Are people allowed to fish at the Botanical Gardens

Yes

It is catch and throw back

No.

Yes. There's a sign at the pond, it's catch and release only

Yes, the lake is catch and release, the St. Lucie River is the botanical garden's west border and you can fish and keep anything you catch.

I believe so, but it is catch and release.

When you turn into the garden you can drive or walk off to the left side back towards the river to fish but not in the actual garden.