Lined Seahorse (Hippocampus hudsonius), FMNH no. 49126. Field Museum of Natural History, Chicago. The entire genus Hippocampus is listed in Appendix II of CITES, effective May 2004 and all Hippocampus species are listed as vulnerable or endangered on the IUCN Red List of species at risk. They are dried for traditional medicine and curios and caught live for aquarium or hobbyist use. The species is caught by shrimp trawling and by other fisheries, and is affected by loss of habitat due to coastal development and pollution.