374
1. Pellerito . R. Barbieri· R. Di Stefano . M. Scopelliti . C. Pellerito . T. Fiore . F. Triolo
Fig. 15.32. Nile tilapia kidneys
of control and TPTH-treated
groups after four months of
exposure (400X); a control (water), showing normal appearance of glomerulus (G) and
renal corpuscle (C). Hyaline
droplets (arrowhead) in the
first proximal epithelial cells
(PI) are observed; b treated
with 1 mg t 1 TPTH, showing
more severe glomerulus contraction (G) and widening of
Bowman's capsules (arrowhead). First proximal epithelial
cells (PI) are filled with large
hyaline droplets (arrow);
c treated with 3 mg t 1 TPTH,
showing numerous large hyaline droplets (arrowhead) in
epithelial cells of first proximal
tubules, adapted from
Visoottiviseth et al. (1999)
b
a
c
ticular, the hepatocytes underwent congestion and dilatation of sinusoidal spaces,
cytoplasmic pallor, vacuolation and accumulation of hyaline droplets, subcapsular and
scattered focal necrosis (Fig. 15.31).
Hydropic degeneration, accumulation of hyaline droplets in the tubular epithelial
cells, congestion of peritubular capillaries and detachment of tubular epithelial cells
were observed in the kidney, in addition to collapse of the glomerular capillary in more
severe cases (Fig. 15.32).
Finally, hyperplasia of the covering gill epithelium, congestion of gill capillaries and
vessel and aneurismal formation of gill lamellar capillaries have been noted (Fig. 15.33).
Imposex or masculinization of the muricid Thais distinguenda was induced
by tributyltin contamination around the major harbours of Phuket Island, Thailand
(Bech 1999).50 specimens of Thais distinguenda were collected in 21 stations in the
1996-1998 period and analysed for imposex (Table 15.19).