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It's that time of year again when the Macquarie Perch enjoy the warmer waters and start their spawning cycle. Each year between October and December, when water temperatures exceed 16°C, the Macquarie Perch lay their eggs in riffles and runs of rocky streams. The eggs then drift downstream and lodge amongst the cobble and will stay there until they hatch 10-11 days later. http://www.gbcma.vic.gov.au/news_events/macquarie-perch-enjoy-warm-waters.html