• RAMYA. P
• SOUNDARARAJAN, M
• MERIN EMERALD, D
• SENTHAMILSELVI, P
• MANIKANDAN, S.R

Impact of heavy metal is common pollutants of estuarine ecosystems where they induce adverse effects on the aquatic biota. Estuarine mud crab, Scylla serrata is an important carb species in Tamil Nadu region having good nutritional values. Crabs living in close association with may accumulate heavy metals. In the present investigationLC50 values were determined for metals zinc toxicity in the mud crab, Scylla serrata when subjected to varying concentrations (0.5 to 0.80 mg/L). LC50 values of 96 hrs exposures was 0.43 mg/L. Increased ACP activity was noticed in the gills, abdominal muscles and hepatopancreas of estuarine mud crab, S. serrata treated with sublethal (15%) concentration of ZnCl2 on 5, 10 and 15 days of exposures. The present work on histological observation was carried out to know lesions in gill, abdominal muscle and hepatopancreas that had resulted from 15% sublethal concentration of heavy metal zinc exposed to estuarine mud crab, Scylla serrata.

Estuarine mud crab, Scylla serrata, Zinc, Gill, Abdominal muscle, Hepatopancreas.

"STUDIES ON TOXICITY EFFECT OF HEAVY METAL ZINC ON HISTOLOGICAL ALTERATIONS IN THE ESTUARINE MUD CRAB, Scylla serrata", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.228-237, June 2019, Available :http://www.jetir.org/papers/JETIR1907D37.pdf

"STUDIES ON TOXICITY EFFECT OF HEAVY METAL ZINC ON HISTOLOGICAL ALTERATIONS IN THE ESTUARINE MUD CRAB, Scylla serrata", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp228-237, June 2019, Available at : http://www.jetir.org/papers/JETIR1907D37.pdf