Tarım Bilimleri Dergisi Tar. Bil. Der. Dergi web sayfası: www.agri.ankara.edu.tr/dergi Journal of Agricultural Sciences Journal homepage: www.agri.ankara.edu.tr/journal TARIM BİLİMLERİ DERGİSİ — JOURNAL OF AGRICULTURAL SCIENCES 21 (2015) 144-151 Effect of Different Tank Colors on Growth Performance of Rainbow Trout Juvenile (Oncorhynchus mykiss Walbaum, 1792) Mustafa ÜSTÜNDAĞ a , Ferit RAD a a Mersin University, Fisheries of Faculty, Department of Aquaculture, Yenişehir, Mersin, TURKEY ARTICLE INFO Research Article DOI: 10.1501/Tarimbil_0000001315 Corresponding Author: Mustafa ÜSTÜNDAĞ, E-mail: ustundag_mustafa@yahoo.com, Tel: +90 (543) 265 00 79 Received: 09 February 2014, Received in Revised Form: 09 May 2014, Accepted: 06 June 2014 ABSTRACT Effects of four different fberglass tank colors i.e. beige, grey, dark green and light green on growth performance of rainbow trout (Oncorhynchus mykiss) juveniles (4.88±0.71 g) were investigated in this study. The study lasted for 60 days and was conducted under actual culture conditions in a commercial trout farm using spring water with an average temperature of 14.8 o C. Growth performance of fsh was evaluated in light of criteria such as mean fnal weight, specifc growth rate (SGR), feed conversion ratio (FCR), energetic growth effciency (EG), condition factor (K) and survival rate (SR). Mean fnal weight of fsh in beige colored tanks reached 76.26 ± 10.52 g while mean fnal weights of fsh in grey, dark and light green tanks were measured as 64.95 ± 6.94, 69.44 ± 8.81 and 68.87 ± 6.42 g, respectively. The differences between mean fnal weight of fsh in 4 experimental groups were found to be statistically signifcant (P<0.05). However, no signifcant differences were found in terms of growth performance criteria among 4 experimental groups (P>0.05). Highest live weight gain (71.38 g), SGR (4.58% day -1 ), EG (45.25%) and condition factor (1.14) as well as lowest FCR (0.90) were recorded in beige colored tanks. The poorest values of growth performance criteria were observed in fsh kept in grey tanks, while fsh in dark and light green tanks showed similar performances. Survival rates in experimental groups were similar and varied between 98.25% and 99.57%. In conclusion it can be specifed that under culture condition employed in this study and especially under low light intensities beige colored tanks are more suitable for rearing of rainbow trout fry. Keywords: Rainbow trout; Oncorhynchus mykiss (Wallbaum); Tank color; Growth performance Farklı Tank Renklerinin Gökkuşağı Alabalığı (Oncorhynchus mykiss Walbaum, 1792) Yavrularının Büyüme Performansı Üzerine Etkisi ESER BİLGİSİ Araştırma Makalesi Sorumlu Yazar: Mustafa ÜSTÜNDAĞ, E-posta: ustundag_mustafa@yahoo.com, Tel: +90 (543) 265 00 79 Geliş Tarihi:09 Şubat 2014, Düzeltmelerin Gelişi: 09 Mayıs 2014, Kabul: 06 Haziran 2014 ÖZET Bu çalışmada açık yeşil, bej, gri ve koyu yeşil olmak üzere 4 farklı cam takviyeli plastik (CTP) tank renginin, ortalama ağırlıkları 4.88±0.71 g olan gökkuşağı alabalığı (Oncorhynchus mykiss) yavrularının büyüme performansı üzerindeki etkileri araştırılmıştır. Çalışma 60 gün süre ile fili yetiştiricilik koşulları altında ve ortalama sıcaklığı 14.8 ºC olan