Yazar "Ekmekçi, Fitnat Güler" seçeneğine göre listele
Listeleniyor 1 - 16 / 16
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Comparison of growth and reproduction of mirror carp and scaled carp introduced into Gelingullu Reservoir, Yozgat, Turkey(Scientific Technical Research Council Turkey-Tubitak, 2013) Kırankaya, Şerife Gülsün; Ekmekçi, Fitnat GülerCarp have been translocated and introduced outside of their natural range in many countries. In Turkey, mirror carp (a warmwater fish) has generally been introduced into man-made reservoirs for fishery management, regardless of geographic location and climatic conditions. During the previous decade, controversy has arisen concerning the adaptation and spawning of carp, and the success of such introduction practices in Central Anatolia, which is characterized by typical cold continental weather conditions. Concurrently, based on some irregular observations, scaled carp was reintroduced as an alternative to mirror carp. Long-term monitoring studies on the growth and reproduction of mirror carp and scaled carp introduced into reservoirs are necessary for effective fishery management. This study aimed to compare the growth and reproduction of mirror carp and scaled carp populations in Geling Reservoir. A total of 796 mirror carp and 285 scaled carp were caught between June 2002 and July 2005. Scaled carp reached up to 61.9 cm in fork length (FL) at age 8+ whereas mirror carp could reach to a maximum of 71.5 cm in FL at age 9+. The data show that mirror carp had a better growth rate and higher fecundity than scaled carp. Introduction of mirror carp may be recommended for fishery management applications under continental climate conditions.Öğe Condıtıon, Length-Weıght And Lengthlength Relatıonshıps For Fıve Fısh Specıesfrom Hırfanlı Reservoır, Turkey(2014) Kırankaya, Şerife Gülsün; Ekmekçi, Fitnat Güler; Yalçın, Şükran Özdilek; Yoğurtçuoğlu, Baran; Gençoğlu, LaleHirfanlı Baraj Gölü'nde Yaşayan Beş Balık Türünün Kondisyonu, Boy-Ağırlık ve Boy-Boy İlişkileri Sunulan çalışmada, Hirfanlı Baraj Gölü (İç Anadolu Bölgesi)'nde yaşayan 5 balık türünün -Pseudorasbora parva, Atherina boyeri, Aphanius danfordii, Tinca tinca, and Cyprinus carpio- kondisyon, boy-ağırlık ve total boy (TL), çatal boy (FL) ve standart boy (SL) arasındaki boyboy ilişkileri belirlenmiştir. Balık örnekleri Mart ve Kasım 2008 arasında ığrıp ağları kullanılarak yakalanmıştır. Boy-ağırlık ilişkisindeki b değeri C. carpio'da 2.896 ve A. danfordii'de 3.67 arasında değişmektedir. Bütün türlerde b değeri 3'ten sapma göstermekte ve A. danfordii, A. boyeri, P. parva, and T. tinca'da pozitif allometrik büyüme görülmektedir. Fulton kondisyon faktörü 0.604 (A. boyeri) ile 1.721 (A. danfordii) arasında değişmektedir. Boy-boy ilişkileri önemli derecede doğrusaldır.Öğe The Current Status of Gibel Carp and Sand Smelt in Turkey's Inland Fisheries(2017) Ekmekçi, Fitnat Güler; Kırankaya, Şerife Gülsün; Atalay, M. AltuğTürkiye, sahip olduğu tatlısu kaynakları sayesinde, önemli bir içsu balıkçılığı potansiyeline sahiptir. Türkiye tatlısu balık faunası yaklaşık 340 tür içermesine rağmen; içsu balıkçılığı, toplam avın %78'ini oluşturan başlıca (yerli türlerden inci balığı- Alburnus tarı'chi ve sazan-Cyprinus carpio, yabancı türlerden gümüşi havuz balığı-Carassius gibeliove denizlerden tatlısulara taşınan gümüş balığı-Atherina boyeri) dört türe bağımlıdır. Gümüşi havuz balığı ve gümüş balığının ekonomik önemi olmasına rağmen, her iki tür de Türkiye içsularında istilacı olarak kabul edilmektedir. Sazamn iç pazarda gördüğü talep ve ticari değeri daha yüksek ve içsu balıkçılık ekonomisine katkısı (%37), gümüş balığı (%4) ve gümüş havuz balığı (%4)'n1n katkısından daha fazla olmakla birlikte; günümüzde, sazan ve inci balığının av oranı gittikçe düşerken, gümüş balığı ve gümüşi havuz balığının av oranı artmaktadır. Gümüşi havuz balığının ve gümüş balığı iç pazarda tüketihnemekte, diğer ülkelere ihraç edilmektedir. Bu iki türün Türkiye'de tatlısu ekosistemleri ve balıkçılık açısından olumsuz etkiler yarattığı düşünülmektedir. Sürdürülebilir içsu balıkçılığmı garanti altma almak ve ekolojik etkileşimlerin tam olarak anlaşılmasını sağlamak üzere, balıkçılık yapılan sistemlerdeki ekolojik, balıkçılık ve sosyo-ekonomik yapı ile ilgili bilgi boşluğunun acilen doldurulmasına ihtiyaç vardır.