title: Tissue distributions and seasonal dynamics of the hepatotoxic microcystins-LR and -RR in two freshwater shrimps, Palaemon modestus and Macrobrachium nipponensis, from a large shallow, eutrophic lake of the subtropical China.
abstract: So far no information is available on microcystin (MC) contents in shrimps, prawns or crayfish from natural freshwaters. Tissue distributions and seasonal dynamics of the hepatotoxic MC-LR and -RR in two freshwater shrimps, Palaemon modestus and Macrobrachium nipponensis were studied monthly (during June-November, 2003) in a Chinese lake containing toxic cyanobacterial blooms. The shrimps P. modestus and M. nipponensis accumulated high MCs not only in the hepatopancreas (mean 4.29 and 0.53 microg g(-1) DW, respectively) but also in the gonad (mean 1.17 and 0.48 microg g(-1) DW, respectively), and the crayfish Procambarus clarkii accumulated as much as 0.93 microg g(-1) DW in the gonad. This indicates that gonads of these invertebrates are the second important target organ of MCs. P. modestus apparently accumulated more MCs in their organs than M. nipponensis, which might be a reflection of their difference in trophic niche. Eggs of the shrimps accumulated 8.4% (M. nipponensis, 0.27 microg g(-1) DW) and 29.0% (P. modestus, 2.34 microg g(-1) DW) of total toxin burden, indicating that MCs had been transferred into offspring from their adults. Among the shrimp muscle samples analyzed, 31% were above the provisional WHO TDI level, suggesting the risk of consuming shrimps in Lake Chaohu.
authors.affiliation: Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Sciences, Donghu South Road 7, Wuhan 430072, People's Republic of China.
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.forename: Ping
authors.initials: P
authors.lastname: Xie
mesh_terms: D000818:Animals; D003400:Astacoidea / Q000378:metabolism*; D001427:Bacterial Toxins / Q000302:isolation & purification / Q000493:pharmacokinetics*; D002681:China; D002853:Chromatography, Liquid; D000458:Cyanobacteria / Q000737:chemistry*; D005618:Fresh Water; D006066:Gonads / Q000378:metabolism; D043143:Hepatopancreas / Q000378:metabolism; D008387:Marine Toxins; D013058:Mass Spectrometry; D052998:Microcystins; D009132:Muscles / Q000378:metabolism; D010063:Ovum / Q000378:metabolism; D033541:Palaemonidae / Q000378:metabolism*; D010456:Peptides, Cyclic / Q000302:isolation & purification / Q000493:pharmacokinetics*; D012621:Seasons; D014018:Tissue Distribution
chemical_list: D001427:Bacterial Toxins; D008387:Marine Toxins; D052998:Microcystins; D010456:Peptides, Cyclic; C057862:cyanoginosin LR