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Potential of Thraustochytrids to Partially Replace Fish Oil in Atlantic Salmon Feeds
journal contribution
posted on 2023-05-16, 14:23 authored by Christopher CarterChristopher Carter, Bransden, MP, Lewis, TE, Nichols, PDThe replacement of fish oil with a dried product made from thraustochytrid culture, a marine microorganism, in canola-oil-based diets for Atlantic salmon was investigated. Salmon (37 g) were fed for 51 days on diets containing only canola oil, canola oil and fish oil, or canola oil and the thraustochytrid. There were no significant differences in final weight (106.1 ± 1.1 g), weight gain (69.6 ± 1.1 g), feed consumption (16.5 ± 0.2 mg dry matter g-1 d-1), feed efficiency ratio (1.15 ± 0. 03 g g-1), or productive protein value (51.2% ± 1.7%) between the diets. Nor were there any significant differences in whole-body chemical composition, organ somatic indices, or measures of immune function. However, following transfer to seawater and 2 challenges with Vibrio anguillarum, cumulative mortality was significantly lower in fish fed some fish oil than in those fed the 2 diets containing no fish oil. In conclusion, the thraustochytrid had no detrimental effects on the performance of salmon but, at the current inclusion of 10%, failed to confer the same effect as fish oil under challenging conditions.
History
Publication title
Marine BiotechnologyVolume
5Issue
5Pagination
480-492ISSN
1436-2228Department/School
Institute for Marine and Antarctic StudiesPublisher
Sspringer-VerlagPlace of publication
New York, USARepository Status
- Restricted