The live oyster substrate hosted spat at both sites, but the dead oyster shells and stone/rubble substrates had inconsistent spat occurrences between the two sites. The greatest density of spat was observed during the second week in the windowpane substrate at both sites. Spat is oyster larvea that attaches to the substrate It is used as an indicator of growth and survival rate. ‘Spat’ is oyster larvae attached to shells. Water samples and estimates of ‘spat’ density on each substrate was collected every two weeks for 24 weeks from the beginning of May to mid-October at the full and new moon. bamboo mattress structures with four test substrates: rubble/stone, windowpane shells, live oysters, and dead oyster shells. Substrates were put on bamboo woven mattresses designed with four compartments one for each substrate so the effectiveness of each could be compared and contrasted against the other substrates. Investigators were interested in determining which substrate is most suitable for the reefs: dead oyster shells, live oysters, windowpane shells, or stone/rubble. Salt extraction, agriculture, and fisheries are the main activities on both islands. Two sites were chosen for this project, the first off the southeast side of Moheshkhali Island in a mudflat with a mangrove forest, and the second off the southeast side of Kutubdia Island, also in a mudflat, but this time protected by an earthen barrier coated with brick cement. Research areas were identified based on where natural oyster beds are already found, which is generally where there are artificial structures such as pylons from jetties and bridges. The hope is that the oyster beds will reduce ocean-related stress on coastal Bangladesh the reefs will theoretically redirect sediment deposition and increase shoreline stability, with the potential of also supporting local fisheries by providing habitat for fish and crustaceans. One method proposed in Bangladesh is the use of oyster aquaculture for development of artificial bivalve reefs. ‘ Ecosystem engineering’ could be the solution. However, with projections of rising sea level and intensified storms in the future, there is a need for solutions that can help to mitigate coastal erosion issues in Bangladesh on more of a long-term basis. Current means of reducing coastal erosion are primarily short term barrier solutions, such as concrete blocks, earthen dikes, and sand filled tubes. Geographically, Bangladesh is vulnerable to coastal erosion and other damages from natural weather patterns such as monsoons, store surges, and cyclones. ISSN: 0859-600x Vol XV111-1 January-March 2013īangladesh is home to 35 million people who heavily rely on its 166,000 km 2 of maritime territory as a source of natural resources. “Oyster aquaculture for coastal defense with food production in Bangladesh.” Aquaculture Asia (2013).
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