title: Levels of mercury in muscle and liver of star-spotted dogfish (Mustelus manazo) from the northern region of Japan: a comparison with spiny dogfish (Squalus acanthias).
abstract: We analyzed mercury (Hg) concentrations in muscle and liver samples of star-spotted dogfish (Mustelus manazo) caught off the northern region of Japan and compared them with those of spiny dogfish (Squalus acanthias) caught in the same region. The average body length of male star-spotted dogfish specimens was significantly smaller than that of female specimens, reflecting the slower growth rate of male fish. Hg concentrations in liver and muscle increased with increases in body length and estimated age of both male and female star-spotted dogfish specimens. However, the relationships between Hg concentration in liver or muscle and body length or estimated age of male specimens differed markedly from those of female specimens, reflecting differences in growth rate and cessation of growth on reaching maturity. Marked increases in Hg concentration in liver of male and female star-spotted dogfish specimens were observed slightly later than increases in Hg concentration in muscle of those specimens due to growth cessation. These marked increases in Hg in liver may reflect increases in Hg due to the formation of mercury selenide. Similar results were previously reported in spiny dogfish specimens, except spiny dogfish showed only trace levels of Hg in liver (Endo et al., Chemosphere 77:1333-1337, 2009). The greater lipid content in liver and the larger liver size in spiny dogfish may explain the much lower levels of Hg observed in liver of spiny dogfish compared with those in the star-spotted dogfish.
authors.affiliation: Faculty of Pharmaceutical Sciences, School of Pharmaceutical Sciences, Health Sciences University of Hokkaido, 1757, Ishikari-Tobetsu, Hokkaido, 061-0293, Japan. endotty@hoku-iryo-u.ac.jp
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Endo
authors.forename: Yohsuke
authors.initials: Y
authors.lastname: Hisamichi
authors.forename: Osamu
authors.initials: O
authors.lastname: Kimura
authors.forename: Hideki
authors.initials: H
authors.lastname: Ogasawara
authors.forename: Chiho
authors.initials: C
authors.lastname: Ohta
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Koga
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Kato
authors.forename: Koichi
authors.initials: K
authors.lastname: Haraguchi
mesh_terms: D000375:Aging / Q000378:metabolism; D000818:Animals; D049628:Body Size / Q000187:drug effects; D004284:Dogfish / Q000378:metabolism; D004784:Environmental Monitoring / Q000379:methods*; D005260:Female; D007564:Japan; D008099:Liver / Q000737:chemistry / Q000378:metabolism*; D008297:Male; D008628:Mercury / Q000032:analysis* / Q000493:pharmacokinetics; D018482:Muscle, Skeletal / Q000737:chemistry / Q000378:metabolism*; D048251:Squalus acanthias / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000493:pharmacokinetics
chemical_list: D014874:Water Pollutants, Chemical; D008628:Mercury