"The last day of the season, if the park gets picked clean and isn't stocked"
Catch and release does work.
I'm talking about the last day of the season here. As in, if the last day of the catch and keep season there are no fish left in the stream, then the C&R season will have no fish unless there is a stocking.
If you're familiar with the park, especially in recent years, there isn't a lot of hold over fish from day to day -- especially if the park gets a big crowd. Contrast this with Montauk where there are a lot of hold over fish in the stream and C&R without a stocking would still be pretty fun.