Published 2002

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Publication details

Journal : Aquaculture , vol. 211 , p. 215–225–11 , 2002

Publisher : Elsevier

International Standard Numbers :
Printed : 0044-8486
Electronic : 1873-5622

Publication type : Academic article

Contributors : Sørensen, Mette; Ljøkjel, Kari; Storebakken, Trond; Shearer, Karl Douglas; Skrede, Anders

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Kjetil Aune
Chief Librarian


A fish meal/wheat flour based dry ingredient mix was extruded at three different temperatures (100, 125 and 150 °C), by varying extrusion conditions according to two different methods. Employing method 1, the temperature of the conditioner, torque, screw speed, pressure, feed rate and process water of the extruder were varied. Whereas in method 2, conditioner temperature and screw speed were kept constant, and the variation in process water input was restricted. The diets, which contained yttrium oxide as an inert maker, were fed to three replicate groups of rainbow trout. Feces for digestibility determination were obtained by stripping. The results showed that the differences in extrusion temperature caused no significant differences in apparent digestibilities of crude protein, individual amino acids or energy. The apparent digestibility of cysteine was significantly higher for diets produced by method 1 than by method 2.