It comes from long, skinny sea animals called hagfishes
I: Introduction, mollusks, crustaceans, hagfishes
, sharks, batoid fishes and chimaeras.
Notes on the habitat, aquarium maintenance, and experimental use of hagfishes
Physiological Specializations of Different Fish Groups: Hagfishes
and Lamprey Sturgeon Bony Fishes Air-Breathing Fishes Pelagic Fishes Fish Migrations Deep-Sea Fishes Intertidal Fishes
Thornyheads, YOY rockfishes, and hagfishes
had reaction rates <10% to either vehicle.
The researchers studied the way primitive fish, such as hagfishes
and lampreys, decompose to gain an impression of our early ancestry.