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Sexual maturation and reproductive zinc physiology in the female squirrelfish

E. David Thompson¹, Gregory D. Mayer², Patrick J. Walsh² and Christer Hogstrand^1,2,3,*

¹ T. H. Morgan School of Biological Sciences, 101 Morgan Building, University of Kentucky, Lexington, KY 40506, USA
² Division of Marine Biology and Fisheries, and NIEHS Marine and Freshwater Biomedical Science Center, Rosenstiel School of Marine and Atmospheric Science (RSMAS), University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, USA
³ School of Health and Life Sciences, King's College London, Franklin—Wilkins Building, 150 Stamford Street, London SE1 9NN, UK

View larger version (14K): [in a new window]   Fig. 1. Comparisons of zinc concentrations in the liver and blood plasma of untreated immature and mature female squirrelfish. Results are arithmetic means ± S.E.M. (N=11-15 fish). Asterisks indicate values that are significantly different from the sham-treated control at the same sampling point (P<0.05; Mann—Whitney U-test).

View larger version (16K): [in a new window]   Fig. 2. Relationship of gonadosomatic index (GSI) and (A) hepatic and (B) plasma zinc levels in female squirrelfish (N=21 fish).

View larger version (13K): [in a new window]   Fig. 3. Relationship of gonadosomatic index (GSI) and hepatic metallothionein (MT) mRNA levels in female squirrelfish (N=21 fish).

View larger version (13K): [in a new window]   Fig. 4. Comparisons of liver-somatic index (LSI) in sham-injected (black bars) and E2-treated (white bars) immature (A) and mature (B) female squirrelfish. Fish were injected on days 0, 2 and 4, and sampled on days 5, 6 and 10 of the experiment. Results are arithmetic means ± S.E.M. (N=2-7 fish). Asterisks indicate values that are significantly different from the sham-treated control at the same sampling point (P<0.05; Dunn's test).

View larger version (14K): [in a new window]   Fig. 5. Effects of E2 administration on gonadosomatic index (GSI) in immature (A) and mature (B) female squirrelfish at days 5, 6, and 10 of the experiment (N=2-7 fish). Results are arithmetic means ± S.E.M. Asterisks indicate values that are significantly different from the sham-treated control at the same sampling point (P<0.05; Dunn's test).

View larger version (17K): [in a new window]   Fig. 6. Effects of E2 administration on plasma zinc concentrations in immature (A) and mature (B) female squirrelfish at days 5, 6, and 10 of the experiment (N=2-6 fish). Results are arithmetic means ± S.E.M. Asterisks indicate values that are significantly different from the sham-treated control at the same sampling point (P<0.05; Dunn's test).

View larger version (12K): [in a new window]   Fig. 7. Effects of E2 administration on MT levels in the nuclear fraction of liver cells of immature (A) and mature (B) female squirrelfish at days 5, 6, and 10 of the experiment (N=2-6 fish). Results are arithmetic means ± S.E.M. Asterisks indicate values that are significantly different from the sham-treated control at the same sampling point (P<0.05; Dunn's test).