What? By Oglaf? And it’s entirely safe for work? Yep.
You don’t get to postulate a globe-spanning catastrophic flood that demolishes everything on the land and simply assume that fish will be unaffected. Every aquarist knows fish are profoundly affected by things like salinity, pH, elements like phosphates, etc. We don’t usually have to worry about violent churning and silt, fortunately, but in Noah’s flood you would.
I hadn’t thought about the potatoes, and most plants, in fact, but they also wouldn’t tolerate the massive disruption caused by the Christian magic flood story.
Of course, if you accept the metaphor, myth, and poetry theory, all the problems go away.