A method for obtaining dehydrated food with high protein content and high bioavailability, produced from fish stickwater; the characteristics of the method include the following steps: a. To provide a quantity of stickwater, b. To separate stickwater from insoluble solids and fat traces by means of a separation equipment that may be a Sedicanter or disk centrifuge operating at a speed of 3000 to 6000 xg for 5 minutes, c. To remove salt from the previously refined stickwater with an electrodialysis equipment; wherein the stickwater with salt reaches the active area of the electrodialysis equipment membranes; wherein the DC voltage is applied until the positively charged cation, Na+, to migrate toward the cathode, while the anion, CI-, goes to the anode system; when any of these ions reaches the ion exchange membranes, the properties of the membranes will determine whether the ion is rejected or accepted through them; the ions that can pass through the membranes are retained in the next compartment, since the next membrane has the opposite charge; wherein the stickwater flow that runs through a circuit is demineralized until reducing the conductivity, and at the same time another water flow or weak brine, in another circuit, keeps accumulating itself, until forming a concentrated brine of high electrical conductivity, d. To hydrolyze the demineralized stickwater. For this purpose, the stickwater is pumped to an equalizer tank, where the temperature is adjusted to 60 °C and pH of 7.5-9 with the addition of NaOH. Under these conditions, stickwater is subjected to an evaporation process in an evaporator plant - which may be a falling film, vacuum evaporators or other means of evaporation -, adding at the beginning of this process and continuously an alkaline protease, endopeptidase, of bacterial origin, Bacillus licheniformis, in a proportion of 1% with respect to the protein content of stickwater, in order to hydrolyze the peptide bonds inside the protein molecules. The evaporation process - which takes 30 to 60 minutes depending on the type of evaporator plant used - ends when the concentrate reaches 40 to 45% of solids, with a hydrolysis level of 18 - 20%, and is then subjected to a final heating process of 85 °C for 15 minutes to inactivate the enzyme, e. To temporarily store the hydrolyzed concentrate in a buffer tank to be subsequently pumped into a "spray dryer", allowing the dehydration of the product until it achieves a solids content from 90 to 95% and a moisture content between 3 and 5%, having 92% of protein with molecular weights below 1000 daltons and a digestibility degree greater than 98%, f. To package the hydrolyzed concentrate in flexible bags made of a moisture-resistant barrier, in order to avoid the rehydration of the product. a. To provide a quantity of stickwater, b. To separate stickwater from insoluble solids and fat traces by means of a separation equipment that may be a Sedicanter or disk centrifuge operating at a speed of 3000 to 6000 xg for 5 minutes, c. To remove salt from the previously refined stickwater with an electrodialysis equipment; wherein the stickwater with salt reaches the active area of the electrodialysis equipment membranes; wherein the DC voltage is applied until the positively charged cation, Na+, to migrate toward the cathode, while the anion, CI-, goes to the anode system; when any of these ions reaches the ion exchange membranes, the properties of the membranes will determine whether the ion is rejected or accepted through them; the ions that can pass through the membranes are retained in the next compartment, since the next membrane has the opposite charge; wherein the stickwater flow that runs through a circuit is demineralized until reducing the conductivity, and at the same time another water flow or weak brine, in another circuit, keeps accumulating itself, until forming a concentrated brine of high electrical conductivity, d. To hydrolyze the demineralized stickwater. For this purpose, the stickwater is pumped to an equalizer tank, where the temperature is adjusted to 60 °C and pH of 7.5-9 with the addition of NaOH. Under these conditions, stickwater is subjected to an evaporation process in an evaporator plant - which may be a falling film, vacuum evaporators or other means of evaporation -, adding at the beginning of this process and continuously an alkaline protease, endopeptidase, of bacterial origin, Bacillus licheniformis, in a proportion of 1% with respect to the protein content of stickwater, in order to hydrolyze the peptide bonds inside the protein molecules. The evaporation process - which takes 30 to 60 minutes depending on the type of evaporator plant used - ends when the concentrate reaches 40 to 45% of solids, with a hydrolysis level of 18 - 20%, and is then subjected to a final heating process of 85 °C for 15 minutes to inactivate the enzyme, e. To temporarily store the hydrolyzed concentrate in a buffer tank to be subsequently pumped into a "spray dryer", allowing the dehydration of the product until it achieves a solids content from 90 to 95% and a moisture content between 3 and 5%, having 92% of protein with molecular weights below 1000 daltons and a digestibility degree greater than 98%, f. To package the hydrolyzed concentrate in flexible bags made of a moisture-resistant barrier, in order to avoid the rehydration of the product.