1971 February: Loddon Weir. Fish Kill. Pesticide detected: Acrolein.

Herald – February 27 1971: MP Defends Killer of Weeds

“The Minister for Water Supply, Mr Dunstan, today defended the use of the weed killer Aqualin in irrigation channels…This month the Labor MLA for Kara Kara, Mr Curnow claimed that about 10,000 fish were killed when 24 gallons of Aqualin [were sprayed] into a 10 mile channel from Loddon Weir. Mr Dunstan agreed that Aqualin did kill some fish but it did not pollute the water…The weedicide is not used in rivers, but only in irrigation channels where any fish remaining in channels would die at the end of the season when the channels ran dry”