Sürdürülebilir Kalkınma Amaçları
Yayınlar
- MakaleAçık Erişim2026Scopus SJRQ2Relative Efficiencies of Live, Dry and Mixed Food Diets for Larval Rearing of Tigris Scraper (Capoeta umbla) and the Influence of Stocking Density on Fry Growth Characteristics
Gün, Abdulselam; Kızak, Volkan; Gündüz, Fatih
In this research, larval growth features by applying different diets and growth characteristics of fry at different stocking densities were studied under controlled conditions for the Tigris scraper (Capoeta umbla). In the first experiment, the growth and survival rates of Tigris scraper postlarvae were evaluated under three different diet regimes over 21 days. The highest mean total length was 24.04±0.27 mm in the group L1 fed solely Artemia nauplii, and the lowest mean total length was 17.89±0.16 mm in the group L2 fed only dry feed. The highest mean specific growth rate was in the L1, and the lowest mean specific growth rate was in the L2. In the second experiment in which the growth characteristics of fry were investigated at different stocking densities for 98 days, the highest mean live weight was found in S1 with 2.819±0.157 g and the lowest mean live weight was determined as 0.859±0.073 g in S5. The highest mean specific growth rate was in S1, while the lowest rate was in S5. High stocking densities were found to be disadvantageous for growth of C. umbla fry. The findings suggest that successful rearing of Tigris scraper postlarvae and fry is feasible under controlled conditions.
- MakaleAçık Erişim2025Scopus SJRQ1Site Fidelity, Home Range Size and Movement Patterns of a Mega-Fish, Luciobarbus esocinus, in Keban Reservoir, Euphrates River
Alp, Ahmet; Akyüz, Adil; Gündüz, Fatih; Demirol, Ferhat; Çoban, Mehmet Zülfü; Yüksel, Fahrettin; Yerli, Sedat Vahdet
Luciobarbus esocinus (mangar), a critically endangered mega-fish species (≤ 140 kg) endemic to the Euphrates and Tigris river systems, faces severe threats due to habitat fragmentation. To assess its spatial ecology in the Keban Reservoir, 30 individuals were acoustically tagged and monitored for 218–437 days using 18 receivers deployed in the reservoir. The tagged fish exhibited low site fidelity, with station residency indices (RI) ranging from 0.00 to 0.46 and detection periods lasting 59–153 days. Depth and temperature data (115,318 and 112,789 records, respectively) revealed seasonal habitat shifts: individuals occupied deeper waters in winter (mean 10.1 m), shallower depths in spring (4.4 m) and summer (3.8 m), and tolerated temperatures of 7.4°C–28.4°C. Although depth use was weakly correlated with temperature, trends indicated shallower occupancy during warmer periods. Home range analyses showed a maximum linear home range (LHR) of 36.5 km and the areal home range estimated via minimum convex polygon (MCP) was 6422.8 ha. In addition, kernel density (KD) analysis revealed the 95% KD area was 2877.0 ha, the 75% KD area was 67.7 ha and the 50% KD area was 33.8 ha. Seasonal migrations spanned 25–30 km upstream/downstream from release sites, particularly toward tributaries in spring. Around the Keban Reservoir, 14 hydroelectric power plants (HPPs) present and most of these HPP are not designed suitable fish passages. Urgent conservation measures are needed, including Fish Conservation Zones in critical habitats and connectivity restoration via functional fishways, to safeguard this imperilled species in fragmented river-reservoir ecosystems.
