Browsing by Author "Sen, Fazil"

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Alburnus Selcuklui, a New Species of Cyprinid Fish From East Anatolia, Turkey (Teleostei: Cyprinidae)
(Central Fisheries Research inst, 2015) Elp, Mahmut; Sen, Fazil; Ozulug, Mufit
Alburnus selcuklui, a new species from a branch of Botan stream of the River Tigris in East Anatolia Turkey, is distinguished from other Anatolian Alburnus species by the anal-fin origin 0-4 scales behind the base of the dorsal fin-base, 70-80 + 3-4 lateral line scales, 10-15 gill rakers, 81/2-9 branched dorsal-fin rays, 11-121/2 branched anal-fin rays, snout rounded, prominent epidermal lateral stripe and lateral body without black pigmentation along and below lateral line.
Biological Properties of Capoeta Capoeta (Guldenstaedt, 1773) Population Living in Karasu Stream (Van, Turkey)
(Medwell online, 2009) Elp, Mahmut; Sen, Fazil
This study was carried out between March 2007 and April 2008 in Karasu Stream. Total 472 individual sampled by hand nets and electroshock. Length, weight, sex and gonad weight were determined. Age was determined by scales. The age, length and weights of samples varied from I-VI, 4.0-37.5 cm and 0.7-676.2 g, respectively. It was determined that the most samples were in 12.0-13.9 cm (16.1%) and 0-24.9 g (21.2%) group. Condition factor, length-weight, age-length, age-weight equations, mate:female ration were calculated as 1.452, W = 0.0129xL(3.039), Lt = 52.58x[1-e(-0.145x(1+0.464))], Wt = 2188.21x[1-e(-0.145x(1+0.464))](3.039), 2.603, 1:0.85, respectively. Sexual maturity size was determined as in males I I cm, in females 23 cm. In the reproduction, period reproduction nods were seen on head and anal fins of males. Relative fecundity number calculated as 44494 number kg(-1) fish and age diameter measured as 2.011 mm.
Biological Properties of Chub (Leuciscus Cephalus L., 1758) in Karasu Stream (mus/Turkey)
(Medwell online, 2008) Sen, Fazil; Saygin, Ferzende
In this study, the age, growth and reproduction of chub (L. cephalus) population, living in Karasu Stream, was determined. Total 404 chub have sampled and investigated between April 2005 and October 2006. The ages, lengths and weights of individuals varied from 1-7 year, 7.3-40.5 cm and 4.8-1002.5 g, respectively. Length-weight relationship and Von Bertalanffy Growth Equations were calculated as W = 0.00844xL(3.1558); as L-t = 60.75x(1-e(-0.088(t+0.333))) and as W-t = 3588.04x(1-e(-0.088(t+0.333)))(3.1558), respectively. The mean condition factor was defined as 1.297 +/- 0.010. It was established that females and males attained sexual maturity when they reached to 13 and 14 cm in length and third age, respectively and spawning was observed between May and July. The male:female ratio was calculated as 1.45:1. In the Population, minimum catching size should be applied as IV age, 18 cm fork length and 70 g total weight.
Chemical and Physical Quality Criteria of Bulakbasi Stream in Turkey and Usage of Drinking, Fisheries, and Irrigation
(Hindawi Ltd, 2015) Sen, Fazil; Aksoy, Abdullah
Water quality parameters were analyzed in Bulakbasi stream. The in situ measurements and laboratory analyses were made on water samples taken from 4 sampling points on the Bulakbasi stream monthly. During the study, the average water temperature as 16.3 degrees C, dissolved oxygen (DO) 12.91 mg/L, oxygen saturation (OS) 152.8%, pH 8.25, electrical conductivity (EC) 779.6 mu S/cm, salinity 0.435 parts per thousand, 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 mu g/L, ammonium 50.8 mu g/L, ammonia 48.3 mu g/L, phosphorus 77.5 mu g/L, sulfate 57.6 mg/L, potassium 4.52 mg/L, copper and aluminum 0.0 mu g/L, total iron 10.1 mu g/L, zinc 168.2 mu g/L, chromium 24 mu g/L, manganese 401.7 mu g/L, and cyanide 6.79 mu g/L were found. According to EU, WHO, and Turkish standards, Bulakbasi stream is not polluted and it has suitable quality with respect to drinking, aquaculture, and irrigation.
