title: Arsenic and Mn levels in Isaza (Gymnogobius isaza) during the mass mortality event in Lake Biwa, Japan.
abstract: The present study measured the concentrations of 25 elements (Li, Mg, V, Cr, Mn, Co, Ni, Cu, Zn, As, Se, Rb, Sr, Mo, Ag, Cd, In, Sn, Sb, Cs, Ba, Hg, Tl, Pb and Bi) in the whole body of Isaza which is an endemic fish species to Lake Biwa, Japan, and compared the values in the specimens from the mass mortality Isaza (MMI) and normal fresh Isaza (NFI). The mean levels of Mn and total As (T-As) were relatively higher in MMI than in NFI. In the T-As, highly toxic inorganic As was detected in MMI. Moreover we found Mn and As concentrations in surface sediment were extremely high and temporally increased. From all these results, we could infer that the dissolution of Mn and As from surface sediment of Lake Biwa might have been one of the cause for the mass mortality of Isaza.
authors.affiliation: Center for Marine Environmental Studies, Ehime University, 2-5 Bunkyo-cho, Matsuyama 790-8577, Japan.
authors.forename: Sawako Horai
authors.initials: SH
authors.lastname: Hirata
authors.forename: Daisuke
authors.initials: D
authors.lastname: Hayase
authors.forename: Akifumi
authors.initials: A
authors.lastname: Eguchi
authors.forename: Takaaki
authors.initials: T
authors.lastname: Itai
authors.forename: Kei
authors.initials: K
authors.lastname: Nomiyama
authors.forename: Tomohiko
authors.initials: T
authors.lastname: Isobe
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Agusa
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Michio
authors.initials: M
authors.lastname: Kumagai
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Tanabe
mesh_terms: D000818:Animals; D001151:Arsenic / Q000032:analysis / Q000378:metabolism*; D004784:Environmental Monitoring; D005393:Fish Diseases / Q000401:mortality; D019015:Geologic Sediments / Q000737:chemistry; D007564:Japan; D060106:Lakes / Q000737:chemistry*; D008345:Manganese / Q000032:analysis / Q000378:metabolism*; D010473:Perciformes / Q000378:metabolism*; D014131:Trace Elements / Q000032:analysis / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*
chemical_list: D014131:Trace Elements; D014874:Water Pollutants, Chemical; D008345:Manganese; D001151:Arsenic