- MakaleAçık Erişim2022Tunceli Uzunçayır Baraj Gölü’ndeki Kababurun (Chondrostoma regium, (Heckel, 1843)) Balıklarının Et Veriminin Belirlenmesi
Yüksel, Fahrettın; Demirol, Ferhat; Kurt Kaya, Gülderen; Gündüz, Fatih
Bu çalışma, Uzunçayır Baraj Gölü’nden avlanan kababurun balığı (Chondrostoma regium, (Heckel, 1843))’nın et verimliliğini belirlemek amacıyla yürütülmüştür. Bu amaçla çalışmada, C. regium türüne ait yaşları I-VIII arasında dağılım gösteren 100 adet balık kullanılmış olup, et verimliliği ile farklı vücut kısımları arasındaki ilişkiler incelenmiştir. İncelenen örneklerde, ortalama yüzgeç ağırlığı, omurga ağırlığı, deri ağırlığı, baş ağırlığı, iç organ ağırlığı ve tüketilebilir kısımların vücut ağırlığına göre yüzde oranları sırasıyla %1,72, %3,57, %7,50, %10,55, %9,94 ve %66,72 olarak belirlenmiştir. Çalışmanın sonunda kababurun örneklerinde en yüksek tüketilebilir et oranının III. yaş grubunda (%67,91), en düşük et oranının ise I. yaş (%62,04) grubunda olduğu belirlenmiştir.
- MakaleYalnız künye2018Uzunçayır Baraj Gölü’ndeki Capoeta trutta (Heckel, 1843)’nın Üreme Biyolojisi
Yüksel, Fahrettın; Çoban, M. Zülfü; Alpaslan, Kenan; Demirol, Ferhat; Gündüz, Fatih; Alp, Ahmet
Çalışmada, sürdürülebilir avcılık stratejilerinin belirlenebilmesi amacıyla, Uzunçayır Baraj Gölü'ndeki Capoeta trutta'nın üreme özellikleri araştırılmıştır. Balık örnekleri 2013 yılının Ocak-Aralık ayları arasında farklı ağ göz açıklıklarına (36-100 mm) sahip sade uzatma ağlarıyla aylık olarak yakalanmıştır. Araştırma süresince Uzunçayır Baraj Gölü'nden yakalanan 385 adet C. trutta bireyinin 218 adedini (%57.00) erkek, 167 adedini (%43.00) ise dişi bireylerin oluşturduğu ve populasyonun I-XII yaş grupları arasında dağılım gösterdiği saptanmıştır. GSİ değerlerinin mayıs ayında maksimuma ulaştığı, sperm ve yumurtalarını mayıs-temmuz ayları arasında bıraktıkları tespit edilmiştir. Yumurta çapları 0.30-1.07 mm arasında değişmiştir. Fekondite-total boy ve fekondite-ağırlık arasındaki ilişkileri açıklayan denklemler sırasıyla; F= 29.708*TL593.36 (N= 35, r= 0.27), F= 9.6448*W+5488.3 (N= 35, r= 0.38) olarak hesaplanmıştır. C. trutta bireylerinin yaş gruplarına göre yumurta veriminin 1362-15428 arasında değiştiği belirlenmiştir. Eşeysel olgunluk boyu dişi bireylerde 20.77 cm, erkek bireylerde 19.35 cm olarak tespit edilmiştir
AtıfTR Dizin2
İncele - MakaleAçık Erişim2018Reproduction Biology of Capoeta trutta (Heckel, 1843) in the Uzuncayir Dam Lake
Gündüz, Fatih; Çoban, M. Zulfu; Yüksel, Fahrettin; Demirol, Ferhat; Alpaslan, Kenan; Alp, Ahmet
In the study, on the purpose of contribute to sustainable fisheries strategies. the reproductive characteristics of Capoeta trutta in Uzuncayir Dam Lake were investigated. The fish samples were caught from Uzuncayir .Dam Lake by using gill nets with different mesh sizes (36-100 mm) between January - December 2013. During research period, a total of 385 C t mita samples that were caught from Uzuncayir Dam Lake yielded 167 female (43.00%) and 218 male (57.00%) with an age composition of population varied from I to XII age groups. GSI values reached a maximum in May and rapidly declined after that month, and it can be concluded that C trutta in Uzuncayir Dam Lake deposites its sperms and eggs between May-July. Egg size varied between 0.30-1.07 mm in dimeter. The relationships between fecundity-total length and fecundity-total weight were determined respectively as r= 29.708*TL-593.36 (N= 35. r= 0.27), F = 9.6148*W+5488.3 (N= 35. r= 0.38). The fecundity of C trutta individuals changed from 1362 to 15428 according to age groups. Sexual maturity length was determined as 20.77 cm and 19.35 cm for female and males. respectively.
