Since the Covid restrictions and working from home I’ve been doing a lot more running on the local trails. While running down by Middle Harbour river in the winter months some days the water boils and churns like there’s something very large thrashing about down there! It’s happened on many occasions but it’s only been once or twice that it’s been close enough to get a decent look at. The thrashing covers a patch of water approximately 3×3 meters and is usually close to the shore. It can stop and start over a period of a few minutes, each time lasts between 5 and 20 seconds.
I’ve still not been able to catch a glimpse of what is causing it but seeing the splashes from closer up it looks like it’s a school of large to medium fish rather than one large thing.
These are the only photos I’ve been able to get. They are taken from a long distance away. Now that it’s summer it’s stopped. I’ll try to get some better pictures next Winter