Some people think fish losses at water diversions is a new problem. History tells us it’s been happening for decades.
By Craig Boys and Tom Rayner
Newspaper articles, from as early as the 1920s, reported cod, perch and blackfish being diverted into irrigation canals along the Murray River. One local said,
“by opening the sluice gates many small fry are left on the land, and when the water flows back they die in thousands”.
A NSW Inland Fisheries Officer investigated, recommending the “installation of screens at all irrigation and other pumping plants” (Register News-Pictorial 1929).
A string of articles in 1946 and 1947 discussed the need to address the significant numbers of Murray cod and other native fish being lost to Murrumbidgee Irrigation canals.
These articles highlight that fishers have long been engaged in the discussion, labelling the losses of “immense quantities of valuable fish” as “deplorable”.
Read more in Boys et al. (2021). Native fish losses due to water extraction in Australian rivers: Evidence, impacts and a solution in modern fish- and farm-friendly screens. Ecological Management and Restoration.
Little has changed in terms of fish entrainment.
In 2003, NSW Fisheries rescued over 300 adult golden perch and smaller numbers of silver perch from a a large off-channel storage near Bourke.
More recently, a the Victorian Fisheries Authority rescued fish from irrigation channels off the Murray River that were being dewatered for maintenance. They saved 1,207 Murray cod, 143 golden perch, 199 river blackfish and one silver perch.
The Fish Screens Australia website was built to highlight these issues by providing good information on the state of modern screening and how it fits into agriculture and conservation. if you’re farming on the Murray River, or just generally want to find out more, the screens page provides an overview of the different types of screens that are available. These can be adapted or combined to screen any type of diversion. Visit the showcase sites page to see how the modern pump screens are saving farmers thousands in maintenance and helping our native fish populations get back on their feet.