Appearance and lifestyle:
Although they look like snakes, hagfish (Eptatretus stoutii) are not snakes or eels, but belong to a unique group of animals. They are primitive animals that have no jaws, no eyes, fins or scales. They have a cartilaginous skeleton and pouch-like gills not seen in any other living fish. Living fossils, the species have changed little since the days of the earliest hagfish, which date back some 330 million years.
Cursed by lobster fishermen for the quantities of slime they produce when startled, these oceanic oozers secrete a white fluid which expands rapidly on contact with seawater, producing enough slime to fill a 7-litre bucket in minutes. The sticky substance adheres to predators, forming a suffocating layer over their gills. The slime also creates problems for the hagfish itself, but it has developed a manoeuvre which allows it to escape – it knots its tail and, twisting the knot over its body, scrapes off the offending slime.
Habitat:
Hagfish are found deep down in the ocean near the ocean floor.
Diet:
Since they have no teeth hagfish cannot eat scaly fish and therefore they only feed on small live fish, on soft rotting carcasses or on animals that other animals have already opened. When larger food items are found, such as dead whales, hagfish have another strategy – they enter the giant corpse and eat the soft tissue out from within.
Threats:
Hagfish are harvested in some areas for leather, and they are at risk of being fishing bycatch.