Feyza SANVER

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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ARC (Agricultural Research Council). (1981) The Nutrient Requirements of Pigs. Commonwealth Agricultural Bureaux, Slough. Austreng, E., T. Storebakken, & T. Âsgard, (1987) Growth rate estimates for cultured Atlantic salmon and rainbow trout. Aquaculture, 60,157-160.

Beck, F. (1987) Untersuchungen zum Protein- und Erhaltungsbedarf der Regenbogenforelle (Salmo gairdneri Richardson.): Schaetzung der Hungerveıiuste. Dissertation Universitaet München, München, 143 pp.

Cho, C. (1992) Feeding systems for rainbow trout and other salmonids with refrence to current estimates of energy and protein requirements. Aquaculture, 100,107-123.

Cui, Y. and J. Liu, (1990) Comparison of energy budget among six teleosts - 2.Metabolic rates. Comp. Biochem.Physiol., 97A, 169-174.

Hepher, B. (1988) Nutrition of Pond Fishes. Cambridge University Press, Cambridge. Hogendoorn, H. (1983) Growth and production of the African . catfish, Clarias lazera.3. Bioenergetic relations of body weight and feeding level. Aquaculture, 35,1-17.

Huisman, E.A.(1976) Food conversion efficiencies at maintenance and production levels for carp, Cyprinus carpio, L and rainbow trout, Salmo gairdneri R. Aquaculture, 9,259-273.

Kirchgessner M., M.H. Zeitler and F.J. Schwarz (1984) Ansatz und Verwertung von Energie bei Karpfen (Cyprinus ca/p/o)mit unterschiedlicher Protein-und Energieversorgung. Z. Tierphysiol., Tierernâhr. U. Futtermittelkd., 49:88-98.

Lupatsch, 1, G. WM. Kissil, D. Sklan and E. Pfeffer (1998) Energy and protein requirements for maintenance and growth in gilthead sea bream (Spams aurata L). Aquaculture Nutrition, 4:165-173.

Lupatsch, I., G. WM. Kissil, D. Sklan (2003) Comparison of energy and protein efficiency among three fish species gilthead sea bream (Sparus aurata), European sea bass (Dicentrarchus labrax) and white grouper (Epinephelus aeneus): energy expenditure for protein and lipid deposition. Aquaculture, 225,175-189.

Rodehutscord, M. and E. Pfeffer (1999) Maintenance requirement for digestible energy and efficiency of utilization of digestible energy for retention in rainbow trout (Oncorhynchus mykiss). Aquaculture 179: 95- 107.

Sanver, Feyza (2004) Energy and Nitrogen balances in rainbow trout (Oncorhynchus mykiss) fed at largely varying feeding intensities. Cuvillier Verlag, Göttingen 2004.

Storebakken, T. and E. Austreng (1987) Ration level for Salmonids 1. Growth, Survival, Body composition, and Feed Conversion in Atlantic Salmon Fry and Fingeriings. Aquaculture, 60:189-206.