Just like the all seeing eye, it has been hijacked for different purposes over the centuries, the original Sumerian use is as follows, and as far as so called experts are aware, they were the first civilized society on this planet. https://harappa.com/script/parpola8.html

Biblical use of the fish symbol dates back to the Egyptians using said symbol, and the meaning of life 14 and all, 7 + 7 = 14, balance, male female and all that jazz, hence certain numbers being mentioned 14 times in the bible.