⁎ Corresponding author at: Department of Animal Nutrition and Management,
Swedish University of Agricultural Sciences, P.O. Box 7024, SE-75007 Uppsala, Sweden.
Tel.: +46 18 67 21 07; fax: +46 18 67 29 95.
E-mail address: jan.erik.lindberg@slu.se (J.E. Lindberg).
0044-8486/$ – see front matter © 2012 Elsevier B.V. All rights reserved.
http://dx.doi.org/10.1016/j.aquaculture.2012.08.010