Effect of different tank colors on growth performance of rainbow trout juvenile (Oncorhynchus mykiss Walbaum, 1792)

Bu çalışmada açık yeşil, bej, gri ve koyu yeşil olmak üzere 4 farklı cam takviyeli plastik (CTP) tank renginin, ortalamaağırlıkları 4.88±0.71 g olan gökkuşağı alabalığı (Oncorhynchus mykiss) yavrularının büyüme performansı üzerindekietkileri araştırılmıştır. Çalışma 60 gün süre ile fili yetiştiricilik koşulları altında ve ortalama sıcaklığı 14.8 ºC olan kaynak suyu kullanılarak ticari bir alabalık işletmesinde yürütülmüştür. Balıklarda büyüme performansı, ulaşılan soncanlı ağırlık, spesifk büyüme oranı (SGR), yem dönüşüm oranı (FCR), enerjitik büyüme etkinliği (EG), kondisyonfaktörü (K) ve yaşama oranı (SR) gibi ölçütler değerlendirilmiştir. Çalışma sonunda, bej renkli tanklarda tutulan balıklarortalama 76.26±10.52 g ağırlığa ulaşırken bu değer açık yeşil, gri ve koyu yeşil tanklarda sırasıyla 68.87 ± 6.42, 64.95± 6.94 ve 69.44 ± 8.81 g olarak tespit edilmiştir. Grupların son vücut ağırlığı ortalamaları arasındaki fark istatistikselolarak önemli bulunmuştur (P0.05) en yüksek canlı ağırlık artışı (71.38 g), SGR (4.58 % Gün -1), TGC (2.87), FCR (0.90) ve EG (% 45.25) değeri ile kondisyon faktörü (1.14) bej renkli tanklarda tutulan balıklardasaptanmıştır. Bu ölçütler açısından en düşük büyüme performansı ise gri renkli tanklarda gözlenmiştir. Açık ve koyuyeşil tanklardaki balıkların büyüme performansı birbirine yakın bulunmuştur. Deneme sonunda gruplarda saptananyaşama oranları birbirine yakın olup % 98.29 ile % 99.57 arasında değişim göstermiştir. Sonuç olarak bu çalışmanınyürütüldüğü koşullarda ve özellikle düşük ışık şiddeti altında bej renkli tankların gökkuşağı alabalığı yavrularınınyetiştiriciliği için daha uygundur.

Farklı tank renklerinin gökkuşağı alabalığı (Oncorhynchus mykiss Walbaum, 1792) yavrularının büyüme performansı üzerine etkisi

Effects of four different fberglass tank colors i.e. beige, grey, dark green and light green on growth performance of rainbowtrout (Oncorhynchus mykiss) juveniles (4.88±0.71 g) were investigated in this study. The study lasted for 60 days and wasconducted under actual culture conditions in a commercial trout farm using spring water with an average temperatureof 14.8 oC. 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). Meanfnal weight of fsh in beige colored tanks reached 76.26 ± 10.52 g while mean fnal weights of fsh in grey, dark and lightgreen tanks were measured as 64.95 ± 6.94, 69.44 ± 8.81 and 68.87 ± 6.42 g, respectively. The differences between meanfnal weight of fsh in 4 experimental groups were found to be statistically signifcant (P0.05). Highest live weightgain (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 inbeige colored tanks. The poorest values of growth performance criteria were observed in fsh kept in grey tanks, while fshin dark and light green tanks showed similar performances. Survival rates in experimental groups were similar and variedbetween 98.25% and 99.57%. In conclusion it can be specifed that under culture condition employed in this study andespecially under low light intensities beige colored tanks are more suitable for rearing of rainbow trout fry.

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