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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 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 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 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.
