where i found it, someone said that it is the larval stage of a /b/tard, which is... apt, but not the answer i'm looking for.
edit never mind, we have us an answer - it's a lumpfish.
"Perhaps one of the most interesting facts about the Lumpfish is the male's devotion to the eggs before they hatch. While the male waits for the eggs to hatch, he fasts so that he can stay close to the eggs. The male also fans the egg mass constantly with his lumpy fin. (The female has since moved on.) When at last the eggs hatch, the male is so thin and exhausted he cannot continue on with the babies and they swim off on their own."