These are shrimps of any type, but the term refers to the way they are conserved, packed and sold.

Very often shirmps are frozen - sometimes even on the ships at sea immediately after they are caught, but they may also be sold in plastic tubs (spande) - ranging from small for consumers or large for the catering industry.

If you click the roll-down for product categories here:
http://www.cateringforum.dk/produkt.php

You will find ´lagerrejer´ as an option, and if you then press SØG you will come to the types of package produced by Royal Greenland. (Rejer i lage)