Öğe Feeding ecology of the KA +/- zA +/- lA +/- rmak toothcarp, Aphanius marassantensis: ontogenetic shift and seasonal diet variation(Springer, 2018) Yoğurtçuoğlu, Baran; Kırankaya, Şerife Gülsün; Gençoğlu, Lale; Ekmekçi, Fitnat GülerWe studied the feeding ecology of an endemic cyprinodontid fish, Aphanius marassantensis (KA +/- zA +/- lA +/- rmak Toothcarp), with special emphasis on seasonal and ontogenetic diet shift. The dietary composition revealed an omnivorous diet with great seasonal and ontogenetic variation. Cladocera and Calanoid Copepods (Diaptomus sp.) dominated the diet in Spring and Summer, whereas the food items of plant origin e.g. filamentous algae and diatoms were the most important components in Autumn and Winter. An ontogenetic diet shift was also demonstrated. While the feeding of juveniles was based mostly on planktonic organisms, adult individuals preferred larger prey taxa, such as Gammarus sp. and Gastropods. There was no significant sex-related variation in feeding with the exception for the volume of gut content. The investigation on the feeding strategy of A. marassantensis suggested a generalised feeding pattern with some specialised individuals. This generalist feeding habits may account for the well-established population of this species in a big reservoir under coexistence of two non-native fish species, Pseudorasbora parva and Atherina boyeri.Öğe Feeding ecology of the topmouth gudgeon pseudorasbora parva (Temminck and Schlegel, 1846) in the Gelingüllü Reservoir, Turkey(2013) Yalçın, Şükran Özdilek; Kırankaya, Şerife Gülsün; Ekmekçi, Fitnat GülerPseudorasbora parva (Temminck and Schlegel, 1846) Türkiyedeki göl ve akarsulara istenmeden karışarak geniş bir dağılım gösterir. Türkiye tatlı su balık çeşitliliği bakımından doğal ihtiyofauna elemanları arasında bu şekildeki istilacıların hassaslaştıracağı çok sayıda endemik tür içerir. Gelingüllü Barajı Orta Anadoluda Kızılırmak üzerinde yer alır ve endemik türler de dahil olmak üzere doğal ve istilacı türler ile zengin bir ihtiyofaunaya sahiptir. P. parva örneklerinin ön bağırsak içerikleri 2003-2005 arasında toplanan örneklerde incelendi. Beslenme şiddetindeki mevsimsel ve ontogenetik değişiklikler belirlendi. P. parva bireyleri başlıca Cladocera, Copepoda ve Rotifera gibi zooplanktonlarla beslenmektedirler. Yaz boyunca P. parva bireylerinin ön bağırsaklarında yüksek oranda Bacillariophyta ve Cyanobacteria üyelerine rastlandı. Bu istilacı balık türünün Gelingüllü Barajında başarılı bir populasyon kurmasında beslenme özellikleri etkili olabilir.Öğe Feeding Ecology of the Topmouth Gudgeon Pseudorasbora parva (Temminck and Schlegel, 1846) in the Gelingullu Reservoir, Turkey(Central Fisheries Research Inst, 2013) Özdilek, Şükran Yalçın; Kırankaya, Şerife Gülsün; Ekmekçi, Fitnat GülerPseudorasbora parva (Temminck and Schlegel, 1846) is widely distributed in rivers and lakes of Turkey owing to accidental introductions. Turkey is rich in biodiversity of freshwater fish and has a high level of endemicity of native ichthyofauna, which is vulnerable to such introductions. The Gelingullu Reservoir located on the Kizilirmak drainage in Central Anatolia has rich ichthyofauna with native and introduced fish species, including endemic species. The contents of the foregut of P. parva samples collected between Summer 2003 and Summer 2005 were examined. Seasonal and ontogenetic changes in feeding intensity were determined. P. parva mainly feeds on zooplankton such as Cladocera, Copepoda, and Rotifera. Members of the Bacillariophyta and Cyanobacteria were identified in high proportions in the foregut contents of P. parva particularly during summer. The feeding traits of this invasive fish may have an influence on the establishment of a successful population in Gelingullu reservoir.