Response of the American lobster to the stress of shell disease
MetadataShow full item record
Shell disease is a problem affecting lobsters in eastern Long Island Sound causing disfiguration of the shell, decreasing the lobsters' value, and whereas mild and medium levels of the disease are not lethal, ultimately, severe cases result in mortality. Levels of the molting hormone, ecdysone, were quantitated, using a radioimmunoassay (RIA), in hemolymph of animals exhibiting shell disease. Our results indicate that levels of ecdysone were increased in the hemolymph of shell-diseased lobsters, with a medium level of expression of the disease to 89 ± 32 ng/mL (n = 76), whereas unaffected, presumably healthy ones had 57 ± 16 ng/mL (n = 210). In 7 of 10 months of the year shell-diseased animals had higher ecdysone levels in their hemolymph than unaffected animals. In addition, ecdysone levels were abnormally high, 165 ± 53 ng/mL (n = 5), in shell-diseased ovigerous lobsters, whereas normal unaffected ovigerous ones had low levels of this hormone, 13 ± 4 ng/mL (n = 7). These results indicate that shell disease may induce lobsters to alter the systemic levels of ecdysone, possibly serving as a defensive measure, allowing the animals to ward off the effects of shell disease through induced molting.
Author Posting. © National Shellfisheries Association, 2005. This article is posted here by permission of National Shellfisheries Association for personal use, not for redistribution. The definitive version was published in Journal of Shellfish Research 24 (2005): 757-760, doi:10.2983/0730-8000(2005)24[757:ROTALT]2.0.CO;2.
Showing items related by title, author, creator and subject.
Culture-dependent characterization of the microbial community associated with epizootic shell disease lesions in American lobster, Homarus americanus Chistoserdov, Andrei Y.; Smolowitz, Roxanna M.; Mirasol, Feliza; Hsu, Andrea (National Shellfisheries Association, 2005-10-01)Epizootic shell disease in the American lobster is an important factor affecting lobster fisheries in and around the Long Island Sound. It is a strictly dermal disease, because no correlation was observed between occurrence ...
Tarrant, Ann M.; Franks, Diana G.; Verslycke, Tim A. (National Shellfisheries Association, 2012-06)Epizootic shell disease (ESD) has been reported widely in American lobster (Homarus americanus, Milne Edwards) in southern New England. The appearance of irregular, deep lesions—characteristic of ESD—has been associated ...
Altered gene expression associated with epizootic shell disease in the American lobster, Homarus americanus Tarrant, Ann M.; Stegeman, John J.; Verslycke, Tim A. (2010-07-21)Epizootic shell disease is a poorly understood condition that has significantly affected the American lobster fishery in New England (northeastern US) since the 1990s. Here we present the results of a study to identify ...