Weird Hactchetfish knows what you did last summer.

Hatchetfish according to Wikipedia:

Found most often at depths of 200-6000 meters in tropical and subtropical waters of the Atlantic, Pacific and Indian Oceans, marine hatchetfish grow from ca. 2.8 cm long in Polyipnus danae to ca. 2 feet long in giant hatchetfish (Argyropelecus gigas).

Unlike the freshwater varieties, marine hatchetfish are named for their laterally compressed and deeply keeled bodies, somewhat resembling a hatchet blade (with the caudal peduncle being the “handle”). Species of the genus Polyipnus are more rounded in outline. Their bodies are covered in delicate silvery scales which abrade easily. In some species, such as the highlight hatchetfish (Sternoptyx pseudobscura), large sections of the body at the base of the anal fin and/or caudal (tail) fin are transparent.

via darkroastedblend