Dietary phosphorous and protein supplementation enhances seawater growth and reduces severity of vertebral malformation in triploid Atlantic salmon (Salmo salar L.)

Diploid (2N) and triploid (3N) sibling post-smolts were divided between six sea pens and fed: a standard commercial nutrient package diet (2×2N SP, 2×3N SP), or an iso-energetic nutrient boosted (higher dietary protein and phosphorous) package (2×3N BP) until market size. 3N groups initially grew si...

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Bibliographic Details
Published in:Aquaculture
Main Authors: Smedley, Marie, Clokie, Benjamin G J, Migaud, Herve, Campbell, Patrick, Walton, Jamie, Hunter, Dougie, Corrigan, David, Taylor, John
Other Authors: Institute of Aquaculture, University of Stirling, BioMar U.K., BioMar Ltd, Mowi (Scotland), orcid:0000-0002-5404-7512, orcid:0000-0003-4370-7922
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2016
Subjects:
Triploid
Salmon
Phosphorous
Nutrition
Deformity
Atlantic salmon
Salmo salar
Online Access:http://hdl.handle.net/1893/22323
https://doi.org/10.1016/j.aquaculture.2015.10.001
http://dspace.stir.ac.uk/bitstream/1893/22323/1/AQUA-S-15-01110.pdf
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Summary:Diploid (2N) and triploid (3N) sibling post-smolts were divided between six sea pens and fed: a standard commercial nutrient package diet (2×2N SP, 2×3N SP), or an iso-energetic nutrient boosted (higher dietary protein and phosphorous) package (2×3N BP) until market size. 3N groups initially grew significantly faster than 2N, and by harvest, 3N BP weighed significantly more (3210±87g) than 2N SP or 3N SP (3007±64g; 2965±88g), while there was no significant difference in weight between ploidy in SP diet. Higher visible vertebral (9.6±0.4%) and jaw deformities (10.6±1.2%) were observed in 3N compared to 2N (0.9±0.1%; 1.3±0.5%). However, x-ray radiography revealed that 3N BP and 2N SP had comparable levels of severely affected individuals at time of sea transfer, while 3N SP showed a 3 fold increase in the severity of malformed individuals. The tail region (R3) in 3N SP fish had both the lowest vertebral strength and stiffness and the highest number of deformed vertebrae. Fillet quality attributes were comparable between diet and ploidy. These findings show that triploid growth rate can be sustained until harvest throughout the seawater phase, and more importantly the progression of spinal deformity beyond that at sea transfer can be stabilised by increasing dietary P during the marine phase.

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