Effects of Salinity on Gill Histology in Sailfin Velifera (Poecilia Velifera)
(Springer, 2024) Oguz, Ahmet R.; Sepil, Ahmet; Alkan, Zehra; Azizoglu, Burcu Ergoz; Sen, Fazil; Oguz, Elif Kaval
Fish live in aquatic areas with varying salinity from fresh water to seawater. Gills are one of the most important osmoregulatory organs for maintaining the salt-water balance. In this study, changes in the gills of velifera (Poecilia sphenops) acclimated to 20, 30, 40, and 50 ppt of saline in the laboratory were examined histologically and immunohistochemically. Mucus cells (MCs), proliferating cell nuclear antigen (PCNA), mitochondria-rich cells (MRCs), and heat shock proteins (HSP70) + cells were marked in the gill tissue, which underwent routine histological procedures, and the severity of histological alterations increase with the increase of the salinity. When the gills were examined histologically, it was determined that there was an increase in cells due to hyperplasia, especially in the primary lamellae. A rapid increase in MC and HSP70 + cell numbers was observed in the 20 and 30 ppt groups. Although PCNA + cells were present in each salinity group, they were observed in the salinity group up to 50 ppt. An increase in the number and volume of MRCs was observed with increasing salinity. Based on the histological and immunohistochemical results, it is thought that the cytological and molecular arrangements of cells in gills of sailfin velifera under different levels of salinity are essential for the regulation of ion and salt balance.
The Effects of Sand Pits and Sand Extractions Region on Karasu Stream (Van) To Water Quality Criteria
(Parlar Scientific Publications (p S P), 2018) Atici, Ataman Altug; Elp, Mahmut; Sen, Fazil
In this study, physical, chemical and microbiological parameters were analyzed in water samples in order to determine the effects of sand pits and sand extraction in Karasu Stream. The water quality data were collected monthly between June 2014 and May 2016 from five sampling stations distributed along the stream and 39 parameters were examined such as dissolved oxygen, dissolved oxygen saturation, temperature, pH, electrical conductivity, flow, total suspended solids, turbidity, chlorine, calcium, magnesium, total hardness, carbonate, bicarbonate,total alkalinity, nitrate,nitrite, ammonium, ammonia, orthophosphate, total phosphor, sulfate, cyanide, silicon, silicon dioxide, biological oxygen demand, chemical oxygen demand, fluoride, fecal coliform, copper, aluminum, zinc, chromium, manganese,iron, molybdenum, cobalt, nickeland sediment accumulation. Turkish, EU and WHO water quality standarts were used in the evaluation of the results. Sand pits, sand extractions and the pollution caused by the settlement around the stream ruined the water quality of the stream and threatened the lives of the fish living in Karasu.
Effects of Total Suspended Solids at Different Levels on the Eggs and Larvae of Endemic Fish, Tarek (Alburnus Tarichi Guldenstadt, 1814) in the Karasu River (Van, Turkey)
(Istanbul Univ Press, Fac Aquatic Sciences, 2023) Atici, Ataman Altug; Elp, Mahmut; Sen, Fazil
The Karasu River (Van, Turkey) is one of the most important sources of intensive reproduction for Tarek (Alburnus tarichi Guldenstadt, 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 & PLUSMN;5.89%) and Group 1 (68.05 & PLUSMN;2.96%). The highest survival rates in larvae were determined in the control group (53.35 & PLUSMN;5.62%) and Group 1 (44.98 & PLUSMN;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.
First Evaluation of Microplastic Pollution in the Surface Waters of the Van Bay From Van Lake, Turkey
(Taylor & Francis Ltd, 2022) Atici, Ataman Altug; Sepil, Ahmet; Sen, Fazil; Karagoz, Mustafa Hamdi
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 mu m mesh manta trawl in November 2019 in Van Bay. Water samples were collected from 15 stations. MP particles ranged from 641424 to 1426638 per km(2) in surface waters (ranged from 2.35 to 5.09 MPs/m(3) 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.
Growth and Reproduction Properties of Capoeta Capoeta (Guldenstaedt, 1772) in Zernek Dam Lake, Van, Turkey
(Medwell online, 2008) Sen, Fazil; Elp, Mahmut; Kankaya, Ertugrul
This study was carried out in Zernek Dam Lake, Van, Turkey. In this study, 586 individuals have sampled and investigated between June 2006 and October 2007. The ages, lengths and weights of individuals varied from 1-7 years, 4.0-41.0 cm and 0.7-1060.4 g, respectively. Age-length and length-weight relationships were calculated as L(t) = 48.927x(1-e(-0.2038x(t+0.2028))), as W = 0.0137xL(2.992) respectively. The mean condition factor was defined as 1.339 +/- 0.005. The male: female ratio was estimated as 1:1.72. It was established that females and males attained sexual maturity when they reached to 23 and 15 cm in length, 180 and 60 g and 4th and 2nd age, respectively, spawning was observed between beginning of June and 2nd week of July. It may be suggested that fishing should be forbidden between 1 May and 1 August and minimum catching size must be 5th age, 26 cm fork length and 220 g total weight.
