Abstract: According to the present invention, a method for recovering useful fish meat proteins from waste water generated during fish paste or fishmeal production is provided. The provided is a method for recovering water-soluble proteins from fish paste leaching waste water or stick water, comprising: adjusting the pH of fish paste leaching waste water or stick water to 4.5-5.5 to insolubilize water-soluble proteins; heating the insolubilized proteins to 30° C. to 90° C. to cause the proteins to flocculate so as to form flocs; subjecting the flocs to solid-liquid separation using a decanter centrifuge during heating; and recovering proteins in the form of solid content.

Abstract: According to the present invention, a method for recovering useful fish meat proteins from waste water generated during fish paste or fishmeal production is provided. The provided is a method for recovering water-soluble proteins from fish paste leaching waste water or stick water, comprising: adjusting the pH of fish paste leaching waste water or stick water to 4.5-5.5 to insolubilize water-soluble proteins; heating the insolubilized proteins to 30° C. to 90° C. to cause the proteins to flocculate so as to form flocs; subjecting the flocs to solid-liquid separation using a decanter centrifuge during heating; and recovering proteins in the form of solid content.

Abstract: The invention provides a method that enables stable production of frozen minced fish meat that is excellent in frozen-state storage stability and is less likely to suffer from decreased gel-forming ability during frozen storage in a practical and productive manner, even when a fish meat raw material contaminated by visceral organs is used. Such method can be applied to the industrial production of minced fish meat. The invention also provides frozen minced fish meat produced by such method. Production of minced fish meat using a fish meat raw material contaminated by visceral organs, and, in particular, the kidneys, which are difficult to remove in the process of production, comprises adding sugar and sugar alcohol, a polymer phosphate, and a non-chelating basic additive other than a polymer phosphate and adjusting the pH level of the minced fish meat to 7.5 or higher using the polymer phosphate and the non-chelating basic additive other than a polymer phosphate.