Bull and pigeye sharks are relatively common, but little is known about them in NT waters.
The speartooth and northern river sharks are listed as critically endangered, although their true numbers are unknown.
What is known is that they have been found in rivers and open water along the NT coastline, and the two species and bull sharks are similar in appearance.
Small specimens around 60 - 80cm are found in brackish waters in the upper reaches of tidal rivers but larger ones to 3m live in estuaries and coastal regions.
How to identify northern river sharks
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Matt Flynn
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How to identify northern river sharks
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