Overview
The Goliath Hagfish (Eptatretus goliath) is the largest species of hagfish on Earth, a primordial, eel-like chordate inhabiting the icy bathyal depths off the continental slopes of New Zealand. Reaching over four feet in length and weighing over ten pounds, this jawless marine leviathan represents an evolutionary lineage that has survived virtually unchanged for over 300 million years, serving as the deep ocean’s premier benthic recycling crew.
Biology and Physical Characteristics
Eptatretus goliath is a primitive craniate without a true vertebral column or jaw. Its elongated, muscular body is clothed in loose, scaleless purplish-gray skin. Its mouth is surrounded by sensitive sensory barbels and equipped with two pairs of horizontally moving, horn-like keratinous tooth plates that rasp meat from carcasses. Dominating its flanks are two lateral rows of specialized slime glands; when provoked, these glands instantly discharge coiled protein threads and mucin vesicles that expand ten-thousand-fold in seawater, producing liters of suffocating fibrous gel that chokes the gills of predatory sharks.
Behavior and Ecology
Operating as an essential abyssal scavenger, the goliath hagfish relies on its keen olfactory senses to track decaying carcasses falling from surface waters, such as whale falls and dead deep-sea fish. To exert leverage when tearing flesh without jaws, it ties its flexible, boneless body into an overhand knot and slides the knot down against the carcass, ripping off chunks of tissue. It can absorb nutrients directly across its skin and gills, and can survive for months between opportunistic feeding events in freezing bottom waters.
Conservation and Human Impact
Evaluated as Least Concern, Eptatretus goliath benefits from its remote, high-depth distribution across deep New Zealand trenches. While some commercial hagfish fisheries exist elsewhere in the Pacific for hagfish leather (eelskin) and meat, the goliath hagfish’s bathyal habitat provides natural insulation against heavy exploitation. Deep-sea bottom trawling remains the principal potential anthropogenic disturbance to its benthic muddy slopes.
Interesting Factoid
When attacked by a deep-sea shark, this giant hagfish shoots out specialized micro-fibers that turn the surrounding seawater into thick, suffocating jelly in less than a tenth of a second, leaving the shark gagging while the hagfish swims away unharmed!
Last updated: October 2026