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I am amazed. After decades of stocking, someone actually found a few gamefish residing in that aseptic swimming pool.
Your next mission is to find Bigfoot and take a picture with him.
North Jersey has a number of dead lakes. Some say it's the acidity (naturally occurring and exacerbated by acid rain). Others say it's the Copper naturally found in the rocks. I hiked out to a few lakes that have no road access expecting the lake to be overfilled with bass because the access was so difficult, only to find the lake completely barren of anything but tiny sunfish. An example of this would be Sunfish Pond in Worthington State Forest.

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