminyum, kurşun ve selenyum belirlenmezken, diğer ağır metal ortalama seviyeleri Mo> Mn > Al > Zn > Fe > Cr > Co > Ni > As şeklinde olmuştur. Ağır metal sonuçları üzerinden belirlenen ağır metal kirlilik indeks ortalama değeri 147.4±25.2 hesaplanırken, Van Gölü Havzası tuzlu suları HPI kalite sınıfına göre genel olarak “kullanılamaz su” sınıfında yer almıştır. Örnekleme noktaları arasında HPI kalite sınıfla...

DergiPark (Istanbul University), Jun 7, 2016

Marine Science and Technology Bulletin

Water quality indices help to develop correct policies using water quality data. In this study, a... more Water quality indices help to develop correct policies using water quality data. In this study, a useful and reliable method was determined for water quality management of Lake Aygır. For this, monthly water quality measurements were made from Lake Aygır between May 2015 and May 2016. Expert opinions and literature were used in the selection of parameters. Temperature, dissolved oxygen, electrical conductivity, pH, ammonia, alkalinity, hardness, fluorine, and arsenic parameters were selected for the calculation of the water quality index of Lake Aygır for drinking (AG-WQIdrinking), as it is more effective on human health. Temperature, dissolved oxygen, electrical conductivity, pH, ammonia, alkalinity, hardness, and turbidity were selected for the calculation of the water quality index of Lake Aygır for fisheries (AG-WQIfisheries) as they are the parameters to which fish is most affected. Water quality indices of Lake Aygır were found AG-WQIdrinking as 149.41 and AG-WQIfisheries as 7...

Chemistry and Ecology, 2022

ABSTRACT Increasing pollution of plastics smaller than 5 mm (microplastics [MPs]) in seas and oce... more ABSTRACT Increasing pollution of plastics smaller than 5 mm (microplastics [MPs]) in seas and oceans as well as in inland waters around the world has recently been a significant threat to water resources. In this study, MP pollution levels were investigated using a 335 µm mesh manta trawl in November 2019 in Van Bay. Water samples were collected from 15 stations. MP particles ranged from 641424 to 1426638 per km2 in surface waters (ranged from 2.35 to 5.09 MPs/m3 in water columns). The most frequently observed MP type, size, shape and colour classes were fiber (40.5%), <0.1 mm (52.3%), irregular (40.8%) and blue (57.1%), respectively. The highest MP abundance was observed at 14 and 15 stations where lake current were effective. Station 6 were also under serious plastic pollution pressure beacuse it was located close to Akkopru and Kurubas Rivers that pass through the densely populated city center. The chemical structure of all examined MPs showed presence of polyethylene (60.2%), followed by polypropylene (20.4%), polyethylene terephthalate (17.2%) and poly(methyl acrylate) (2.2%). The MPs were also examined using scanning electron microscopy to understand the surface characteristics. In conclusion, our study revealed that the surface waters of Van Bay are highly contaminated with MPs.

Journal of Animal and Veterinary Advances, 2009