Amazonian manatees, and there are no management plans except in Colombia. Amazonian manatees, especially calves, are sometimes illegally sold as pets, but there are several institutions that care for and rescue these orphans, with the possibility of releasing them into the wild. The body parts of dugongs are used as medicinal remedies across the Indian Ocean. Manatees in Cuba have faced poaching, entanglement and pollution. The area has some of the most extensive and best manatee habitat in the Caribbean, but the population has been unable to thrive there. Existing information about manatees in Cuba is limited; this makes it difficult to spread awareness, which therefore enhances the risks of poaching and entanglement in fishing nets in coastal communities. Poaching of the manatees has been a significant issue since the 1970s, when it was initially reported that the hunting was taking its toll on the manatee population in Cuba. In 1975 it was reported that the manatees' population in Cuba was rare and declining at an alarming rate due to pollution and hunting. In 1996 manatees were placed under protection through Fishery Decree Law 164. This law provided penalties against those who manipulate, harm, or injure manatees. The hunting of manatees in Cuba in the 1990s may have been the result of economic hardship, with the manatees being seen as a source of protein. Although there have been efforts made to protect the population of manatees in Cuba, it has not proven to be effective as those working to protect the population had hoped. Many of these areas are seen as parks that exist only on paper, and they do not have a significant impact on conversation and protection. Environmental hazards induced by humans also puts sirenians at risk. Sirenians, especially the West Indian manatee, face high mortality from watercraft collision, and about half of all West Indian manatee deaths are caused by watercraft collisions. An increased use of hydroelectric power and consequent damming of rivers increase waterway traffic, which can lead to vessel collisions, and manatees may become entrapped in navigational locks. The urbanization of the coastline of areas such as the Caribbean, Florida, and Australia can result in a decline in seagrass populations. Seagrass meadows are also highly susceptible to pollution, and are currently among the top threatened ecosystems on Earth. Reliable areas of warm water in Florida are generally the result of discharge from power plants, but