Growth-related changes in non-essential and essential metals in the liver of star-spotted smooth-hounds (dogfish) Mustelus manazo from the northern region of Japan. (October 2017)

• Record Type: Journal Article
• Authors: Endo, Tetsuya; Kimura, Osamu; Terasaki, Masaru; Fujii, Yukiko; Haraguchi, Koichi; Ohta, Chiho; Koga, Nobuyuki; Kato, Yoshihisa
• Is Part Of: Marine environmental research. Volume 131(2017)
• Page Start: 156
• Page End: 161
• Publication Date: 2017-10
• Subjects: Star-spotted smooth-hound (Mustelus manazo) -- Cadmium -- Mercury -- Zinc -- Copper -- Iron -- Manganese; Marine pollution -- Environmental aspects -- Periodicals; Marine ecology -- Periodicals; Mer -- Pollution -- Aspect de l'environnement -- Périodiques; Écologie marine -- Périodiques; Electronic journals; 577.705
• DOI: 10.1016/j.marenvres.2017.09.009
• Languages: English
• ISSNs: 0141-1136

Abstract

Abstract: We analyzed Cd, Hg, Zn, Cu, Mn and Fe concentrations in liver samples from male and female star-spotted smooth-hounds at various life stages. Male sharks of this species are known to reach their maximum body length (BL) more quickly than females, while females are known to mature later and live longer than males. Hepatic Cd and Hg concentrations in males and females markedly increased after maturation, but these increases proceeded earlier in males than in females. Hepatic Zn and Cu concentrations decreased during the growth stage of males and females, and thereafter increased concomitantly with increases of Cd and Hg burdens, forming a U-shaped curve over their lifespan, and the BL at which the lowest concentrations of Zn and Cu were observed was smaller in males than in females. These gender-related differences in those metals could reflect the faster growth and earlier cessation of growth in males. Highlights: Cd, Hg, Zn and Cu concentrations in liver of star-spotted smooth-hounds (sharks). Hepatic Cd and Hg markedly increased after maturation. Hepatic Zn and Cu decreased during the growth stage, and increased thereafter. Thus, U-shaped curves were found in hepatic Zn and Cu concentrations over lifespan.