I’d say it’s likely there was some die off, but mostly the fish learn new behaviors relatively quickly. Before they were stocked they waited for food and learned to turn on when they spotted something as it was probably feeding time. But now they are constantly surrounded by midges and daphnia and whatever else so they begin to be more selective. Also it’s possible the following times were just one of those day that they shut off, whether it’s temperature, pressure, sunlight, whatever.
I’d be surprised if it was fished out already even if it is a pond in a town or city. But that isn’t impossible and would be kind of disconcerting.
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