Nice folks
I've long regarded the Darwin Fish largely as a symbol of derision toward religion. Even before I became a Christian, I regarded the hijacking of an explicitly religious symbol as an act of spiritual hostility.
It appears I may have been correct:
It is my way of saying, "Creationists are [expletive] idiots. Get a [expletive] education. Humans are no better than chickens, redwoods, fireflies, earthworms, goldfish, algae or infectious salmonella, just because we walk upright and have opposable thumbs."
Nice fella. Of course, he's talking about creationists here, but the article lends much support to my original impression. Recommended reading.
Link via The Volokh Conspiracy