Influence. Pour the coarse grain self-made nest material in the old jar into the softened rapeseed cake and mix with it. Finally, the container is sealed and stored for fermentation, and it can be used in about 7 days. Because of the multi-purpose flavor of the additive, the fermented rapeseed cake is sour, sweet and delicious, slightly alcoholic, and has a good effect on crucian carp, carp and grass carp. Therefore, adding rapeseed cake will affect fermentation.