Ok Tedi Mining Limited (OTML) is conducting an environmental DNA (eDNA) study to monitor and track fish species in the Ok Tedi and Fly River systems.
eDNA is a technique used to identify species present in a given environment by analysing their genetic material. This material could come from shedded scales, body fluid or skin fragments.
“This genetic material floats in the water, where they can be collected by filtration of water samples and analysed in a specialised lab to reveal which species are present,” OTML superintendent riverine management Markson Yarrao said.
“The eDNA method can target one or multiple species, making it a versatile monitoring tool.”
The study, conducted in partnership with the James Cook University in Queensland, Australia, has been designed to track species across the entire Fly River system. eDNA sampling does not harm the fish, as only water samples are needed.
“This non-destructive approach is important given the river systems aquatic environment,” Yarrao said.
“Due to mining activity and impact to the Fly River system, many fish species have migrated from the main river to smaller creeks and tributaries in search of refuge. Understanding these changes is crucial for future conservation efforts and post-mine closure rehabilitation.”
To date, 33 fish tissue samples have been collected.
“The use of eDNA by OTML to monitor fish species in the Fly River system is first of its kind in Papua New Guinea,” Yarrao said.
“We are grateful to our OTML management for recognising the importance of the eDNA study and for their support in funding this exciting initiative.”
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