Angers, 16 January 2018: Nor-Feed’s dry grape extract, Nor-Grape 80® is an advanced antioxidant solution for shrimps during the starter period, when associated to vitamin E, according to a recent trial carried out in Taiwan.

Shrimp: a major production in aquaculture

Shrimp is a major production in aquaculture. Mainly raised in 50 countries, its production ranks second in the aquaculture industry, in value. According to the FAO, world shrimp consumption increased from 0.4 kg/person in 1961 to 1.8 kg/person in 2013.

Litopenaeus vannamei, known as the Pacific white or whiteleg shrimp, is the most widely cultured shrimp in the western hemisphere.

Nor-Feed carried out a trial to evaluate the effect of a supplementation with Nor-Grape 80 on the growth performances of the Pacific White shrimp, at an early stage. The dry grape extract is considered here as an alternative to vitamin E, even though the complete replacement of vitamin E is not common.

Nor-Grape 80 is a dry grape extract registered as a feed additive in the European Union and many jurisdictions around the world, able to provide a powerful antioxidant effect to optimize the vitamin E utilization.

Material and methods

The 8 weeks trial was carried out in the Department of Aquaculture of the National Taiwan Ocean University in Keelung.

5 groups were constituted: (n=45/group)

  • Control Group: 100 ppm vitamin E
  • NG1”: 0 ppm vitamin E + 50 ppm Nor-Grape
  • NG2”: 0 ppm vitamin E + 100 ppm Nor-Grape
  • NG3”: 0 ppm vitamin E + 150 ppm Nor-Grape
  • NG4”: 0 ppm vitamin E + 200 ppm Nor-Grape

Shrimps initial size was 20 mg (post-larvae stage) and weight gain, Feed Conversion Ratio (FCR) and survival rate were recorded.

Better FCR and weight gain

The replacement of vitamin E with Nor-Grape led to an improvement of the FCR in all supplemented groups, despite the fact vitamin E was totally removed.,. No difference was observed in terms of mortality between groups.

Nor-Grape in Shrimps Results











These results suggest a strong interest for the use of Nor-Grape 80 in the diet of young shrimps, even if completely replacing dietary vitamin E is usually not advised.

About Nor-Feed

Since 2003, Nor-Feed invents, manufactures and markets natural plant extracts for animal nutrition and health. Nor-Feed is focused on a short product portfolio; our products are standardized, documented and efficient, with sustainable development principles. Nor-Feed provides its clients with technical, marketing and regulatory support.