Interrelationship of photoperiod with growth performance and feeding of seawater farmed rainbow trout, (Oncorhynchus mykiss)

Bu çalışmada, deniz suyu koşullarında yavru gökkuşağı alabalığına (Oncorhynchus mykiss, ortalama ağırlık 27,39±0,16 g) uygulanan 4 farklı fotoperiyotun (Aydınlık/Karanlık saat) (11 saat aydınlık: 13 saat karanlık; Kontrol grubu; 24 saat aydınlık: 0 karanlık sürekli ışık grubu; 18 saat aydınlık: 6 saat karanlık; uzatılmış aydınlık grubu ve 6 saat aydınlık: 18 saat karanlık; kısaltılmış aydınlık grubu) balıkların büyüme performansı ve yem değerlendirmesi üzerine etkisi araştırılmıştır. Sekiz hafta süren denemede, balıklar ticari bir yemle doyuncaya kadar beslenmişlerdir. Sürekli ışığa tabi tutulan grupta günlük büyüme oranı, oransal büyüme oranı, spesifik büyüme oranı ve yem etkinliği daha iyi bulunmuştur (P

Anahtar Kelimeler:

yem çevirimi, yem alımı, kültür balığı, balık beslenmesi, fotoperiyodizm, alabalık, diyetler, yemden yararlanma, büyüme oranı, fotoperiyot, gökkuşağı alabalığı, deniz suyu

Deniz suyu ortamında yetiştirilen yavru gökkuşağı alabalığının (Oncorhynchus mykiss) büyüme performansı ve yem değerlendirimi ile fotoperiyod ılişkisi

Juvenile of rainbow trout (Oncorhynchus mykiss, weight 27.39±0.16 g) were reared under four photoperiods (Light/Dark hour) (11L:13D control group; 24L:0D continuous light group; 18L:6D extended light group and 6L:18D short light group) to examine their growth performance and some feeding parameters in sea water conditions. Fish were fed on a commercial diet until satiation for 8 weeks of the trial. Fish exposed to 24L:0D (continuous light group) had a significantly higher daily growth rate, relative growth rate and specific growth rates followed by 18L:6D, 11L:13D and 6L:18D photoperiods (P<0.05). The results demonstrated that the growth performance and feed utilization of rainbow trout can be stimulated clearly by using a continuous (24L:0D) or extended light (18L:6D) photoperiods in sea water.

Keywords:

feed conversion, feed intake, fish culture, fish feeding, photoperiodism, trout, diets, feed conversion efficiency, growth rate, photoperiod, rainbow trout, sea water,

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