The traditional church layout is of a cross pointing to the East, being the birth place of Christianity. Should the Jesus fish follow suit?
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The Christian fish symbol or 'Jesus Fish' is conventionally shown swimming from right to left. And there are two likely reasons for this:
Christ overcomes evil with love. He comes from righteousness (symbolised by the right side) to confront evil (symbolised by the left side).
If a 'Jesus Fish' faces the opposite way (left to right) this is not 'wrong' or sacrilegious; it simply symbolises the complementary analogy of Christ carrying us from the left, evil side of life, to righteousness on the right-hand side of God. (Similarly in Western Christianity when signing the cross, the fingers trace a line from the left shoulder to the right shoulder.)
In other words, the direction is related to the right side's connection with righteousness. (See also Why is right, right?)
When any text in added to the symbol, for example 'Jesus' or 'ΙΧΘΥΣ', aesthetically it looks better to have the first letter of in the mouth of the fish rather than its tail.
But the direction doesn't matter a hoot in comparison to the meaning of the symbol. (See Christian fish symbol.)