HISTOLOGICAL STUDY ON GILL OF Tilapia guineensis EXPOSED TO SODIUM DODECYL SULPHATE
Keywords:
Toxicity, Dispersant, Tilapia guineensis, Histology Oil-spillAbstract
Oil spill environments are commonly cleaned using dispersants such as sodium dodecyl sulphate (SDS). Dispersants are chemicals containing surfactants that break oil into small droplets, with surfactants having both polar and non-polar moieties. The acute toxicity of SDS was evaluated on Tilapia guineensis by exposing the fish to different SDS concentrations using a semi-static agitation procedure. Histological staining was performed to investigate the effects of SDS on gill tissues. Gills were preserved, sectioned (5–20 microns), embedded in paraffin, and stained with haematoxylin and eosin to make cells visible under the microscope. Control fish showed normal gill histology, whereas exposure to 40 mg/L and 80 mg/L SDS for 12 hours caused congestion and narrowing of intra-tubular spaces. This damage included expansion of lymphatic channels, disruption of micro-ridges, cell membrane vasculation, and cell degeneration. Exposure to 80 mg/L SDS for 24 hours resulted in even more severe tissue damage. These findings indicate that SDS at these concentrations is toxic to aquatic organisms and poses environmental risks.Downloads
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