Insect-based diets high in lauric acid reduce liver lipids in freshwater Atlantic salmon

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. K E Y W O R D SAtlantic salmon, black soldier fly, fatty acid oxidation, lauric acid, lipid metabolism, mediumchain FA S U PP O RTI N G I N FO R M ATI O NAdditional supporting information may be found online in the Supporting Information section at the end of the article. How to cite this article: Belghit I, Waagbø R, Lock E-J, Liland NS. Insect-based diets high in lauric acid reduce liver lipids in freshwater Atlantic salmon. Aquacult Nutr. 2019;25:343-357.

Partially Defatted Hermetia illucens Larva Meal in Diet of Eurasian Perch (Perca fluviatilis) Juveniles

“…A similar trend was observed in studies of Jian carp [ 55 ] and rainbow trout [ 13 ], fed H. illucens larva meal. The positive effect on HSI observed in the present study could be related to reduction of lipid storage in liver, as was demonstrated in Atlantic salmon [ 54 ].…”

“…The differences among studies could be related to diet composition. In the present study, as well as those of Borgogno et al [ 53 ] and Renna et al [ 15 ], fish oil was used as a fat source, while Belghit et al [ 54 ], used large quantities of rapeseed oil, which contain high level of n-6 polyunsaturated fatty acids contributing to maintain constant the n-3/n-6 ratio between insect meal based diets.…”

Evaluation of black soldier fly larvae oil as a dietary fat source in broiler chicken diets

“…The SFA is the main FA in BSF derived oil and lauric acid (C12:0), palmitic acid (C16:0), and oleic acid (C18:1) are predominant FAs [4]. Moreover, the BSFL contains a high level of lauric acid which has an antimicrobial effect on gut pathogens [19][20][21]. Even though the partial replacement of BSFLO has shown no negative effects on growth performance and gut health, the BSFLO has a defect that alters the FA profile of the meat [6][7][8].…”

Larvae Mediated Valorization of Industrial, Agriculture and Food Wastes: Biorefinery Concept through Bioconversion, Processes, Procedures, and Products

“…The apparent digestibility coefficients (ADC) of fatty acids were high (ADC > 95%) in Atlantic salmon fed an insect-based diet, where the lipid fraction was BSFL oil, which is rich in medium-chain fatty acids like lauric acid. The high content of lauric acid in the insect-based diets led to inhibited lipid storage in the fish liver [63]. The partial or total replacement of soybean oil with supercritical CO2 BSFL fat extract applied in young turkey poult had no adverse effect on the growth performance, nutrient digestibility or selected internal organ weights and lengths.…”