Bu çalışma, Sakarya Nehri'nin bir kolu olan İlhan Çayı üzerinde bulunan Asartepe Baraj Gölü'ndeki balık türlerinin tespiti amacıyla gerçekleştirilmiştir. Çalışma Mart 2015-Şubat 2016 tarihleri arasında yürütülmüştür. Balık örnekleri gölü temsil eden üç farklı istasyondan yakalanmıştır. Avlamalarda çeşitli göz açıklığına sahip ağlar ile göle dökülen akarsularda ise elektroşoker kullanılmıştır. Avlanan balık örnekleri %4'lük formaldehit içinde laboratuvara getirilerek metrik ve meristik özellikleri belirlenmiştir. Gölde beş familyaya ait on dört tür yaşamaktadır: Cyprinidae (Alburnoides kosswigi, Alburnus escherichii, Capoeta baliki, Carassius gibelio, Chondrostoma angorense, Cyprinus carpio, Pseudorasbora parva, Squalius pursakensis, Tinca tinca, Vimba vimba,), Cobitidae (Cobitis simplicispina), Esocidae (Esox lucius), Nemacheilidae (Oxynoemacheilus angorae) ve Percidae (Perca fluviatilis). Göle giriş şekli belirlenemeyen istilacı türlerden Carassius gibelio ve Pseudorasbora parva'nın diğer türler üzerindeki olası etkileri ve popülasyonların geleceği için biyoekolojik izleme çalışmalarının yapılması yararlı olacaktır.
Mogan Gölü'nde Ocak 2014-Aralık 2014 tarihleri arasında yürütülen bu çalışmada Cyprinus carpio'nun morfometrik ve meristik özellikleri ile boy-ağırlık ilişkileri araştırılmıştır. Vücut özelliklerinden standart boya oran değeri; göz çapında (% 3,63) en düşük, preanal mesafe (% 77,02) en yüksektir. Morfolojik ve meristik özelliklerin varyasyon katsayısı değerinde baş uzunluğu (% 14,02) ile omur sayısı (% 1,15) değerlerinin en düşük, dorsal yüzgeç yüksekliği (% 68,67) ile dorsal yüzgeç ve pelvik yüzgeç dallanmamış ışın sayıları (% 22,36) değerlerinin en yüksek olduğu saptanmıştır. Standart boy ile morfometrik özellikler arasındaki ilişkide kuyruk sapı yüksekliği (r 2 =0,34) değeri en düşük, preanal mesafe (r 2 =0,92) değeri en yüksektir. Boy-ağırlık ilişkisi W = 0,0349*L 2,7619 şeklindedir. Mogan Gölü Cyprinus carpio populasyununda büyümenin normal düzeyde olduğu belirlenmiştir.
Tinca tinca (L., 1758) grafted into Turkish inland waters in 1970 has shown constantly widening distribution since then. It is a locally consumed species with limited economic value. The elucidation of length-weigh relation, condition factor and biological features are of great importance in the determination of the effects of different habitats on particular species. T. tinca is regarded as an important species to be monitored among the fish taxa. This study was intended to study some biological aspects of T. tinca population in Asartepe Reservoir and to compare the results with the available information. The study has been carried out on 131 T. tinca species caught in Asartepe Reservoir between the periods of March 2015-February 2016. The morphometric and meristic properties and the ratio of some diagnostic features to the standard length were elucidated. The highest and the lowest variations observed among the morphometric features were in body length with 21.35% and eye diameter with 8.31%. The corresponding values for the meristic features were pectoral fin unbranched rays with 30.09% and number of vertebrae with 2.68%. The highest percentage relative to the standard length was found in predorsal distance with 56.95%. The age distribution of T. tinca population was between the ranges of 1-9 years of age. The average weight and length were found to be 520.58 ± 207.84 g (103-1,302 g) and 308.68 ± 41.38 mm (190-429 mm). The parameters of a and b of length and weight relation and the correlation coefficient were found to be 0.9692, 3.0522 and 1.6807 ± 0.1264 (1.4199-2.0368), respectively. The results indicate that the growth level of T. tinca population is satisfactory.
This study aimed to determine fish species in the Delice River, one of the main tributaries of the Kizilirmak River. The study was conducted at 22 stations between March 2019 and February 2020seasonally. An electrofisher device was used for fishing. The standard lengths of samples were measured in the field, a maximum of 40 samples of the species with a large number of individuals were selected and brought to the laboratory to determine morphometric and meristic characteristics and then other individuals were released back into the water. Sixteen species belonging to 9 families were found in Delice River; Cyprinidae (3) Barbus tauricus, Capoeta sieboldii, Capoeta tinca; Leuciscidae (4) Alburnoides freyhofi, Alburnus escherichii, Chondrostoma angorense, Squalius cephalus; Gobionidae (1) Pseudorasbora parva; Acheilognathidae (1) Rhodeus amarus; Cobitidae (1) Cobitis simplicispina; Nemacheilidae (3) Oxynoemachelius angorae, Oxynoemachelius brandtii, and Seminemacheilus lendlii; Aphaniidae (1) Anatolichthys marassantensis; Poeciliidae (1) Gambussia holbrooki, and Salmonidae (1) Onchorhynchus mykiss were identified. Nine endemic and two invasive species were identified in Delice River and its tributaries. It was determined that it would be beneficial to continue to monitoring studies for the future of the identified species.
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