So, our colonists of the oceanic planet Mayim (yes, that's its name), of whom every single one is a Jew, have encountered a problem: there is no more room on the buoyant-colony-thing that they live in, and they can't get back to Earth (the warp-gate broke).
Then the scientists have a great idea: their children shall become fish!
Seriously, gene modification so that everyone becomes parent to a blue fish mermaid/man, fins and everything. Mandatory for all. Is this morally wrong?
Important note: this is important for the to-be-born colonists' survival.
Another note: This isn't gene-splicing so much as going into the coding directly and messing around.