the software of the computer the size of the pieces is calculated based on these information and there from the cutting pattern the software of the device contains information on the shape of a plurality of fillets and the position of the pin bones in these fillets as well as pre calculated cutting patterns which are compared to the image of the fillet being processed the accurate position of the fillet is known and the cutting device is controlled by the computer and fillet is portioned into desired pieces and the pin bones are removed by making a three dimensional model of the fillet it is possible to use the information for grading with respect to shape size and the weight of the fillets or the products and use the information for later processing the scanning process is also used to define and chose the optimal cutting pattern according to the size and shape of the fillet the water cutting is performed in a fillet with the skin attached to it the pin bones are removed and the fillet is then portioned as desired a high pressure water beam is used for the water cutting such as a 2000 2500 bar pressure which is guided through a cutting nozzle such as 0 12 mm in diameter.