A Japanese entomologist has ventured from his area of expertise to delve into the taxonomy of these plastic fish and he has actually sorted them into distinct families and genera. You may wonder, why? Perhaps it is an ode to the humble soy sauce container, perhaps another outlet for a taxonomist to channel OCD, or perhaps just because.
The author of the book, Yoshihisa Sawada, is an expert in Japanese insect taxonomy and has worked at the Museum of Nature and Human Activities in Hyogo, having published several scientific papers in this field. He took his taxonomic expertise and applied it to an unlikely subject, seemingly below his expertise: plastic fish-shaped soy sauce bottles. He applies his same methodology and treats his subject with all the reverence and seriousness of an actual taxonomic study on living animals. The book was published in 2012 and, alas, is only available in Japanese. The rough translation of the title into English is “Soy sauce sea bream”. “Bream” refers to freshwater and marine fish from a variety of genera that are typically narrow and deep-bodied.