Actually interested to see how they would fare elsewhere in the world. What exactly is the Jamaican climate like?
Think south Florida but vaguely warmer & temperature spikes are buffered by the sea. IE: toasty, but not roasting... unless it's really still. Maybe think of Bali, as they've got that cold-water current. Silvers are regular imports & do fine in unheated tanks &/or ponds, though as Amazonians they're likely tolerant. Iridescent sharks also do well in ponds, which may be a better example re. temperature & size. Clown loaches (Burmese) slow down over those very coldest nights, but are otherwise fine.
Specifics: down by the coast the coldest would be 22C in the worst winter storm (normally not less than 27 these days) & a reasonably continuous 36C-ish through the summer. In the hills it's appreciably cooler if that's necessary - I'm at 1600' and 14C in coldest of winter, rarely above 32 in depths of summer. Could run the whole thing on rainwater in several places, or tag to a river if hardness of spring-water is an issue.
Issues would be similar to those of tilapia & basa aquaculture, including high fuel/electricity costs & theft (for the dinner-table), as may be mitigated thorough programmatic design & location as quantities/areas would be small relative to food-production. Also osprey & heron (spp various); osprey tend to be seasonal. Crocodile, too, which might be lumped under "theft prevention" with fencing/security, maybe a loudmouth Caribbean Terrier (AKA semi-feral brown-dog) or twelve - also good for shore/wading birds. You'd need back-up generators & hurricane insurance.
Silvers are regularly imported, a load of Jardini came in maybe 10yrs ago and CITES permits are (usually) a matter of paperwork, particularly captive-bred animals that would be coming through London, Germany or Toronto.
Awaiting billionaire investor