Derya GÜROY, Feyza SANVER, Kut Betül GÜROY, Şükran CİRİK, Ahmet Adem TEKİNAY

Ulva rigida ve Cystoseira barbata Unlarının Yem Katkı Maddesi Olarak Nil tilapya Balıklarında Büyüme Performansı, Yem Kullanımı ve Vücut Kompozisyonu Üzerine Etkileri

12 haftal›k bir besleme çal›flmas›nda, juvenil Nil tilapya bal›klar›nda alg unlar›n›n yem tüketimi, büyüme ve besin de¤erlendirme üzerine etkileri araflt›r›lm›flt›r. Bu çal›flmada Nil tilapyas› için Cystoseira barbata ilk defa yem ilavesi amac›yla kullan›lm›flt›r. Çeflitli seviyelerde Ulva unu (% 5, % 10 ve % 15) veya Cystoseira unu (% 5, % 10 ve % 15) ilave edilerek formüle edilmifl yemler ile bal›klar doyana kadar yemlenmifltir. Alg unu içermeyen bir yem kontrol yemi olarak haz›rlanm›flt›r. % 15 Ulva içeren yemle beslenen grup d›fl›ndaki di¤er deneme gruplar› aras›nda büyüme bak›m›ndan önemli bir fark olmamas›na ra¤men (P > 0,05), en yüksek a¤›rl›k art›fl› de¤erleri s›ras›yla Cystoseira % 5, kontrol ve Ulva % 5 ile beslenen gruplarda kaydedilmifltir. En düflük yem dönüflüm oran› Ulva % 15 yemi ile beslenen bal›klarda görülmüfltür (P < 0,05). Yemlerde alg unu seviyelerinin artmas›yla a¤›rl›k art›fl›, enerji ve protein kullan›m›nda azalma e¤ilimi gözlenmifltir. Yap›lan karkas analizleri, yemlere ilave edilen Cystoseira unu seviyesinin artmas›yla vücut ya¤ seviyesinin artt›¤›n›, Ulva seviyesinin artmas›yla da vücut ya¤ seviyesinin azald›¤›n› ortaya ç›karm›flt›r (P < 0,05). Sonuçlar, Cystoseira barbata ve Ulva rigida unlar›n›n tilapya yemlerinde az miktarda kullan›labilece¤ini göstermifltir.

Anahtar Kelimeler:

Oreochromis niloticus, alg unu, Ulva rigida, Cystoseira barbata, yem katk› maddesi, büyüme performans›, yem kullan›m›, vücut kompozisyonu

Effects of Ulva rigida and Cystoseira barbata Meals as a Feed Additive on Growth Performance, Feed Utilization, and Body Composition of Nile Tilapia, Oreochromis niloticus

In a 12-week feeding trial, the effect of 2 algae meals (Ulva rigida or Cystoseira barbata) on feed intake, growth, and nutrient utilization of juvenile Nile tilapia, Oreochromis niloticus, was investigated. This was the first attempt to utilize Cystoseira barbata as a feed supplement for Nile tilapia. The fish were fed to apparent satiation with formulated diets supplemented with various levels of Ulva meal (5%, 10%, or 15%) or Cystoseira meal (5%, 10%, or 15%). A diet without algae meal served as a control diet. The highest values for weight gain were for fish fed the 5% Cystoseira diet, control diet, and 5% Ulva diet (156%, 151%, and 150%, respectively), but the values were not significantly different (P > 0.05) compared to other treatments, except for the fish fed on the 15% Ulva diet (P < 0.05), which exhibited the lowest weight gain. Fish fed the diet containing 15% Ulva meal showed the poorest feed conversion ratio (FCR). Protein and energy utilization tended to decrease in the groups fed the algae meals at the highest supplementation level of 15%. Carcass lipid levels decreased with increasing levels of Ulva meal, while an increase in carcass lipid level with increasing levels of Cystoseira meal was observed (P < 0.05). The results suggested that Ulva rigida or Cystoseira barbata meals could be used in small percentages in tilapia diets.

Keywords:

Oreochromis niloticus, algae meal, Ulva rigida, Cystoseira barbata, feed supplement, growth performance, feed utilization, body composition,

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