Abstract

Groups of 125 rainbow trout, Oncorhynchus mykiss (Walbaum) were fed identical daily feed rations using various portion sizes (0.23-4.29 pellets fish(-1) portion(-1)). The procedure was repeated for rearing temperatures of 5 degrees C, 10 degrees C, and 15 degrees C. Throughout the study, growth rates and feed conversion ratios (FCR) were best when a portion size of 0.52 pellets per fish was used As temperature increased, good growth rates and FCR were observed over a broader range of portion sizes (0.52-3.11 pellets per fish) than previously seen at 5 degrees C, indicating a high level of plasticity in the trout's ability to adjust to different portion sizes at higher temperatures. This study suggests that the temperature of the water should be considered when feed portion sizes are decided upon as the rate at which trout are able to catch pellets appears to be influenced by temperature. (C) 2005 Elsevier B.V. All rights reserved

Keywords

Portion size; Feeding intensity; Feed management; Oncorhynchus mykiss; Rainbow trout; Temperature

Published in

Aquaculture
2006, Volume: 253, number: 1-4, pages: 728-730
Publisher: ELSEVIER SCIENCE BV

SLU Authors

• Alanärä, Anders

  • Department of Aquaculture, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Fish and Aquacultural Science


Publication identifier

DOI: https://doi.org/10.1016/j.aquaculture.2005.09.026

Permanent link to this page (URI)

https://res.slu.se/id/publ/9547