While the proximity of Haiti to the Windward Passage and the north-flowing currents off the Venezuelan coast place it in the path of major fish migrations, including tuna, marlin, bonito, and sardines, the commercial fishing industry is not developed. Reef fish, including giant grouper and rock lobster, are important food sources because deep-sea fishing is limited. Fisheries have been successfully developed in the small ponds and in the irrigation and drainage ditches of the Artibonite Plain. Carp and tertar, a native fish, are abundant, but lack of transport and other facilities limits this important food source to local consumption. The catch was estimated at 5,000 tons in 2000, including 200 tons of Caribbean spiny lobster and 380 tons of conch.
I still don't understand your suggestion. How can the use of 'these millions of tons of debris' to "build?" shallow water reefs... ever be a good thing, does any such building ever happen? I humbly suggest that such dumping/ placing in the sea, is a recipe for pollution and "corals, bone fish" etc being repulsed! Not to give you a science lesson or anything ... but this portion of a simple wiki article might aid in better understanding. I stand to be corrected.
"Runoff caused by farming and construction of roads, buildings, ports, channels, and harbours, can carry soil laden with carbon, nitrogen, phosphorus, and minerals. This nutrient-rich water can cause fleshy algae and phytoplankton to thrive in coastal areas, known as algal blooms, which have the potential to create hypoxic conditions by using all available oxygen. Some algae are toxic, and both plants reduce the levels of sunlight and oxygen, killing marine organisms such as fish and coral. The addition of too many nutrients such as phosphates and nitrates, a process known as eutrophication, is very damaging to reefs. High nitrate levels are toxic to corals, while phosphates slow down the growth of coral skeleton."
The full article: http://en.wikipedia.org/wiki/Coral_reef
"It was very urgent to do something and not let the country decay like that," he says. So he put together a marine environmental protection project based on the idea of "never give orders to fishermen: make suggestions and seek solutions by working with them."
To boost production, fish stocks have to be increased. "This can be done by building artificial reefs which can help some kinds of fish to breed," says Wiener. Through managing and supervising things by them-selves, the fishermen can protect the resources on their own. At the same time, they will have to "find other work, in agriculture for example, so they can earn a respectable living."
Wiener’s ideas are slowly catching on among the fishermen. Some have even taken up the challenge and are telling others they must stop overfishing and stop using the excuse that "if I don’t, someone else will." This kind of attitude has contributed to the crisis in Haiti’s fishing industry and is increasing the country’s present poverty.