Coral reef fishing and coral-algal phase shifts:: implications for global reef status

Coral reef fisheries support lens of millions of people, mostly in developing countries. Fishing on reefs can be classified into three stages: manageable, ecosystem-overfished, and Malthusian-overfished. Fishing with blasting devices and poisons is often associated with the third stage. Reductions in herbivory caused by overfishing may enhance the likelihood of organic pollution causing a coral-algal phase shift following major disturbances. However, cage studies indicate that reduction in herbivory can lead to the proliferation of algae even in the absence of eutrophication. A major concern with the widespread coral bleaching associated with the 1997-1998 El Nino event is the likelihood that reefs already stressed by overfishing and organic pollution may not return to coral dominance after severe bleaching. Clues Co levels of fishing and to the potential to recover from disturbances include changes in the de-vegetated haloes around coral stands on reef flats and the differing spectral signatures of live coral, recently dead coral, and coral covered with red encrusting, green filamentous, or brown frondose algae. These clues may facilitate broad area assessments of shallow reef areas via aircraft, space shuttles, or satellites. (C) 2000 International Council for the Exploration of the Sea.