Search

Amaç: Bu çalışmada Karasu Deresi’nde yaşayan Barbus cyclolepis Heckel, 1837 ve Gobio bulgaricus Drensky, 1926 türlerinin bazı büyüme özellikleri mevsimsel olarak incelenmiştir.Materyal ve Yöntem: Örnekleme mevsimlik olarak (Ağustos 2017, Kasım 2017, Ocak 2018, Şubat 2018, Nisan 2018) elektroşok aracılığıyla gerçekleştirilmiştir. Her mevsimi temsil edecek örneklemeler arka arkaya 3 gün tekrarlanmıştır. Elde edilen B. cyclolepis ve G. bulgaricus bireylerinin boy, ağırlık, yaş, eşey dağılımları, yaş-boy, yaş-ağırlık, boy-ağırlık ilişkileri ve Fulton kondisyon faktörü değerleri incelenmiştir.Bulgular: İncelenen B. cyclolepis bireyleri 0-III yaş gruplarındadır. Standart boy değerleri 3,5-13,5 cm; ağırlık değerleri ise 1,2232-50,8213 g arasında değişmiştir. Dişi:erkek oranı 1:0,94 olarak saptanmıştır. Tüm bireylerde; boy-ağırlık ilişkisi W= 0,0253*SL2,9226 olarak belirlenmiştir. Yaşa göre en düşük kondisyon faktörü değeri, III yaş grubunda (1,982) dişi bireylerde, en yüksek kondisyon faktörü değeri I yaş grubunda (2,288) erkek bireylerde bulunmuştur. G. bulgaricus türünün yaş dağılımı ise I-IV yaş grupları arasında değişmektedir. Standart boy değerleri 2,5-9,6 cm; ağırlık değerleri ise 0,2989-18,3014 g arasında değişmiştir. Dişi:erkek oranı 1:1,56 olarak saptanmıştır. Tüm bireylerde; boy-ağırlık ilişkisi W= 0,0209*SL3,0081 olarak belirlenmiştir. Yaşa göre en düşük kondisyon faktörü değeri, II yaş grubunda (1,950) erkek bireylerde, en yüksek kondisyon faktörü değeri IV yaş grubunda (2,191) dişi bireylerde bulunmuştur.Sonuç: Bu çalışma sonucunda Karasu deresinde yaşayan Barbus cyclolepis ve Gobio bulgaricus türlerinin kimi büyüme özellikleri ilk defa incelenmiştir., Objective: In this study, some growth characteristics of Barbus cyclolepis Heckel, 1837 and Gobio bulgaricus Drensky, 1926 species living in Karasu Stream, were investigated.Materials and Methods: Sampling was carried out seasonal (August 2017, November 2017, January 2018, February 2018, April 2018) via electroshock. Samplings representing each season were repeated for 3 consecutive days. Lenght, weight, age, sex distributions and ratios, age-length, age-weight, length-weight relationships, Von Bertalanffy parameters, Fulton condition factor values of the obtained B. cyclolepis and G. bulgaricus individuals were analyzed.Results: The examined B.cyclolepis individuals are in the 0-III age groups. Standard length values are 3.5-13.5 cm; The weight values varied between 1.2232-50.8213 g. The female: male ratio was determined as 1: 0.94. In all individuals; Length-weight relationship was determined as W= 0.0253*SL2.9226.According to age, the lowest condition factor value was found in female individuals in the III age group (1.982), and the highestcondition factor value was found in male individuals in the I age group (2.288).The age distribution of G. bulgaricus species varies between I-IV age groups. Standard length values are 2.5-9.6 cm; The weightvalues varied between 0.2989-18.3014 g. The female: male ratio was determined as 1:1.56. In all individuals; Length-weightrelationship was determined as W= 0.0209* SL3.0081. According to age, the lowest condition factor value was found in maleindividuals in the II age group (1.950), and the highest condition factor value was found in female individuals in the IV age group(2.191).Conclusion: As a result of this study, some growth characteristics of Barbus cyclolepis and Gobio bulgaricus species living inKarasu stream were investigated for the first time.

A field-based study of the reproductive aspects of Round-scaled barbel biology took place in the Stryama River, during the autumnal season of the period 2010–2011. This is the first study of the reproduction of this species. A total of 202 Round-scaled barbels were caught by electrofishing. The study found that both sexes reach sexual maturity in their second year. Females became sexually mature, once they reach 94 mm length and 13 g weight. Males became sexually mature once they reach 60 mm length and 12 g weight. Fecundity ranged from 460 to 18.420 eggs. Average fecundity was 6.944 eggs. Absolute fertility was positively correlated with the growth of fish length and mass. Consequently, five years old fish had the highest fertility rate. The average values of relative fecundity were 210 eggs per kilo. The reproductive parameters are an indicator of the growth conditions of the river, as well as the reproductive patterns and state of the fish population. The population parameters, established by this study, now represent a reference point, enabling a monitoring of the species’ population dynamics.

The aims of the study are to determine what the organisms Barbus cyclolepis consume as food in its feeding environments and to compare prey consumption with prey abundance in the environment. The study was conducted in the Istranca Stream located in Istanbul (Turkey) during the spring and summer of 2012. A total of 142 B. cyclolepis specimens were captured and it is determined that 94 of them had full digestive tracts. Diet analyses of B. cyclolepis showed that its food spectrum consisted of 11 different food types, and the species was found to feed on insects, mainly Diptera (IRI%= 92.26%). The most abundant macroinvertebrate organisms in the environment were Diptera and Gastropoda. The electivity index of B. cyclolepis was positive for Diptera in the spring (E= 0.49), but the value was below the expected value of 0.6 for high selectivity. The electivity values for other macroinvertebrate groups, consumed in low proportions, were negative. In summer, the fish fed on Diptera, Plecoptera, and Trichoptera, but a high electivity index value was found only for Trichoptera (E= 0.87). Results showed that B. cyclolepis mainly consumed Diptera as food and did not consume Gastropoda, although it is the second most abundant macroinvertebrate group in the environment. A relationship was determined between the proportion of food groups consumed in the digestive tracts of fish and the ratios of macroinvertebrates in the environment, and as a result, it was specified that the fish was selective on Diptera.