BLUEFIELDS BAY, Jamaica - YOUNG fish leap in the wake of a warden’s patrol boat as it motors through waters off Jamaica’s southwest coast that are a brilliant palette of blues. Beneath the surface, reefs bristle with spiny lobsters, and rainbowcoloured parrotfish graze on algae and seaweed. After rampant destruction of local fish habitats over decades, marine life is gradually rebounding in Bluefields Bay now that every minnow and mullet, each sea urchin and snapper is protected from spear guns and nets. This 6 1/2-mile (10- kilometre) long stretch of water, patrolled daily by a small team of wardens and marine police, is one of a growing number of no-fishing zones in the Caribbean, where most coastal reefs have been severely damaged by overfishing, pollution, and more recently global warming.