Growth and Reproduction Properties of Chub in Savur Stream in Turkey
(indian veterinary Journal, 2007) Sen, Fazil; Altun, Muharrem; Elp, Mahmut; Kankaya, Ertugrul
Chub (Leuciscus cephalus), a freshwater fish, is a member of the Cyprinidae family and widely distributed throughout European waters, the Black Sea Basin and Anatolian waters. The main aim of the present investigation was to study growth and reproduction characteristics of the chub (Leucicus cephalus orientalis) in Savur stream.
Growth and Reproduction Properties of Endemic Capoeta Kosswigi and Barbus Ercisianus in the Delicay Stream (Van, Turkey)
(Ege Univ, Fac Fisheries, 2021) Atici, Ataman Altug; Sepil, Ahmet; Sen, Fazil; Cavus, Asude
In this study, the growth and reproductive characteristics of Capoeta kosswigi Karaman, 1969 and Barbus ercisianus Karaman, 1971, which are endemic to the Lake Van Basin, in Delicay (Van) were investigated. A total of 309 C. kosswigi and 288 B. ercisianus specimens were caught by electrofishing between April and August 2018. The fork length of C. kosswigi and B. ercisianus ranged from 3.7-26.1 cm and from 4.3-22.7 cm, and the total weights ranged from 0.6-227.4 g and from 1.2-140.0 g, respectively. The most intensive catching was in C. kosswigi population of 5.0-6.9 (27.5%) cm and 0-19.9 (67.0%) g in the groups, and 12.0-13.9 (24.7%) cm and 0-9.9 (23.3%) g groups in B. ercisianus. Condition factor was determined as 1.305 +/- 0.008 (0.798-1.886) in C. kosswigi and 1.158 +/- 0.006 (0.864-1.559) in B. ercisianus. The length-weight relationships were calculated as W = 0.01435 x L-2.952 (r(2) = 0.996) for C. kosswigi and W = 0.01276 x L-2.959 (r(2) = 0.994) for B. ercisianus. The M:F ratio was calculated as 1:0.15 in C. kosswigi and 1:0.64 in B. ercisianus. It was established that C. kosswigi attained sexual maturity when they reached to 11 cm fork length for males, 18 cm fork length for females. Maturation of B.ercisianus individuals occurred at 9 cm fork length in males and 12 cm fork length in females. The spawning in C. kosswigi was observed from 1st week of May to 2nd week of July, and in B. ercisianus from 1st week of May to 1st week of August. It may be suggested that minimum catching size must be 20 cm fork length for C. kosswigi and 15 cm fork length for B. ercisianus.
High Levels of Microplastic Ingestion by Commercial, Planktivorous Alburnus Tarichi in Lake Van, Turkey
(Taylor & Francis Ltd, 2021) Atici, Ataman Altug; Sepil, Ahmet; Sen, Fazil
Microplastic pollution of inland environments has been receiving increased publicity over the last few years. For the first time, this study reports on the presence of microplastics (0.1 mm to <5 mm) in the gastrointestinal tracts of Alburnus tarichi in Lake Van from January to April 2020. In total, 101 fishes were obtained from Citoren, Edremit, Gevas and Dagonu fisheries regions. A total of 3338 pieces of plastic, ranging from 8 to 124 samples per fish with averaging 34 +/- 13 MPs/individual, were extracted from gastrointestinal tracts of fish. The majority of the ingested particles consisted of fibres (74%), and blue coloured material was the most consumed microplastic. The polymers identified by Fourier Transform Infrared Spectroscopy (FTIR) were polyethylene and polypropylene. Consequently, this study suggested that the vast majority of A. tarichi were contaminated with microplastics and showed higher abundance in comparison with other worldwide studies so far.
