Alanärä, Anders
- Department of Aquaculture, Swedish University of Agricultural Sciences
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
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