Overview
The Narrow Sawfish (Anoxypristis cuspidata), also known as the pointed sawfish or knifetooth sawfish, is a magnificent elasmobranch uniquely positioned as the sole living member of its genus within the sawfish family (Pristidae). Distinguished from other sawfishes by its exceptionally narrow, dagger-shaped rostrum lined with sharp, thorn-like teeth beginning only on the distal half, this predatory ray cruises the shallow estuarine and coastal waters of the Indo-West Pacific with effortless grace.
Biology and Physical Characteristics
Sporting a shark-like hydrodynamic body with broad pectoral wings and two tall dorsal fins, the narrow sawfish is colored in slate-gray to pale greenish-brown above with a clean white ventral surface. Its standout feature is its rostral blade, which lacks rostral teeth along its basal third. The rostrum is densely packed with electroreceptive ampullae of Lorenzini that detect faint electrical impulses emitted by prey concealed beneath benthic sands. Once prey is pinpointed, the sawfish slashes its toothed saw sideways with immense speed and force, impaling or stunning swimming fish and unearthing buried crustaceans.
Behavior and Ecology
Narrow sawfish are bentho-pelagic predators that spend more time swimming freely in the water column than their strictly bottom-dwelling kin. While primarily marine and estuarine, they occasionally penetrate lower freshwater river reaches during high-tide cycles. Reproduction is aplacental viviparous (ovoviviparous), where developing embryos obtain nourishment from yolk sacs before mothers give birth to litters of six to twenty pups. To prevent injuring the mother during parturition, the pups’ rostral teeth are encased in a protective sheath of gelatinous tissue that dissolves shortly after birth.
Conservation and Human Impact
Across vast swathes of Southeast Asia and the Indian subcontinent, narrow sawfish have suffered severe population collapses. Their toothed rostral saws make them exceptionally susceptible to entanglement in commercial gillnets and prawn trawls. Furthermore, coastal mangrove loss and targeted poaching for their prized fins (shark fin trade) and rostrums (sold as curios) have drastically reduced numbers. Today, northern Australia remains the species’ primary remaining stronghold, safeguarded by strict fisheries legislation and marine protected zones.
Interesting Factoid
Unlike other sawfishes whose rostral teeth are rooted deeply in calcified sockets, the sharp, knife-like teeth of the narrow sawfish are flattened, blade-like, and set superficially into the margin of the rostral cartilage.
Last updated: October 2026