The series follows life on "the vast Bering Sea" aboard various crab fishing boats during two of the crab fishing seasons, the October king crab season and the January opilio crab (C. opilio; often referred to as "snow crab" or "opies") season. The show emphasizes the dangers on deck to the fishermen (and the Discovery Channel camera crews recording their work) as crews duck heavy crab pots swinging into position, maneuver hundreds of pounds of crab across a deck strewn with hazards (i.e., holding tank hatches, uneven surfaces, maintenance access plates, wet decks), and lean over the rails to position pots for launch or retrieval as galeforce winds and high waves constantly lash the deck. The series also documents the dangers of being on a boat in the Bering Sea, in the midst of some of the coldest and stormiest waters on earth, where even a minor problem may become complex or even catastrophic with the nearest port often hundreds of miles away.

Based on this passage, what kind of crab are caught on deadliest catch? Let's think fast. Stream of consciousness:
To answer this question, we should know that: The series follows life on "the vast Bering Sea" aboard various crab fishing boats during two of the crab fishing seasons, the October king crab season and the January opilio crab (C. opilio; often referred to as "snow crab" or "opies") season. So the final answer is king crab.