Fish nocturnal

Green Sawfish

Pristis zijsron

A prehistoric titan of the estuaries, the Green Sawfish is easily recognized by its massive, tooth-lined rostrum. Though critically endangered, this ghost of the mangroves remains one of the most awe-inspiring predators in the Indo-West Pacific.

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Quick Identification

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Size

A massive species reaching up to 7.3 meters (24 feet) in length and weighing over 600 kg (1,320 lbs).

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Colors

Dorsal surface is olive-green, yellowish-brown, or grey; ventral side (belly) is white or pale cream.

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Key Features

Extraordinarily long rostrum with 23–34 pairs of evenly spaced teeth
First dorsal fin originates well behind the start of the pelvic fins
Lower lobe of the tail fin is very small or absent
Shark-like body with flattened underside

When You’ll See Them

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Activity pattern nocturnal

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Peak hours 9 PM - 5 AM

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Season Year-round (sightings often increase during the wet season in tropical regions)

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Diet A generalist predator that eats small schooling fish (like mullet and herring), squid, and bottom-dwelling crustaceans including crabs and prawns.

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Habitat Shallow coastal waters, tropical estuaries, mangrove systems, and occasionally the lower reaches of freshwater rivers.

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Behavior

The Green Sawfish is a master of the murky transition zones where rivers meet the sea. Despite their intimidating appearance, they are relatively shy and spend much of their day resting on the sandy or muddy bottom. They are primarily nocturnal hunters, becoming significantly more active as the sun sets. Their most famous tool, the 'saw' or rostrum, is actually a highly sensitive sensory organ packed with electro-receptors that allow them to detect the heartbeat and movement of prey in zero-visibility water.

When hunting, the Green Sawfish swims through schools of fish, thrashing its saw from side to side to impale or stun its prey. They are also known to use the rostrum to dig through the substrate for buried crustaceans. While they are usually solitary, they may congregate in nutrient-rich estuaries during specific times of the year. Human encounters are rare due to their declining numbers and preference for turbid water, but they are highly respected by coastal communities for their size and power.

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Camera Tips

Capturing a Green Sawfish on camera requires specialized underwater equipment, as these are marine and estuarine animals. If your 'backyard' is a saltwater canal or a mangrove-lined property in Northern Australia or the Indo-Pacific, you have a unique opportunity. For the best results, use a submersible trail camera or an ROV (Remotely Operated Vehicle) with AI detection capabilities. Place your camera at the edge of a deep channel or near submerged mangrove roots where sawfish are likely to cruise during a rising tide.

Because the Green Sawfish is a nocturnal hunter, your camera must have high-quality infrared (IR) or low-glow LEDs. Traditional white light can startle them and cause them to flee. Angle the camera slightly upward from the seafloor or mount it to a pier pylon about 1-2 feet above the substrate. This position increases your chances of capturing the silhouette of the rostrum and the specific placement of the dorsal fins, which are critical for species identification.

Baiting is an effective way to draw a Green Sawfish into the camera's field of view. Use a perforated bait box filled with oily fish like mackerel or sardines; the scent will travel through the current and lure the sawfish to investigate. Ensure the bait box is securely anchored, as a sawfish may use its rostrum to investigate the source of the smell. Set your camera to record video bursts of at least 30 seconds, as sawfish movements can be slow and methodical until they strike.

Check your local tide charts and set your equipment to be most active during the incoming tide at night. This is when Green Sawfish typically move into shallow flats to feed. Given their status as a critically endangered species, always prioritize non-invasive observation. If your AI camera triggers a 'Sawfish' alert, ensure the location data is shared with local conservation groups or marine biologists to assist in their recovery efforts.

Similar Species

Species that look similar or are commonly confused with Green Sawfish.

Largetooth Sawfish

The first dorsal fin is located well in front of the pelvic fins, and it has fewer rostrum teeth (14–24 pairs).

Narrow Sawfish

Much smaller with a significantly narrower rostrum that lacks teeth on the basal third of its length.

Frequently Asked Questions

Green Sawfish are primarily nocturnal, meaning they are most active during the night. They typically hunt in the hours between dusk and dawn, using their electro-receptive rostrum to find prey in the dark or in murky estuarine waters.

If you live in a coastal area where they reside, you can attract them using oily fish bait (like sardines) placed in a secure underwater bait box. Position the camera near tidal channels or mangrove roots during a rising tide at night for the best results.

Their diet consists of small schooling fish and bottom-dwelling invertebrates. They use their saw to stun fish in open water or to rake the mud and sand to uncover shrimp and crabs.

They are extremely rare and critically endangered. However, they can still be found in suburban canal systems or coastal areas in parts of Northern Australia and Southeast Asia that border mangrove habitats.

The easiest way to distinguish them is by looking at the fins. In the Green Sawfish, the first dorsal fin starts well behind the pelvic fins. In the Largetooth Sawfish, the first dorsal fin is positioned significantly further forward, usually well in front of the pelvic fins.

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