sentences:  Because cormorant fishing is part of the Imperial Household, the Nagara River has become a protected river, which keeps it clean and healthy, allowing cormorant fishing to continue through the ages.The birds have become such a part of Japanese lore, that they have given rise to the expression "unomi" (鵜呑み), which means to “swallow whole like a cormorant” or “accept without questions,” because they can swallow fish whole without choking on the scales.As the techniques improved and enough fish were caught, it turned into an industry.