Structured lipids for fish feed for rainbow trouts

  • Jacobsen, Charlotte (Project Manager)
  • Nielsen, Nina Skall (Project Participant)
  • Nielsen, Henrik Hauch, (Project Participant)
  • Jørgensen, Jane (Project Participant)
  • Mu, Huiling, (Project Participant)
  • Göttsche, Jesper R. (Project Participant)
  • Xu, Xuebing (Project Participant)
  • Holm, Jørgen (Project Participant)

Project Details

Description

Intake of n-3 polyunsaturated fatty acids (PUFA) from fish is important for human health, due to the positive health effects of these PUFA. Feed for farmed fish has traditionally contained ingredients of marine origin high in n-3 fatty acids. However, marine resources might be in shortage for future feed production due to an increasing aquaculture production and stable or declining catches for fish-meal and -oil production.
Alternative sources of oil for fish feed have been investigated. Substitution of fish oil with vegetable oil may not affect the growth of fish, but will be reflected in the tissue of the fish by a reduced content of n-3 PUFA such as EPA and DHA. A major challenge is to influence fatty acid metabolism to save EPA and DHA for storage.
Medium chain fatty acids may preferably be oxidised to provide energy especially when positioned in the sn-1 and -3 positions as demonstrated in mammals. Due to the high fat content in the diets fat accumulation in trout is sometimes too high. In mammals, addition of diacylglycerols to the diet has been shown to reduce fat accumulation.
Objectives:
To determine the specificity of lipase in trout
To investigate whether it is possible to increase the relative incorporation of EPA in a low n-3 PUFA diet by feeding trout specific structured triacylglycerols with n-3 PUFA in the sn-2 position and medium chain fatty acids in the sn-1,3 positions
To investigate whether addition of diacylglycerols (DAG) in a fish diet could reduce fat accumulation in trout.
AcronymLipids for fish feed
StatusActive
Effective start/end date01/01/2004 → …