An array of 150 small concrete block structures was placed in Biscayne Bay, Florida, adjacent to a marina prior to its rehabilitation. A population of juvenile spiny lobsters, Panulirus argus, moved from the marina into the artificial structures before construction began in the
marina. The lobsters stayed in the structures for 14 months during construction. After construction, the structures were placed in the marina and the lobsters moved back into them. Weekly diver surveys and lobster tagging revealed seasonal population fluctuations of 316 to 2,854 lobsters in
the artificial structures, and that these lobsters were recruited into the Florida fishery from Key West to Lake Worth, a distance of 300 km. The artificial structures did not increase the lobster population in the bay, but provided a haven for lobsters during construction and effectively
replaced natural habitat lost as a result of marina construction. Post-larval recruitment appeared to be the major limiting factor for the lobster population in Biscayne Bay, not juvenile habitat.
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