The objective of the research study was to determine the effect of raw, mechanically separated (MSF) and washed flesh of roach added to yeast-based wheat dough on the shelf life and changes in quality occurring during the production and storage of products. The finger-shaped products contained MSF of roach added in the amount of 10 and 20 % of the weight of flour. The MSF of roach added impacted the sensory quality of fingers and their colour after baking that was measured by a reflection method; the roach in the form of washed MSF was a better raw material for producing flour-based snack products. It was found that, on the 9^th day of storage, the fragility of fingers decreased, their moisture content increased, and their overall sensory quality decreased regardless of the variant analyzed. As regards the overall sensory quality, the best fingers were those with 10 % of washed MSF added. The final fingers were characterized by a uniform shape and an even level of baking. The darkest were the products containing 20 % of the raw MSF added and the brightest those with 20 % of the washed MSF. The taste of fingers also depended on the fish flesh added: the samples with the raw MSF added were characterized by the most discernible fish flavour. It was proved that while storing the samples the amount of the primary and secondary lipid oxidation products continually increased, which was confirmed by the increase in the peroxide and anisidine values. Hydrolytic changes in fats were expressed using an acid value (AV). The fat fraction of the control sample was characterized by the lowest degree of hydrolysis and that of the sample with 20% of raw MSF added by the highest.