Öğe Feeding Properties of the Translocated Marine Fish Sand Smelt Atherina boyeri Risso, 1810 (Atherinidae) in a Freshwater Reservoir(Inst Zoology, Bas, 2017) Gençoğlu, Lale; Kırankaya, Şerife Gülsün; Yoğurtçuoğlu, Baran; Ekmekçi, Fitnat GülerThe feeding ecology of the translocated marine fish sand smelt Atherina boyeri was studied in Hirfanli Reservoir, a freshwater dam lake located in Central Anatolia. The data revealed that the sand smelt fed mainly on larger zooplankton, such as adult copepods and cladocerans. Fish eggs and juvenile fish were also found in the stomach content. There was a considerable dietary overlap among size groups larger than 30 mm total length. Larger individuals have also cannibalistic behaviour as they consumed juveniles of sand smelt. The proportion of empty stomachs was maximum in winter and minimum in summer. The trophic niche breadth was the highest in summer. The results suggested that the sand smelt may have a remarkable impact on zooplankton communities in the Hirfanli Reservoir.Öğe Frequency of black spot disease in Cobitis cf. turcica from Pinarbasi Springs (Haymana, Turkey)(Inst Vertebrate Biology As Cr, 2011) Kırankaya, Şerife Gülsün; Ekmekçi, Fitnat GülerDuring a survey on the biology of Cobitis cf. turcica living in Pinarbasi Springs (Haymana district, Turkey), symptoms of black spot disease were frequently observed on the specimens. Of the 1295 loach collected, 240 (19 %) specimens were found to be infected with metacercaria of Posthodiplostomum cuticola, a common digenean parasite causing black spot disease in freshwater fish in Eurasia. During spring and autumn, the infection rate was significantly higher than during winter and summer, most probably due to the increasing density of migration of birds in this area. No statistically significant difference was found in condition, weight and length between infected and non-infected specimens; indicating low physiological effects of the encysted metacercaria on the host specimens. However, the prevalence of black spot had a tendency to decrease with age, remarking a higher mortality rate of infected specimens. This increased mortality rate seems to be the most important impact of an infection with metacercaria for a Cobitis population.Öğe Frequency of black spot disease in cobitis cf. turcica from pınarbaşı springs (Haymana, Turkey)(Czech Academy of Sciences, 2011) Kırankaya, Şerife Gülsün; Ekmekçi, Fitnat GülerDuring a survey on the biology of Cobitis cf. turcica living in Pınarbaşı Springs (Haymana district, Turkey), symptoms of black spot disease were frequently observed on the specimens. Of the 1295 loach collected, 240 (19%) specimens were found to be infected with metacercaria of Posthodiplostomum cuticola, a common digenean parasite causing black spot disease in freshwater fish in Eurasia. During spring and autumn, the infection rate was significantly higher than during winter and summer, most probably due to the increasing density of migration of birds in this area. No statistically significant difference was found in condition, weight and length between infected and non-infected specimens; indicating low physiological effects of the encysted metacercaria on the host specimens. However, the prevalence of black spot had a tendency to decrease with age, remarking a higher mortality rate of infected specimens. This increased mortality rate seems to be the most important impact of an infection with metacercaria for a Cobitis population.Öğe Growth and reproduction of a marine fish, Atherina boyeri (Risso 1810), in a freshwater ecosystem(Tubitak Scientific & Technical Research Council Turkey, 2016) Gençoğlu, Lale; Ekmekçi, Fitnat GülerAtherina boyeri (Risso, 1810) has established abundant and successful populations in inland waters in Anatolia, although it is known as a marine species. In this study, the growth and reproduction properties of A. boyeri in the Hirfanli Reservoir were studied. Age determinations based on scale readings showed that the population had a 4-year life cycle. Sampled individuals ranged between 5.76 and 115.65 mm in total length and 0.01 and 10.48 g in total weight. The von Bertalanffy growth parameters for females were L-infinity = 156.78, k = 0.197, and t(0) = -0.197; for males, L-infinity = 151.02, k = 