The effect of dietary krill supplementation on epithelium-associated bacteria in the hindgut of Atlantic salmon (Salmo salar L.): a microbial and electron microscopical study

Published source details Ringø Einar, Sperstad Sigmund, Myklebust Reidar, Mayhew TerryM., Mjelde Agnar, Melle Webjørn & Olsen RolfErik (2006) The effect of dietary krill supplementation on epithelium-associated bacteria in the hindgut of Atlantic salmon (Salmo salar L.): a microbial and electron microscopical study. Aquaculture Research, 37, 1644-1653.
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This study is summarised as evidence for the following.

	Action	Category
	Use an alternative protein source: krill Action Link

Use an alternative protein source: krill

In 2002, a replicated, controlled study in Norway (Ringø et al., 2006) found that salmon, Salmo salar, had similar final weights and feed conversion ratios when fed diets containing fish meal or fish meal and krill meal. Fish weighed an average of 105g at the start of the study and increased to 169.0g and 167.2 g in the fish meal and krill meal groups, respectively. Feed conversion ratios were 0.68 and 0.69, respectively. There was a difference in the composition and number of aerobic bacteria colonizing the hindgut of salmon between fish meal and krill meal diets (2.2 x 10⁶and 8.5 x 10⁴,respectively). Salmon were fed either a diet containing fish meal as the protein source (58.9% of the diet) or a diet containing a 1:1 mix of fish meal and krill meal (64%) for 46 days. Three hundred salmon were stocked in 1.5 m³ x 1.5 m³ x 1m³ fibreglass tanks for the duration of the experiment. On day 46, fish were anaesthetized and measured for weight and feed conversion.