When did the word fish become a horizontal character with four divisions of water?

In some fonts, the four points at the bottom of the fish are really simplified as a horizontal line, which is for the convenience of writing and the need of font specification. In the evolution of Chinese characters, strokes in some fonts are simplified and standardized to speed up writing and improve font recognition ability.

In the simplification of the fish character, the four points at the bottom are simplified as a horizontal line, which is to maintain the overall structure and unity of the font. In the field of calligraphy, this simplification will not affect the essential meaning of the word fish.

It should be noted that different fonts and writing methods may be different, so there may be some differences in actual use.