The Problems Encountered by Fish Populations Living in Lake Van Basin and Their Possible Solutions
(Ege Univ, 2006) Elp, Mahmut; Sen, Fazil; Cetinkaya, Osman
This study was carried out to determine the problems effecting the fish populations in Lake Van Basin and to discuss some solutions for mitigation. Sand pits on the stream beds were determined as the biggest problem because they destroyed the bed structure and made the water turbid. The works of these sand pits had negative effects during the spawning migration of fish such as Chlacalburnus tarichi, Capoeta capoeta and Barbus plebejus ercisianus. In this period, the turbidity and the destruction of stream bed not only can affect negatively the brood stock but also caused mass destruction of eggs and larvae. During the spawning period in Lake Nazik, especially while Cyprinus carpio returned to spawning, it was observed that some suitable costal regions for spawning were encircled by trammel nets. Precipitation regime of Van Lake Basin was very variable. In some seasons (summer) aridness were observed whereas in some seasons (spring and autumn) floods were observed. Floods can very destructive to stream beds and banks; sometimes a large amount of original material can be carried away by erosion on stream bed and banks because of destruction of vegetation and misuse of the bed by sand pit works. Dam and regulators on the stream had been built without considering fish migration and there were no fish passes. It was determined that the biggest threatening problem on fish population were sand pits working on these streams that is prohibited by Fisheries act Nr. 1380. The sand pits works should be stopped or at least regulated. Regulator and the other constructions on the streams must be arranged to fish passes. This is essential for fish populations and sustainable fisheries.
Some Biological Properties of Carp (Cyprinus Carpio L., 1758) Living in Kockopru Dam Lake, Van-Turkey
(Medwell online, 2008) Elp, Mahmut; Sen, Fazil; Cetinkaya, Osman
This study was carried out to determine some biological parameters of carp populations introduced to the Kockopru Dam Lake on the Zilan River in Lake Van Basin and conducted between December 1999 and August 2001. Sampling was carried out monthly using hand nets and trammel nets. It was determined that carp become a sustainable population and is caught by fishermen. The maximum age was determined as VII; fork length as 61.7 cm and weight as 6002.6 g. Length-weight relationship was estimated as log W = -1.402+2.847 log L and age-length relationship was determined as Lt = 84.070 (1-e(-0.126(1+0.801))). It was also determined that male female ratio was 1:0.94 and maturity size was determined as more than 45 cm for female. Reproduction period was observed in June. It was also observed that commercial fishing could be a big threat for the future of the Kockopru Dam Lake population because of undersized catch.
A Study on Water Quality of Karasu Stream (Van, Turkey) and Assessment of Usage in Drinking, Irrigation and Fisheries
(Parlar Scientific Publications (p S P), 2019) Sen, Fazil; Sekerci, Ibrahim
In this study, some water quality parameters were analyzed to investigate water quality changes in Karasu Stream which inflows to Lake Van. The in situ measurements and laboratory analyses were made on water samples taken from 4 sampling points on the Karasu Stream Bed monthly, between November 2009 and October 2010. In the study, water temperature, dissolved oxygen, dissolved oxygen saturation; conductivity, pH, calcium, magnesium, total hardness, total alkalinity, carbonate and bicarbonate, chloride, salinity, nitrate, nitrite, ammonium, ammonia, phosphorus and sulfate were analyzed. They were determined that average water temperature was 13.4 degrees C, dissolved oxygen between 10.03 mg/L, saturation 119.4%, pH 8.23, conductivity 601.4 S/cm, salinity 0.08 parts per thousand, chloride 47.66 mg/L, calcium 31.0 mg/L, magnesium 111.2 mg/L, total hardness 536 mg/L, bicarbonate 452.2 mg/L, total alkalinity 370.3 mg/L, nitrate 4.1 mg/L, nitrite 0.017 mg/L, ammonium 0.41 mg/L, ammonia 0.40 mg/L, total phosphorus 0.06 mg/L and sulfate 19.5 mg/L. At the all sampling points and all months, carbonate was not encountered. Karasu Stream is in first and second water quality classes all of water quality criteria.
Validation of Alburnus Timarensis From the Lake Van Basin, Eastern Anatolia (Teleostei: Cyprinidae)
(Taylor & Francis Ltd, 2013) Elp, Mahmut; Ozulug, Mufit; Sen, Fazil; Freyhof, Jorg
The Lake Van basin located in eastern Anatolia is inhabited by two species of Alburnus: Alburnus tarichi is a migratory species foraging in the lake and spawning in all tributaries, while A. timarensis is resident in streams and is known only from one tributary of the lake, the Karasu. It could be shown that A. timarensis is a valid species, which is rediagnosed here. Both species are syntopic during the spawning season, but are well distinguished by size, gill raker and lateral line scale counts.