AtıfWoS1OpenAlex3
İncele - MakaleYalnız künye2016Some Growth Parameters of Chub (Squalius cephalus) Living in Uzunçayır Dam Lake (Tunceli-Turkey)
Yüksel, Fahrettın; Çoban, Mehmet Zülfü; Yildiz, Nurettin; Kurtoğlu, Mehtap; Demirol, Ferhat; Gündüz, Fatih
This study was carried out in Uzunçayır Dam Lake between May 2011 and September 2012. A total of 334 specimens (169 male, 161 female and 4 juvenile) of Squalius cephalus (Linnaeus, 1758), which ranged between 0-XI age groups, were investigated in study and male/female ratio was determined to be 1:0.95. Total length values ranged from 13.00 to 36.20 cm for males, from 13.60 to 33.80 cm for females; weight values ranged from 25.82 to 616.00 g for males, from 22.10 to 494.00 g for females; condition factor values ranged from 1.041 to 1.233 for males and from 0.890 to 1.298 for females. Length-weight relationship equation was determined as W= 0.0073TL3.1357 (R2=0.95) for all population. The von Bertalanffy growth parameters of population were calculated as L∞=40.29 cm, K=0.16 year-1, t0=-1.76 year, W∞=800.46 g
AtıfTR Dizin9İncele - MakaleYalnız künye2016Some Population Parameters of Mirror Carp (Cyprinus carpio L., 1758) Inhabiting Atatürk Dam Lake
Yüce, Songül; Şen, Dursun; Çoban, M. Zülfü; Alpaslan, Kenan; Çelik, Burcu; Aydin, Rahmi; Demirol, Ferhat; Gündüz, Fatih
This study was conducted at Atatürk Dam Lake between April 2011-March 2012. In this study, a total of 231 (106 female, 125 male) Cyprinus carpio L., 1758 samples were analyzed. It was determined that samples were ranged between I-X age groups and male/female ratio was determined as 1.18:1 Total length values were ranged between 13.5-59.2 cm for males, 14.6-59.3 cm for females; weight values were ranged between 53.2-4662.5 g for males, 56.4-4668.0 g for females; condition factor values were ranged between 1.182-4.175 for males and 1.251-3.514 for females. Length-weight relationship for males W=0.0346*TL2.807(R2=0.95), female W=0.0246*TL2.8922 (R2=0.96) and in general population W=0.0295*TL2. 8472 (R2=0.95) were detected. VBBD (von Bertalanffy growth equation) for all population parameters L?=111.01, K=0.06, t=-1.48, W?=19746.57 and natural mortality (M) is determined as 0.1671. The highest average Gonadosomatic index values were determined in April for both sexes. Egg diameter values were measured between 0.60-1.33 mm, and the highest average value was found in April (1.27 mm). Reproduction period was determined between April-July. Fecundity values was calculated between 13468-885762. The first maturation was determined to be in age group III (30.848 cm in total length) for males and in age group IV (32.099 cm in total length) for females
AtıfTR Dizin4İncele - MakaleYalnız künye2015Keban Baraj Gölü Kerevit (Astacus leptodactylus Eschscholtz, 1823) Avcılığında Hedef Dışı ve Iskarta Av Oranlarının Belirlenmesi
Yüksel, Fahrettin; Yildirim, Tacettin; Çoban, M. Zülfü; Küçükyılmaz, Mehmet; Kurtoğlu, Mehtap; Ber, Abdulmutalip; Demirol, Ferhat; Gündüz, Fatih
