Histopathological alteration of white seabass ( Lates calcariffer) gills in subacute zinc exposure

Abstract

A study was conducted on seabass fingerlings (Lates calcarifer) to determine the histopathological alteration of subacute zinc exposures. The experiment was also to determine the lethal concentration of zinc to the seabass fingerlings and the bioaccumulation of zinc to white seabass fingerlings. Toxicity tests were conducted by seabass fingerlings were exposed to nominal zinc concentration of 0.56, 1.0, 3.2, 10.0, and 32.0 mgL- 1 with one control (no zinc exposure) in two replicates. The 96hr LC50 values of zinc for seabass was found to be 5.8135±0.3019 mgL- 1 • The subacute zinc exposures conducted in 0.01, 0.1 and 0.25 % of the 96h LC50 value and control (not exposed to zinc) in two replicates. The bioaccumulation of zinc in seabass showed complex pattern due to high zinc concentration in the water sources. Gills histopathology changes showed the gills damage consist of tissue edema, clubbing of lamellar, swelling and enlargement of lamellar, hyperplasia of lamellar, tissue rupture and fusion of secondary lamellar become more prominent