Anyone Keep Native Saltwater?

There are threads occasionally on the big reef site of people doing this with stuff they collect locally, problem is how cold they need to be kept. Massive chillers and insulation to get the tanks into the 50's for the winter without it sweating all over the place.

If you look on the native forum of this site, there is a post above Marine natives

I've kept a checkerd pufferfish I caught on a fishing pole and a toadfish I caught with a net. They lived for about a year. They were cooler than they would of been if I had bought them because I caught them myself.

As I kid growing up on Kauai, we had no pet store for many years(I mean we had a pet store but it closed for 4-5 years, the days before the internet). For freshwater we had available introduced livebearers(swords, guppies and Gambusia), dojo loachs, goldfish(could be found in the Wailua river), tilapia, peacock bass, LNB/SMB Chinese catfish and occasionally you could find a channel cat in the streams/reservoirs that we would collect. For saltwater, the possibilities were greater, too many species to mention. I put together a Hawaiian tidal pool biotope that was pretty cool. So native saltwater but not native to N. America

Obviously not a big problem in SoCal, but would you say that saltwater ponds generally need covers as not to allow too much rain in, oddball?

I know a guy in south Jersey that has kept silversides, killies, spot, croaker, blowfish, flounder, american eel, juvi striper, perch and a few others I forget that he cast nets in his lagoon.