Histopathology of the Foot, Gill and Digestive Gland Tissues of Freshwater Mussel, Lamellidens marginalis Exposed to Oil Effluent

We investigated the histopathological alterations in tissues of freshwater mussel, Lamellidens marginalis response to oil effluent. Based on previous acute toxicity, two sub lethal [1/4th (11.88ppt) and 1/10th (8.55ppt)] concentrations effluent (hydrocarbon) were prepared exposed mussels. In a first series experiment, animals exposed/accumulated for 30 days [Ist, 8th, 15th, 22nd 30th days] by oil. second thereafter transferred clean water kept it up assess recovery pattern (depuration). At seven-day intervals, analyzed foot, gill digestive gland mussel. First experimental observation showed remarkable damages foot (disorganized outer epithelium, necrosis cell, formation lumina, disorganized muscle bundle); (disruption filaments, odema formation, necrosis, dis-aggregated cilia) (stoma, detached glandular vertical clefts, presence leucocytes, dense accumulation luminal material) also inducement are confirmed with aforementioned results. was found that tended accumulate duration-dose-dependent manner. Tissue burden mussels completely restored at day. The present findings may be early warning signals pollution. conclusion highly toxic marginalis.