This photo is the auction of mango from Miyazaki prefecture.
Regarding Ota market, let me explain what I learned there.
This is like Tsukiji of Vegetable. You know what I mean ?
Yes, this is the biggest vegetable(and fruit) market. Their flower market is also the biggest in Japan. Ota market has some fish market also, but the scale is rather small. ( 3 veggie wings, 1 fish wing and 1 flower wing. Plus, there is a hotel, sports club, office building, fridges for products etc. on the premises. )
Basically the market is open for 24 hours. During night, the products arrive, from 2:00 a.m. the preparation begins , around 5:00 a.m. the auction starts, after the morning auction, he products will be shipped out, then cleaning and the comunication time with origins of the products. Next time when I shop at Ozeki, Peacock store , Daiei or local small shops, I will remember Ota market where the veggies and fruits were shipped from.
There are 11 wholesale markets in Tokyo including this Ota market and Tsukiji known for fish.
Others are Yodobashi, Tama New Town, Setagaya, Shokuniku ( in Konan, Minato-Ku), Itabashi, Toshima, Kita-Adachi, Adachi and Kasai.