Overview
The Daggertooth (Anotopterus pharao) is a formidable and fearsome predatory teleost inhabiting the open pelagic expanses of global oceans. Belonging to the family Anotopteridae within the order Aulopiformes, this apex open-ocean hunter is famous for its long, spear-like silver body, complete absence of a dorsal fin, and cavernous jaws armed with colossal, dagger-like palatine teeth capable of slicing clean through the bodies of pelagic fishes and squid.
Biology and Physical Characteristics
Anotopterus pharao presents an ultra-slender, compressed, eel-like body that is completely devoid of true scales, glistening in radiant metallic silver with a dark bluish-black dorsal ridge. Unlike almost all other large pelagic fish, it lacks a dorsal fin entirely, possessing only a tiny adipose fin near its tail. Its head terminates in a long, pointed snout with huge binocular eyes; inside the mouth, its jaws house immense, backwards-pointing, razor-sharp triangular teeth rooted along the palatine bones that measure up to an inch in length, acting like a series of surgical scalpels to slash and immobilize fast-swimming prey.
Behavior and Ecology
Daggerteeth are swift, aggressive pursuit predators that cruise through mesopelagic and epipelagic waters, executing high-speed ambush attacks from beneath schooling fishes. In the subarctic North Pacific and North Atlantic, daggerteeth frequently slash adult migrating salmon, leaving behind iconic double slash wounds across salmon flanks that were historically a mystery to fisheries scientists. Reproduction is pelagic with larvae drifting in upper ocean currents before descending to deeper water as their predatory teeth erupt.
Conservation and Human Impact
The Daggertooth is evaluated as Least Concern by the IUCN due to its vast, circumglobal distribution in deep offshore waters. Because it does not school in dense numbers and lives far from coastlines, it is rarely caught by commercial fisheries, although it is occasionally landed as bycatch in pelagic driftnets and longlines. Its predatory role is an integral component of open-ocean trophic webs.
Interesting Factoid
The Daggertooth has no dorsal fin on its entire back, but its jaws are lined with razor-sharp dagger teeth that slash through swimming salmon with the speed of an underwater sword!
Last updated: October 2026