The Florida Keys have one of the worlds largest marine sanctuaries.

MARINE SANCTUARY FLORIDA KEYS
The Florida Keys and their environs have a long history (>100 years) of exploitation, thus many pressures on sanctuary resources are chronic, and to some degree cumulative. A historical perspective of sanctuary biodiversity suggests that the populations of many higher-trophic-level species, such as marine mammals and predatory fishes, were dramatically reduced by hunting and fishing prior to the sanctuary`s designation. Today, pressures on the resources include commercial and recreational fishing, disturbances to wildlife, coastal development, harmful algal blooms, marine debris, vessel groundings, the introduction of non-indigenous species, and vessel traffic. Human-driven factors such as climate change, sea level rise and ocean acidification are large-scale issues that may also affect sanctuary resources.
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