title: Dynamics of microcystins-LR and -RR in the phytoplanktivorous silver carp in a sub-chronic toxicity experiment.
abstract: A sub-chronic toxicity experiment was conducted to examine tissue distribution and depuration of two microcystins (microcystin-LR and microcystin -RR) in the phytoplanktivorous filter-feeding silver carp during a course of 80 days. Two large tanks (A, B) were used, and in Tank A, the fish were fed naturally with fresh Microcystis viridis cells (collected from a eutrophic pond) throughout the experiment, while in Tank B, the food of the fish were M. viridis cells for the first 40 days and then changed to artificial carp feed. High Performance Liquid Chromatography (HPLC) was used to measure MC-LR and MC-RR in the M. viridis cells, the seston, and the intestine, blood, liver and muscle tissue of silver carp at an interval of 20 days. MC-RR and MC-LR in the collected Microcystis cells varied between 268-580 and 110-292 microg g(-1) DW, respectively. In Tank A, MC-RR and MC-LR varied between 41.5-99.5 and 6.9-15.8 microg g(-1) DW in the seston, respectively. The maximum MC-RR in the blood, liver and muscle of the fish was 49.7, 17.8 and 1.77 microg g(-1) DW, respectively. No MC-LR was detectable in the muscle and blood samples of the silver carp in spite of the abundant presence of this toxin in the intestines (for the liver, there was only one case when a relatively minor quantity was detected). These findings contrast with previous experimental results on rainbow trout. Perhaps silver carp has a mechanism to degrade MC-LR actively and to inhibit MC-LR transportation across the intestines. The depuration of MC-RR concentrations occurred slowly than uptakes in blood, liver and muscle, and the depuration rate was in the order of blood>liver>muscle. The grazing ability of silver carp on toxic cyanobacteria suggests an applicability of using phytoplanktivorous fish to counteract cyanotoxin contamination in eutrophic waters.
authors.affiliation: Donghu Experimental Station of Lake Ecosystems, State Key Laboratory for Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, PR China.
authors.forename: Liqiang
authors.initials: L
authors.lastname: Xie
authors.forename: Ping
authors.initials: P
authors.lastname: Xie
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Ozawa
authors.forename: Takamitsu
authors.initials: T
authors.lastname: Honma
authors.forename: Atsushi
authors.initials: A
authors.lastname: Yokoyama
authors.forename: Ho-Dong
authors.initials: HD
authors.lastname: Park
mesh_terms: D000818:Animals; D001427:Bacterial Toxins / Q000493:pharmacokinetics* / Q000633:toxicity; D002273:Carcinogens / Q000493:pharmacokinetics* / Q000633:toxicity; D002347:Carps / Q000378:metabolism*; D005068:Eutrophication; D005247:Feeding Behavior; D008387:Marine Toxins; D052998:Microcystins; D010456:Peptides, Cyclic / Q000493:pharmacokinetics* / Q000633:toxicity; D010839:Phytoplankton; D018675:Toxicity Tests
chemical_list: D001427:Bacterial Toxins; D002273:Carcinogens; D008387:Marine Toxins; D052998:Microcystins; D010456:Peptides, Cyclic; C078588:microcystin; C063855:microcystin RR; C057862:cyanoginosin LR