Good morning and Boker Tov
Fish in Hebrew is דג Dag
The Gematria of the word Dag is 7, for the letter Dalet ד has the value of 4 and the letter Gimmel has the value of 3, so together they make seven.
The fish that lives under the water symbolizes the hidden aspect of our lives. Traditionally, people eat fish on the evening of the seventh day (Friday evening), because in this way a triple connection is being made: 1) The fish which symbolizes the hidden aspect of lives, which is the soul, which is represented by the number seven, which is the gematria of the word fish in Hebrew Dag, 2) The seventh day that for which the soul was made for, and 3) The human spirit that the world was created for.
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