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Fish oils and human diet

J R Sargent1

  • 1NERC Unit of Aquatic Biochemistry, Department of Biological and Molecular Sciences, University of Stirling.

The British Journal of Nutrition
|July 1, 1997
PubMed
Summary

Oily fish are vital sources of essential omega-3 fatty acids, like docosahexaenoic acid and eicosapentaenoic acid. Fish farming can produce high-quality fish rich in these beneficial nutrients, supporting human health and sustainable resource use.

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Area of Science:

  • Marine biology
  • Human nutrition
  • Aquaculture

Background:

  • Global fish catch trends, UK fish consumption, and the essential roles of n-6 and n-3 polyunsaturated fatty acids (PUFAs) in human diets.
  • Oily fish are highlighted as key dietary sources of long-chain omega-3 PUFAs: docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA).
  • The marine food web, from phytoplankton to zooplankton and fish, is the origin of these crucial omega-3 fatty acids.

Purpose of the Study:

  • To examine the origin and transmission of omega-3 PUFAs in marine ecosystems.
  • To understand the factors influencing the fatty acid composition of fish body oils.
  • To evaluate the potential of fish farming for enhancing dietary intake of essential fatty acids and sustainable resource management.

Main Methods:

  • Review of global fish catch data and UK consumption patterns.
  • Analysis of the biochemical pathways for n-3 PUFA synthesis and transfer in marine food webs.
  • Examination of fatty acid manipulation in fish feeds and its impact on farmed fish oil composition.
  • Comparison of nutrient profiles in farmed versus wild fish, particularly regarding long-chain omega-3 PUFAs.

Main Results:

  • Fish body oil composition is significantly influenced by dietary fatty acid profiles.
  • Aquaculture practices, such as feeding fish meal and fish oil, can yield products with high levels of DHA and EPA.
  • Farmed salmon in Scotland demonstrate comparable or superior long-chain n-3 PUFA levels to wild fish.
  • Farming fish with high-quality marine oils is an effective strategy for delivering essential nutrients and utilizing marine bioresources.

Conclusions:

  • Fish farming offers a sustainable method to increase the availability of essential omega-3 fatty acids in human diets.
  • Optimizing aquaculture feeds can enhance the nutritional value of farmed fish, benefiting public health.
  • Controlled fish farming contributes to the efficient utilization of limited marine bioresources while ensuring high-quality nutrient delivery.

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