Ferit RAD, A. Sezai BOZAOĞLU, Gülderen KURT

Effects of spatially localized and dispersed patterns of feed distribuion on the growth, size dispersion and feed conversion ratio of the African catfish (Clarias gariepinus)

Bu çalışmada lokalize ve dağınık yem dağıtım şeklinin karabalıklarmın büyüme, ağırlık dağılımı ve yemden yararlanma oranı üzerindeki etkileri araştırılmıştır. Ortalama başlangıç ağırlıkları 82,16 ± 4,80 ve 82,40 ± 3,90 g olan iki grup balık iki aylık bir denemede sırasıyla nokta ve dağınık yemlemeye tabi tutulmuşlardır. Deneme sonunda dağınık yemlemeye tabi tutulan balıklar 192,69 ± 6,60 grama ulaşırken, nokta yemleme grubunda ortalama ağırlık 169,67 ± 6,80 g olarak bulunmuştur (P < 0,05). Spesifik büyüme oranı dağınık ve nokta yemleme gruplarında sırasıyla % 1.51 $gün^{-1}$ ve % 1.29 $gün^{-1}$ olarak hesaplanırken, yemden yararlanma oranı dağınık yemlenen grupta 1,86, nokta yemleme grubunda ise 2,29 olarak saptanmıştır, iki grubun ağırlık bakımından varyasyon katsayıları arasındaki fark istatistiksel olarak önemsiz bulunmuştur (P > 0,05). Ancak dağınık yemlemenin uygulandığı grupta ağırlık dağılım eğrisinin daha simetrik olduğu ve bireylerin büyük çoğunluğunun ortalama çevresinde kümeleştiği gözlenmiştir.

Lokalize ve dağınık yem dağıtım bicimlerinin karabalığın (Clarias gariepinus) büyüme, ağırlık dağılımı ve yem dönüşüm oranı üzerine etkisi

The effects of spatially localized and spatially dispersed feeding patterns on the growth, size distribution and feed conversion ratio of the African catfish were investigated. Two groups of fish with an initial weight of 82.16 ± 4.80 and 82.40 ± 3.90 g were subjected to point source and scatter feeding patterns, respectively, for 2 months. Scatter fed fish reached a final mean weight of 192.69 ± 6.60 g while the mean final weight of point source fed fish was 169.67 ± 6.80 g ( P < 0.05). The specific growth rates of scatter and point source fed fish were 1.51% $day^{-1}$ and 1.29% $day^{-1}$, respectively. The feed conversion ratio of scatter fed fish was 1.86 and that of point source fed fish was 2.29. The difference between the coefficient of size variation for scatter and point source fed fish was statistically insignificant (P > 0.05). However, the final size distribution curve for the scatter fed group showed a more symmetrical pattern with the bulk of the fish clustering about the mean.

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