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Fig. 4. Changes in five different ovarian indices and in the hepatosomatic index of
pregnant eelpout after 35 days water exposure to isopropanol (control, C), 25
µgl-1 4-tert-octylphenol (4-tOP) (OP25), 100
µgl-1 4-tOP (OP100) or 0.5 µgl-1
17ß-oestradiol (E2). (A) Ovarian fluid index (OFI). (B) Embryo
somatic index (ESI). (C) Ovarian sac somatic index (OSSI). (D) Ovarian sac
mass percentage (OSM). (E) Gonadosomatic index (GSI). (F) Hepatosomatic index
(HSI). OFI, ESI, OSSI, GSI and HSI are somatic indices calculated in relation
to the total mass of pregnant eelpout (excluding ovary). Values are means
± S.E.M. Significant difference from control is indicated by asterisks
(*P<0.05; **P<0.01;
***P<0.001).