M Rajathi D Modilal* 1 , A Rabeka1 , Cecily Rosemary Latha1 , G Kulandaimary2 and P Azhagu Saravana Babu

*1Corresponding Author: PG and Research Department of Zoology, Holy Cross College Autonomous, Tiruchirapalli-620 002 E-mail: rajathidmodilal@hcctrichy.zc.in 2PG Department of Library and Information Science, Holy Cross College Autonomous, Tiruchirapalli-620 002 3Department of Biotechnology, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Chennai-600 062

ABSTRACT

This study assessed the toxicity of sesame oil on Mesocyclops pehpeiensis, a common zooplankton species found in Uyyankondan River. The research encompassed acute and chronic toxicity tests, fecundity analysis, immobilization tests, and protein expression studies. The acute toxicity tests revealed concentration-dependent mortality in both nauplii and adults, with significant mortality observed at higher concentrations. Chronic exposure resulted in decreased survival rates and fecundity, indicating adverse effects on population dynamics. Immobilization tests showed significant effects of sesame oil on the mobility of adult copepods. Furthermore, protein expression analysis suggested potential adaptations to oil exposure. The findings highlight the ecological implications of sesame oil contamination on aquatic ecosystems and provide insights into copepod responses to oil pollutants.

Key words : Mesocyclops pehpeiensis, toxicity tests, fecundity analysis, immobilization tests

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