Yemleme Seviyesi ve Stoklama Yoğunluğunun Sarıbenli Balığı, Barbus luteus, Yavrularının Gelişimi ve Yem Değerlendirmesi Üzerine Etkileri

Sarıbenli balığı yavrularının optimum besleme seviyesinin belirlenmesi amacıyla üç tekerrürlü iki stoklama yoğunluğu (20 ve 40 fry/80-l tank) ile 4 yemleme seviyesi (% 2,5, % 5,0, % 7,5, % 10,0)’den oluşan 60 günlük bir deneme kurulmuştur. Deneme boyunca su kalitesi parametrelerinden sıcaklık, çözünmüş oksijen, pH, toplam amonyak azotu izlenmiştir. Deneme sonu vücut ağırlığı ve spesifik büyüme oranı her iki stoklama yoğunluğunda da % 2,5 yemleme oranında belirgin olarak daha düşük bulunmuştur. Bununla beraber, diğer yemleme seviyeleri ve stoklama yoğunluklarında belirgin farklılıklar gözlenmemiştir. En iyi yem değerlendirme oranı (YDO) 1,37 ile % 2,5’luk yemleme oranı ve 40 fry/80 l’lik grupta elde edilmiştir. Ancak toplam ürün miktarı ve yaşam oranı dikkate alındığında, optimum YDO olan 1,5, % 5,0’lik yemleme seviyesi ve 40 fry/80 l’lik grupta sağlanmıştır. % 10,0’luk yemleme oranında yaşam oranı belirgin olarak düşmüştür. Su kalitesi parametreleri de günlük yemleme oranı ve stoklama yoğunluğu tarafından etkilenmiştir.

Anahtar Kelimeler:

Sarıbenli, yemleme seviyesi, stoklama yoğunluğu, büyüme performansı, yem değerlendirme, yaşama oranı

The Effects of Feeding Level and Stocking Density on the Growth and Feed Efficiency of Himri Barbel Fry, Barbus luteus (Heckel, 1843)

Two stocking densities (20 and 40 fry/80-l tank) with 4 feeding rates (2.5%, 5.0%, 7.5%, and 10.0% body weight/day) were used to determine the optimum feeding level for himri barbel fry during a 60-day culture period. Water quality parameters (temperature, dissolved oxygen, pH, and total ammonia nitrogen) were monitored during the experiment. Final body weight and specific growth rate (SGR) was significantly lower with the 2.5% feeding rate than with the others, at both stocking densities; however, no significant differences were observed between the other feeding rates and between stocking densities. The best feed conversion ratio (FCR) of 1.37 was achieved with the 2.5% feeding rate and stocking density of 40 fry/80 l; yet, in terms of total yield and survival the optimal FCR of 1.50 was obtained with the 5.0% feeding rate and 40 fry/80 l. At the 10.0% feeding rate survival rates were significantly lower. Both feeding ratio and stocking density also affected water quality parameters.

Keywords:

Himri barbel, feeding levels, stocking density, growth performance, feed conversion, survival rate,

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