Abstract: Manufacture of intermediate food products and/or of textured finished products that have been puffed to a greater or lesser extent from hydrated animal proteins without the addition of additives or emulsifiers and/or texturizing agents, which are stable to heat treatment, involving the following succession of steps: (1) a raw initial pulp (A4) is prepared from fish fillets; (2) a series of operations is performed to lead to the production of stabilized pulp (B9) which may or may not be kept in the frozen state; (3) this stabilized pulp is introduced into an evacuated stuffer (110) to be fed into a cold-regulated twin-screw extruder (111) with contra-rotating screws, in which a succession of steps of filling (111A) which may or may not be accompanied by the incorporation of mixing additives (112A/B), of mixing (111B) with a view to homogenizing the ingredients, of shearing (111C) so as to increase the number of potential protein re-attachment sites, of puffing (111 E2with incorporation of air or gas, then of c