Dr Wueringer holds the head of the saw-less freshwater sawfish (Pristis pristis).  The saw was likely amputated by a fisher who took it as a trophy. Internationally, the trade of sawfish body parts is protected under CITES, which also protects for example the ivory of elephants. 

Dr Wueringer with the sawfish. 

The brain of the sawfish sits between the eyes and spiracles (the first gill slit which is located just behind the eyes). Amputating the sawfishes’ saw creates an opening in the braincase to the environment. The procedure likely kills most sawfish.  

The sawless freshwater sawfish was female and measured 2m 10 cm in length. Females of this species reach sexual maturity in Queensland waters at around 2.4 – 3m total length (including the saw), which equates to about 8-10 years of age. This female is unlikely to produce, as she is very emaciated, indicating that she cannot feed without the saw. 

After measuring, tagging, and DNA sampling, the female sawfish is quickly released and swims away. She then rests in the shallows of a sidearm of the Mitchell River. The yellow dart tag is visible right below the first dorsal fin. 

One of the measurements that the scientists take is the width of the base of the saw. 

This juvenile freshwater sawfish was likely born this year. On the underside of its head its nostrils and jaws are visible.