Maintenance energy requirements in rainbow trout (Oncorhynchus mykiss W., 1792) fed at largely varying feeding intensities

Geniş yoğunluk aralıklarında beslenmiş gökkuşağı alabalıklarında (Onchorhynchus mykiss Walbaum, 1792) enerji gereksiniminin sağlanması. Bu çalışmada alabalıklarda yaşam ve verim payı için enerji ihtiyaçları araştırıldı. Yapılan 4 deneyde; geniş besleme aralığında (doygunluktan açlık sınırındaki kısıtlı yemlemeye kadar), farklı enerji seviyelerindeki (düşük ve yüksek) yemlerle beslenen, farklı başlangıç ağırlıklarına sahip (25 gr, 31gr, 65 g, 101 g, 176 g) ve yaşlarda (1,2 yaş) gökkuşağı alabalıkları kullanıldı. Su sıcaklığı 15°C olarak sabit tutuldu. En kısa süreli deney 50, en uzun süreli olanı 229 gün sürdü. Yem enerji ve besin maddeleri sindirimleri belirlendi. Deneme öncesi ve sonrasında homojenize edilmiş balıkların enerji, protein ve yağ oranları belirlendi. Sonuç olarak BWX sabiti 0.21 olarak bulundu. Vücut ağırlık kazanımıyla depolanan enerji için kullanılan kısmi sindirilebilir enerji (BW sabiti 0.21 olarak hesaplandığında) tüketimi verimi 0.76 bulundu.

Anahtar Kelimeler:

yemleme, gökkuşağı alabalığı, vücut ağırlığı, sınırlı yemleme, sindirilebilir enerji

Geniş yoğunluk aralıklarında beslenmiş gökkuşağı alabalıklarında (Onchorhynchus mykiss Walbaum, 1792) enerji gereksiniminin sağlanması

This study examined the maintenance and growth energy requirements of rainbow trout. In four experiments, trout of different ages (1 and 2) with different initial body weights (25g, 31 g, 65g, 101g, 176g) were fed with different energy diets (high or low), on a wide range of feeding intensities (from satiation to restrictive feeding near hunger levels). Experiments lasted 50 days for the shortest and 229 days for the longest. Water temperature maintained at 15°C. Energy and nutrient digestibilities were measured. Energy as well as protein and fat content were determined of the fish before and after the experiments from body homogenates. It is concluded that exponent of BWX is 0.21. Retained energy as function of digestible energy (DE) intake (BW was raised to the power of 0.21), showed that partial efficiency of DE intake for retention was 0.76.

Keywords:

feeding, rainbow trout, body weight, restricted feeding, digestible energy,

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