Tülay ALTUN, Filiz ÇELİK, DURALİ DANABAŞ

Testosteronandekonatın tilapia (Oreochromis niloticus L., 1758)'nın gelişimi ile karaciğer ve böbrek dokularına etkisi

Bu çalışmada, ortalama 14,43± 0,75g ağırlık ve 9,39± 0,18 cm total boy uzunluğundaki tilapia (Oreochromis niloticus)’lar, 90 gün boyunca 0 (kontrol), 15 ve 30 mg hormon / kg yem oranlarında testesteronandekonat (TU) içeren yemlerle beslenmişlerdir. Ayda bir örnekleme yapılmış ve her örnekleme döneminde balıkların canlı ağırlık (W), total boy (L) ölçümleri alınmıştır. Balıkların deneme sonu günlük canlı ağırlık kazancı (DGR), spesifik büyüme oranı (SGR) ve kondisyon faktörü (C) ortalamaları hesaplanmıştır. Karaciğer ve böbrek dokularının histolojik analizi yapılmıştır. Deneme sonunda W ortalamaları gruplara göre sırasıyla, 38,62±4,18 g, 39,90±3,42 g, 40,48±2,00 g; L ortalamaları ise yine sırasıyla 13,40±0,53 cm, 13,47±0,33 cm, 13,49±0,49 cm olarak bulunmuştur. Gruplardaki balıkların deneme sonu DGR ortalamaları sırasıyla 0,27±0,04, 0,28±0,02, 0,29±0,03 g’dır; SGR ortalamaları ise 1,09±0,01, 1,13±0,06, 1,15±0,01; C ortalamaları 1,61±0,91, 1,63±0,93, 1,67±0,08 olarak belirlenmiştir. Gruplar arasında büyüme parametreleri açısından istatistiksel olarak bir fark bulunmamıştır (P>0,05). Histolojik incelemede karaciğer ve böbrek dokusunda değişimler gözlenmiştir. Balık gelişimine etki etmemesi ve dokularda histolojik değişiklikler oluşturması nedeniyle, O. niloticus türünde testosteronandekonat uygulamasının uygun olmayacağı sonucuna varılmıştır.

Anahtar Kelimeler:

böbrekler, karaciğer, testosteron, canlı ağırlık, Oreochromis niloticus, yem katkı maddeleri, balık beslenmesi, doku bilimi, Tilapia, büyüme performansı

Effect of testosteroneundeconoate on growth and liver and kidney tissues of tilapia (Oreochromis niloticus L., 1758)

Effect of testosteroneundeconoate on growth and liver and kidney tissues of tilapia (Oreochromis niloticus L., 1758). In this study, tilapia (O. niloticus) (mean 14.87± 0.75 g body weight and 9.51± 0.18 cm total length) was fed with feed containing 0 (control), 15, 30 mg testosteroneundeconoate (TU)/ kg feed during 90 days. Sampling was carried out monthly. Body weight (W) and total length (L) of the fish in each group were measured in each sampling periods. At the end of the experiment, daily growth rate (DGR), specific growth rate (SGR) and condition factor (C) of the fish in each group were calculated. Histological structures of the liver and kidney tissues were investigated. At the end of experiment, mean W values of the groups were 38.62±4.18 g, 39.89±3.42 g, 40.48±2.00 g; mean L values were 13.40±0.53 cm, 13.47±0.33 cm, 13.49±0.49 cm; DGR values of the fish were 0.27±0.04 g, 0.28±0.02 g, 0.29±0.03 g; SGR values, 1.09±0.01, 1.13±0.06, 1.15±0.01, respectively. Mean C values of the groups 1.61±0.91, 1.63±0.93, 1.67±0.08, respectively. Differences among the growth parameters of the groups were insignificant (P>0.05). Histologically, differences on the liver and the kidney tissues were observed. It was concluded that TU in these doses were unproper to O. niloticus because of not being effect on fish growth and having effects on histologies of tissues.

Keywords:

kidneys, liver, testosterone, liveweight, Oreochromis niloticus, feed additives, fish feeding, histology, Tilapia, growth performance,

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