0.148, and t(0) = -0.148. Mean condition factor values, estimated from eviscerated weight, varied between 0.49 and 0.60. The length-weight relationship of A. boyeri indicated allometric growth, whereas the b value for females, males, and juveniles was 3.29, 3.23, and 3.50, respectively. The sex ratio was 1:1.14 in favor of females. The reproductive season, evaluated by the gonadosomatic index, extended from May to July. Mature egg diameter ranged from 0.64 to 1.73 mm. The mean total fecundity increased with age. In the Hirfanli Reservoir, certain life-history features of A. boyeri, such as short life cycle and increasing fecundity, indicated that this species has the potential to become dominant in freshwater systems.Öğe Growth and reproduction of a marine fish, Atherinaboyeri Risso 1810,in a freshwater ecosystem(2016) Gençoğlu, Lale; Ekmekçi, Fitnat GülerAtherina boyeri (Risso, 1810) has established abundant and successful populations in inland waters in Anatolia, although it is known as a marine species. In this study, the growth and reproduction properties of A. boyeri in the Hirfanlı Reservoir were studied. Age determinations based on scale readings showed that the population had a 4-year life cycle. Sampled individuals ranged between 5.76 and 115.65 mm in total length and 0.01 and 10.48 g in total weight. The von Bertalanffy growth parameters for females were L∞ 156.78,k 0.197, and t0 0.197; for males, L∞ 151.02,k 0.148, and t0 0.148. Mean condition factor values, estimated from eviscerated weight, varied between 0.49 and 0.60. The lengthweight relationship of A. boyeri indicated allometric growth, whereas the b value for females, males, and juveniles was 3.29, 3.23, and 3.50, respectively. The sex ratio was 1:1.14 in favor of females. The reproductive season, evaluated by the gonadosomatic index, extended from May to July. Mature egg diameter ranged from 0.64 to 1.73 mm. The mean total fecundity increased with age. In the Hirfanlı Reservoir, certain life-history features of A. boyeri, such as short life cycle and increasing fecundity, indicated that this species has the potential to become dominant in freshwater systems.Öğe Growth and reproduction of a stream population of Cobitis turcica in central Anatolia ( Turkey)(Wiley, 2014) Kırankaya, Şerife Gülsün; Ekmekçi, Fitnat GülerCobitis turcica is endemic to Anatolia, and being of a bottom-dwelling nature is highly influenced by habitat degradation. Due to drought and water pollution, in 2006 this species was included in the IUCN Red List as endangered. Therefore in order to develop conservation strategies, knowledge of its life history traits is important. The study presents first time data on the basic life history traits of C.turcica captured in a small stream flowing from Pnarba Springs to Kozanl Gok Lake in central Anatolia. In total, 1356 specimens were caught between March 2003 and August 2004. The overall sex ratio (M:F) was 1:0.62. Longevity in females, which reaches a maximum age of 6+, is 1year longer than for males. Females are longer and heavier than males of the same age group. Maximum observed total lengths were 103.6mm in a 5+ year-old male and 126.75mm in a 6+ year-old female. Length-weight relationships were calculated for males, females, and juveniles, with the b exponent of the relationships as 2.9068, 2.8326, and 3.6859, respectively. Spawning was fractional, beginning in April and continuing until the end of July. Mean total fecundity was 2238 at age 5+.Öğe LIFE-HISTORY TRAITS OF THE INVASIVE POPULATION OF PRUSSIAN CARP, CARASSIUS GIBELIO (ACTINOPTERIGI: CYPRINIFORMES: CYPRINIDAE), FROM GELINGULLU RESERVOIR, YOZGAT, TURKEY(Wydawnictwo Akad Rolniczej W Szczecinie, 2013) Kırankaya, Şerife Gülsün; Ekmekçi, Fitnat GülerKirankaya S.G., Ekmekci F.G. 2013. Life-history traits of the invasive population of Prussian carp, Carassius gibelio (Actinopterigi: Cypriniformes: Cyprinidae), from Gelingullu Reservoir, Yozgat, Turkey. Acta Ichthyol. Piscat. 