Bu çalışma, Keban Baraj Gölü'nde yapılan kerevit (Astacus leptodactylus Eschscholtz, 1823) avcılığında hedef dışı ve ıskarta av miktarının tespiti amacıyla yapılmıştır. Araştırma kapsamında, bölgede yaygın olarak kullanılan "D" formlu, tek girişli, çift venterli, 5 çemberli ve germeli olarak yapılandırılmış, 36 mm göz açıklığına sahip 200 adet kerevit pinteri kullanılmıştır. Keban Baraj Gölü'nde ticari olarak kerevit avcılığı yapılan; Keban, Ağın ve Çemişgezek avlak sahalarında 2012 yılının Haziran - Ağustos ayları arasında toplam 17 avcılık operasyonu gerçekleştirilmiştir. Bölgede ticari kerevit avcılığı yapan balıkçılarla anket çalışması yapılarak, pinterler ile yakalanan hedef dışı ve ıskarta avların türleri belirlenmiştir. Avcılık denemelerinde hedef tür olan A. leptodactylus dışında 14 farklı türden bireyler yakalanmıştır. Çalışma süresince avlanan toplam 186 kg ürünün, 29,2 kg'ı (% 15,66) hedef av, 2 kg'ı (% 0,91) tesadüfi av, 155 kg'ı (% 83,43) ise ıskarta av olarak sınıflandırılmıştır. Keban Baraj gölü kerevit avcılığında ıskarta oranı 5,33 olarak hesaplanmıştır. Bir başka ifadeyle yasal av boyunda (>=10 cm) 1 kg kerevit yakalayabilmek için 5,33 kg ıskarta av yapıldığı tespit edilmiştir. Iskarta ölüm oranı Acanthobrama marmid türü için % 14,9, diğer türler için % 0,3, tüm türlerin geneli için ise % 10,8 olarak hesaplanmıştır.
AtıfTR Dizin3İncele - MakaleYalnız künye2014Some Population Parameters of Capoeta trutta (Heckel, 1843) in Uzunçayır Dam Lake (Tunceli)
Yüksel, Fahrettın; Demyrol, Ferhat; Kurto?lu, Mehtap; Çoban, M. Zülfü; Yildiz, Nurettin; Gündüz, Fatih
This study was carried out in Uzunçayır Dam Lake between May 2011—September 2012. total of 349 individuals (222 male, 127 female) of Capoeta trutta (Heckel, 1843) investigated in study, samples was determined which ranged between l-XII age groups and male/female ratio was determined to be 0.57. Total length values ranged from 17.2 to 41 cm for males, from 21.4 to 43 .1 cm for females; weight values ranged from 48.0 to 612.0 for males, from 86.0—747.0 for females; condition factor values ranged from 0.65 to 1.297 for males and from 0.627 to .433 for females. However, length—weight relationship equation was determined as W: 0.0096TL2'9856 (R2 0.93) for males, W: 0.0052TL3'1644 (R2 0.93) females and W: 0.0082TL3'0327 (R2:0.94) for all population. The VBBD parameters were found L,: 49.58, K: 0.09, to: -4.00, W7 1109.06 and natural mortality rate (M) 0.236 for all population.
AtıfTR Dizin3İncele - MakaleAçık Erişim2013Scopus SJRQ3Leslie Population Estimation for Turkish Crayfish (Astacus leptodactylus Esch., 1823) in the Keban Dam Lake, Turkey
Yüksel, Fahrettin; Demirol, Ferhat; Gündüz, Fatih
The population size was researched by using Leslie method on the zones of Keban Dam Lake where crayfish is fished for commercial purposes. The data were compiled by using effort expended and catch obtained by 28 fishing boats during 2012 crayfish fishing season. 28 fishing boats fished 16,867 kilograms of crayfish during the fishing season by using 45,600 pieces of crayfish fyke nets. It is determined that the quantity catch per unit effort (CPUE) varies between 2.74 to 6.35 kg/100 fyke nets/week during the 9 weeks fishing period. The population size at the beginning was estimated to be 28,450 kg (at minimum legal length of >= 10 cm). The 95% confidence interval of this estimation was calculated to be 25,607-32,533 kg. Similar researches on crayfish populations concluded that removal method can offer very important details.
AtıfWoS11OpenAlex13İncele
