Here's another weird and wonderful denzien of the oceans for you to to look at: Rhinochimaeridae, or the Long-Nosed Chimera fish. In South Africa, it is also known as the Ghost Shark.
This fishy lives from 200 to over 2,000 meters below sea-level, nearly 8,000 feet down in the abyss. The long nose has many sensory endings used to locate small fish for it to eat.
It also has a poisonous spike protruding from the first dorsal fin, which is mildly toxic and thought to be for defence purposes.
Very little seems to be known about these odd fish, but here is a link to a scientific paper which gives info about all of the Chimera order.