Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2007.3722.3725Oncorhynchus mykiss)]]>AllamehSayed KamaleddinSoofianiNasrollah MahboobiPourrezaJavad 1220071020The present research carried out to measure digestible (DE) and Metabolizable Energy (ME) for fishmeal and soybean meal in rainbow trout with two different sizes (120 and 220 g mean body weights). DE and ME are evaluation systems for feedstuffs and also, necessary for diet formulation. The fishes were maintained in metabolic chamber with single ingredient assay of feeding and chromic oxide (Cr2O3) was used as an external marker using total fecal collection method. Gross energy and chromic oxide values measured in feces, fishmeal and soybean meal. The results indicated that DE of fishmeal was 3700 and 3591 kcal kg-1 in 120 and 220 g body weight rainbow trout, respectively. Soybean meal had 3004 and 2889 kcal kg-1 respectively. Calculated ME from DE were 3204 and 3110 kcal kg-1 for fishmeal and 2601 and 2502 kcal kg-1 for soybean meal in 120 and 220 g rainbow trout, respectively. The results showed that rainbow trout can utilize fishmeal more efficiently than soybean meal.]]>Azevedo, P.A., J. van Milgen, S. Leeson and D.P. Bureau,2005energy utilization by Rainbow trout (Oncorhynchus mykiss) and Atlantic salmon (Salmo salar) using factorial and multivariate approaches.]]>83842851Bailey, J. and A. Alanärä,2006251438455Cravedi, J.P., J. Tulliez, G. Choubert and P. Luquet,1983323944De Silva, S.S. and T.A. Anderson,1995Pages: 319Pages: 319Glencross, B., D. Evans, K. Dods, P. McCafferty and W. Hawkins, R. Maas and S. Sipsas,2005Oncorhynchus mykiss, using either stripping or settlement fecal collection methods.]]>245211220Glencross, B., W. Hawkins, D. Evans, N. Rutherford, K. Dods, P. McCafferty and S. Sipsas,2007Oncorhynchus mykiss).]]>265218229Henrichfreise, B. and E. Pfeffer,199267143147Jobling, M.,1994Vol. 13,Lovell, T.,1989Murray, D., E. Ayoleke, D. Ogunkoya, M. Janz and A.G. Van Kessel,2007Oncorhynchus mykiss).]]>267260268De La Noue, J. and G. Choubert,198550103112NRC,1993Ozogul, Y., J.I. Ahmad, M. Hole, F. Ozogul and S. Deguara,2006Onchorynchus mykiss).]]>96549561Poorreza, J.,2006Raven, P.A., H. Robert, H. Devlin and D.A. Higgs,2006Oncorhynchus kisutch).]]>254730747Shirmohammad, F., J. Poorreza, N. Msoofiyani and A. Samie,19971997Talbot, C.,19901990Tibbetts, S.M., J.E. Milley and S.P. Lall,2006Gadus morhua (Linnaeus, 1758).]]>26113141327Wang, Y., J.L. Guo, K. Li and D.P. Bureau,2006Nibea miichthioides).]]>252421428Willoughby, S.,1999Yusefi, M.S.,2000