Open AccessInsect‐based diets high in lauric acid reduce liver lipids in freshwater Atlantic salmon
Author(s) -
Belghit Ikram,
Waagbø Rune,
Lock ErikJan,
Liland Nina S.
Publication year - 2019
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/anu.12860
Subject(s) - hermetia illucens , lauric acid , biology , fish meal , food science , fish oil , fatty acid , meal , menhaden , insect , larva , biochemistry , botany , fishery , fish <actinopterygii>
Abstract We evaluated the effect of a diet containing insect meal and insect oil on nutrient utilization, tissue fatty acid profile and lipid metabolism of freshwater Atlantic salmon ( Salmo salar ). Insect meal and insect oil from black soldier fly larvae ( Hermetia illucens , L.; BSF), naturally high in lauric acid (12:0), were used to produce five experimental diets for an eight‐week feeding trial. 85% of the dietary protein was replaced by insect meal and/or all the vegetable oil was replaced by one of two types of insect oil. A typical industrial diet, with protein from fishmeal and soy protein concentrate (50:50) and lipids from fish oil and vegetable oil (33:66), was fed to a control group. The dietary BSF larvae did not modify feed intake or whole body lipid content. Despite the high content of saturated fatty acids in the insect‐based diets, the apparent digestibility coefficients of all fatty acids were high. There was a decrease in liver triacylglycerols of salmon fed the insect‐based diets compared to the fish fed the control diet. This is likely due to the rapid oxidation and low deposition of the medium‐chain fatty acid lauric acid.