The ostracod is a tiny organism that emits a bio-luminescent chemical when eaten by a fish to make the fish visible to predators, which is why the fish in this gif immediately spits it out.The ostracod is a tiny organism that emits a bio-luminescent chemical when eaten by a fish to make the fish visible to predators, which is why the fish in the gif below immediately spits it out.
Here's what an Ostracod looks like..
Wow cool interesting creatures, upvoted.