Think back over a month ago or even more. I have found that our perch do not float up after dieing for a good month. Most dead perch you don't see they go straight to the bottom. As the water gets mixed or warms up they will float up. What you are seeing could have been dead from the winter or ice over.

When I see that red at the base of the nose and fins its in larger fish that have been on the line for a long time fighting. I would bet those fish died of low O2.

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7/8th of an acre, Perch only pond, Ontario, Canada.