Erfindungsgemäß wurde gefunden, dass ein sehr schonender Aufschluss Wertstoff-haltiger Zellen möglich ist, sofern die Zellen vor Durchführung des Zellaufschlusses aufgequollen werden.Disintegration of cells containing a valuable material, comprises swelling the cells before cell disintegration. Independent claims are included for: (1) producing the valuable materials, which is lipid comprising polyunsaturated fatty acids, using the cell disintegration method, comprising partially or completely removing cell debris after completion of cell disintegration (2) preparing food or feed comprising (a) providing a suspension of cells, preferably cells derived from Thraustochytriaceae and having less than 15 wt.%, preferably 1-9 wt.%, where the suspension of the cells has a moisture content of at least 30 wt.%, preferably 40-80 wt.%, (b) performing cell disintegration using a rotor-stator system at a energy of up to 50 kWh/t, preferably 3-15 kWh/t, (c) mixing of disrupted cells and/or recyclable materials isolated from the cells with other food or feed ingredients, and (d) performing extrusion (3) the recyclable material obtainable by the above method (4) the food or feed obtainable by the above method and (5) animal, particularly finfish or crustacean.
