Unidentified eel-like creature (Lost in Space)

These unnamed eel-like creatures are native to the icy seas of the planet in which the survivors of the Resolute attack crash-landed.

Biology
They're described as methanogenic chordates, and metabolize hydrocarbons. Their blood is dark blue in coloration, and they seem to be both numerous and hostile.

History
Shortly after the incident, these creatures invaded the storage units of most of the crashed ships and started to feed on the methane-based fuel, which was speculated to be chemically similar to their native food source.

Appearances

 * Netflix's Lost in Space
 * s01e03, "Infestation" (2018)
 * s01e04, "The Robinsons Were Here" (2018)