Effects of Starvation and Re-Feeding on Growth Performance and Feed Utilization of Rainbow Trout, (Oncorhynchus mykiss)

Yıl 2016, Cilt: 31 Sayı: 2, 48 - 52, 30.12.2016

Tayfun Karataş

Öz

In the present study, the effects of short-term
starvation and refeeding on growth and feeding performances of rainbow trout (Oncorhynchus mykiss) with an average
initial weight of 100±1 g were investigated. After 1 week adaptation to
experimental condition, 80 fish were randomly distributed in 4 fiberglass tanks
(3 replication) with a flow-through system. The fish were exposed to 4
different feeding regimes; control: fed two times daily; T1: 1 day starvation
and 1 days refeeding; T2: 2 day starvation and 2 days refeeding; T3: 3 days
starvation and 3 days refeeding. Short-terms starvation and refeeding was
continued for 60 days. At the end of the experiment, final weight, SGR
(specific growth rate), WG (weight gain), FCR (feed conversion ratio) and FER
(feed efficiency ratio) were determined in control and treated groups. The
highest values were observed in control and T1. The lowest values were observed
in the T3. The differences between final weight, SGR, WG, FCR and FER were
statistically insignificant. In conclusion, rainbow trout have showed a
complete compensatory growth depending on times starvation and re-feeding.

Anahtar Kelimeler

Rainbow trout, Oncorhynchus mykiss, growth, feeding regime

Gökkuşağı Alabalıklarının (Oncorhynchus mykiss) Besin Kullanımı ve Gelişim Performansı Üzerine Açlık ve Tekrar Beslemenin Etkileri

Öz

Bu çalışmada, 100±1 g ortalama başlangıç ağırlığına
sahip gökkuşağı alabalıklarının besin kullanımı ve gelişim performansı üzerine
açlık ve tekrar beslemenin etkileri araştırıldı. Deneme koşullarına
adaptasyondan 1 hafta sonra, 80 balık sabit akış sistemine sahip 4 fiberglas
tanka rastgele bir şekilde dağıtıldı. Balıklar 4 farklı besleme rejimine maruz
bırakıldı; Kontrol: hergün günde 2 kez besleme; T1: bir gün aç bir gün tekrar
besleme; T2: iki gün aç iki gün tekrar besleme; T3: üç gün aç üç gün tekrar
besleme. Kısa süreli açlık ve tekrar besleme 60 gün sürdü. Deneme sonunda,
final ağırlık, SBO (spesifik büyüme oranı), AK (ağırlık kazancı), YDO (Yem
değerlendirme oranı) ve YYO (yemden yararlanma oranı) kontrol ve muamele
gruplarında belirlendi. En yüksek değerler kontrol ve T1 grubunda gözlemlendi.
En düşük değerler ise T3 de gözlemlendi. Final ağırlık, SBO, AK, YDO ve YYO
değerleri arasında ki fark istatistiksel olarak önemsizdi. Sonuç olarak,
gökkuşağı alabalığı açlık ve tekrar besleme süresine bağlı olarak tam bir
telafi büyümesi göstermiştir.

Anahtar Kelimeler

Gökkuşağı alabalığı, Oncorhynchus mykiss, gelişim, besleme rejimi

Kaynakça

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