"まな板の上の鯉" - a koi (carp) on the cutting board which is used to describe when situations are doomed. this is best used to describe tsukiji fish market - the disneyland for pescetarians.
koi is a symbol of luck, prosperity and good fortune in japanese (also chinese and those weird aquarists) cultures. despite various efforts in the forms of delays and protests, the market was doomed to end its 80+ years of history and was closed yesterday on 6th Oct 2018.
koi is seldom consumed as food in japan, the idiom itself is also a red herring (pun alert). likewise the move of the fish market from tsukiji to toyosu seemed to have a motive that deeper than the commonly quoted ones - 2020 olympics, ageing facilities, prime real estate and the increasing hordes of pesky visitors (including me).
i don't understand the move of the market for olympics though. lets destroy a century worth of history by moving 2km east for an event that lasts 3 weeks - surely that wouldn't make a lot sense, right? it gets more bizarre, like japanese anime, the latest plan was to convert the vacated site into a temporary parking site during the olympics. come on, at least hold the inaugural olympics competitive hotdog eating here. don't google, i made that event up.
despite my affection for this wonderland, it is not my place as a gaijin to be critical or nostalgic of the move. at least, i was fortunate enough that i was able to make a final trip and witness its last month of operations.