43 (1): 31-40. Background. Prussian carp, Carassius gibelio (Bloch, 1782), is one of the successful invaders of freshwater systems of Turkey. Although, Prussian carp has rapidly expanded its area of distribution in Anatolia during the last two decades, there is limited information about its biological features in new environments. In order to determine the impact of invasive species on ecosystem, the life history characteristics of an exotic fish species in different locations should be monitored. The presently reported study provides information about the growth and reproduction of Prussian carp introduced into a reservoir in Central Anatolia. Materials and methods. Age, growth, and reproduction of Prussian carp were studied during a 3-year period in Gelingullu Reservoir, Kizilirmak River Basin. A total of 344 specimens were caught by gill nets. Age was determined from scales. Length-weight relation, von Bertalanffy equation, and specific growth rate were used to evaluate the fish growth. In order to assess growth and reproduction patterns, fecundity, GSI, and variations in oocyte size were determined. Results. Both males and females reached a maximum age of 5+ years. Fork length was 6-27 cm in males and 5.6-26.8 cm in females. Both sexes matured during their second year of life (1+ year). In the Gelingullu Reservoir population the males were predominant the overall sex ratio was 1 : 0.73 (193 males to 139 females) and differed significantly from unity. The von Bertalanffy growth equation was L-t = 32.17 (1 - e(-0.232(t-0.094))) cm for males and L-l = 36.03 (1 - e(-0.212(t-0.205))) cm for females. Growth in length was approximately 70% in males and 85% in females during the first year of life. The somatic condition of the fish increased markedly during late spring and summer. A prolonged spawning period was observed from April to August. Maximum egg diameter was 1.51 mm and maximum absolute fecundity was 174 000 oocytes. Conclusion. Compared to previously published data, the studied Prussian carp population was characterized by more rapid growth during the first year of life, earlier maturity, higher fecundity, and a shorter life span. These life history characteristics are typical of invasive species.Öğe Natural thermal adaptation increases heat shock protein levels and decreases oxidative stress(Elsevier Science Bv, 2014) Oksala, Niku K.J.; Ekmekçi, Fitnat Güler; Özsoy, Ergi; Kırankaya, Şerife; Kokkola, Tarja; Emecen, Güzin; Atalay, MustafaHear shock proteins (HSPs), originally identified as heat-inducible gene products, are a family of highly conserved proteins that respond to a wide variety of stress including oxidative stress. Although both acute and chronic oxidative stress have been well demonstrated to induce HSP responses, Rae evidence is available whether increased HSP levels provide enhanced protection against oxidative stress under elevated yet sublethal temperatures. We studied relationships between oxidative stress and HSPs in a physiological model by using Garra rufa (doctor fish), a fish species naturally acclimatized to different thermal conditions. We compared fish naturally living in a hot spring with relatively high water temperature (34.4 +/- 0.6 degrees C) to those living in normal river water temperature (25.4 +/- 4.7 degrees C), and found that levels of all the studied HSPs (HSP70, RSPB, HSP90, HSC70 and GRP75) were higher in fish living in elevated water temperature compared with normal river water temperature. In contrast, indicators of oxidative stress, including protein carbonyls and lipid hydroperoxides, were decreased in fish living in the elevated temperature, indicating that HSP levels are inversely associated with oxidative stress. The present results provide evidence that physiologically increased HSP levels provide protection against oxidative stress and enhance cyLoprotection. (C) 2014 The Authors. Published by Elsevier B.V.Öğe Threatened Fishes of the World, Cobitis puncticulata (Erk'akan, Atalay-Ekmek double dagger i & Nalbant, 1998) (Cobitidae)(Springer, 2010) Ekmekçi, Fitnat Güler; Kırankaya, Şerife Gülsün; Turan, Davut…Öğe Threatened fishes of the world: Pseudophoxinus crassus (Ladiges, 1960) Cyprinidae, from Central Anatolia, Turkey(Springer, 2010) Ekmekçi, Fitnat Güler; Kırankaya, Şerife Gülsün…
