Editing Fish (section)

==== Complete Integration of Fish in the Sea ====
There is an additional explanation in Chassidus regarding fish, which is the aspect of Hashem Echad (G-d is One), which is the drawing down of Daas Elyon whose concept is yichuda ila'ah, which is also called "sea" - as the entirety of the sea is one existence in which everything exists and is included and is not separate from it. Therefore fish do not create a chatzitzah (separation) in a mikvah and are counted in the forty se'ah measure.

This explanation is brought regarding Rav Hamnuna Saba's neshamah being a neshamah of Atzilus from the aspect of neshamos of the supernal sea in Malchus of Atzilus, and therefore he was called Rav Hamnuna from the term "nunei yama". The Rebbe Maharash explains that just as fish in the sea are absorbed in the sea water and the water permeates within them completely such that they are like the essence of the water itself, so too the neshamos of Atzilus like the neshamah of Rav Hamnuna Saba are in a state of complete bitul, to the point that they cannot separate even for one hour, as part of the water itself (in the mashal of the fish), and as our Sages say "a fetus is like its mother's limb", meaning: despite being a fetus with its own distinct existence, nevertheless during the entire pregnancy it is like its mother's limb and is not considered a separate entity, due to its complete bitul to its mother during this time - eating what the mother eats and drinking what the mother drinks etc. Similarly, the neshamos of Atzilus while in the womb of Malchus called Yam Suf are like their mother's limb and completely nullified like a fetus which is its mother's limb and like fish in the sea that are absorbed in the sea water.