Artificial reefs for marine habitat enhancement in Southeast Asia.

This study highlights the potential role of artificial reefs in Coastal Resource Management in the ASEAN region. It discusses the considerations necessary to maximize the effectiveness of artificial reefs as a means for fisheries management and habitat enhancement. It illustrates many practical examples of how artificial reefs have been used effectively and what are their limitations.

Artificial Reef Project, Thailand.

A review of the fishery in the Gulf of Thailand is presented which notes that the current level of trawling effort is excessive and suggests that a substantially lower trawling effort would probably improve the total economic value of the catch by reducing the proportion of trash fish in the catch and increasing the proportion and size at landing of fishes with high commercial value.

Reefs at risk revisited

Under the Reefs at Risk Revisited project, World Resources Institute (WRI) and its partners (The Nature Conservancy, The WorldFish Center, ICRAN etc) have developed a new, detailed assessment of the status of and threats to the world's coral reefs. This information is intended to raise awareness about the location and severity of threats to coral reefs. These results can also catalyze opportunities for changes in policy and practice that could safeguard coral reefs and the benefits they provide to people for future generation.

The marine fisheries of Jamaica

The marine fisheries of Jamaica are almost entirely artisanal, with at least 15 000 fishers and an annual catch of approximately 7 000 t. A recent development is a small industrial fishery for queen conch and spiny lobster that earns significant foreign exchange for the country. The major aquatic resources are coral reef fishes, conch, lobster, small pelagics and seasonal large pelagics. The major fishing grounds are the southern island shelf and Pedro Bank, a large oceanic bank 150 km to the southwest of Kingston.

Tropical marine fisheries and the future of coral reefs: a brief review with emphasis on Southeast Asia.

Rapidly growing human population and economic inequities are placing increasing demands on tropical marine fisheries. Coral reef fisheries constitute an important source of food and livelihood on a global scale. However, destructive fishing is a major cause of coral reef degradation and is often associated with Malthusian overfishing, a condition related to poverty and coastal crowding. Studies based on the Gordon-Schaefer bioeconomic model indicate that for many coral reef areas, suggest a return to optimal resource use will require a reduction of fishing effort by approximately 60%.

Choosing the appropriate spatial resolution for monitoring coral bleaching events using remote sensing

Bleached corals provide a strong optical signal that suggest that remote sensing investigations of major bleaching events are feasible using airborne or satellite sensors. However, patchy coral cover, varying intensities of bleaching, and water depths are likely to limit the application of remoter sensing techniques in monitoring and mapping coral bleaching. Today, satellite multi-spectral sensors routinely provide images of reefs from 4 m (Ikonos) to 30 m resolution (Landsat); however, the adequacy of these sensors for monitoring and mapping bleaching events remains unclear.

Blast fishing in southwest Sulawesi, Indonesia.

Blast fishing has been a widespread and accepted fishing technique in Indonesia for over 50 years. The largest coral reef fishery in Indonesia is around the Spermonde archipelago in southwest Sulawesi. With the expanding population and the increasing demand for fish for export, fishing has intensified and fish catches per unit effort are stable or declining. The use of bombs made with a mixture of kerosene and fertilizer is widely prevalent. In the market of the city of Ujung Pendang, an estimated 10-40% of the fish from capture fisheries are caught through blast fishing.

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