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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, PD
The 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 Biotechnology

Volume

5

Issue

5

Pagination

480-492

ISSN

1436-2228

Department/School

Institute for Marine and Antarctic Studies

Publisher

Sspringer-Verlag

Place of publication

New York, USA

Repository Status

  • Restricted

Socio-economic Objectives

Fisheries - aquaculture not elsewhere classified

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