Chuo Gyorui is a specialized trading company handling about 500 categories and 2,000 items of seafood varying from premium fish such as tuna,globefish,and uni(sea urchin roe),to popular fish such as horse mackerel and mackerel pike and processed products such as kamaboko(fish cakes)and chikuwa(fish sticks).
Naturally,each type of product has different suppliers and buyers coupled with varying supply and demand.
This explains why Chuo Gyorui has many different divisions, each of which is specialized in handling the kaleidoscope of possible permutations and choices.