Cut off the blue fish

...During the abstinence periods for childbirth impurity, death impurity, and blood impurity, there are restrictions such as not being exposed to sunlight, not eating or cooking with others, and there are also strict food taboos for pregnant and new mothers. In Kitaazumi District, Nagano Prefecture, a village-wide abstinence is called "abstinence from greens," and in some villages, no vegetables are eaten on June 1st. In the case of making a prayer, when making a heartfelt wish for recovery from an illness or the like, people abstain from luxury items and food, showing their earnest devotion to the object of their prayers....

*Some of the terminology that refers to "cutting off bluefish" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…産穢，死穢，血穢の物忌中には，太陽の光にあたらない，他人と食事や火をともにしない，といった規制があり，妊婦･産婦への食物禁忌も強い。全村的な謹慎は，長野県北安曇郡で〈青物断ち〉といい，6月1日は野菜を食べない村がある。立願の場合は，病気回復など切実な心願を掛けるとき，祈願対象に帰依心の切実さを示して，嗜好品や食料を断つ。…

※「青物断ち」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報