World Aquaculture 2025 India

November 10 - 13, 2025

Hyderabad, India

Add To Calendar 11/11/2025 15:00:0011/11/2025 15:20:00Asia/KolkataWorld Aquaculture 2025, IndiaHEMATOLOGY, OXIDATIVE STRESS AND BIOCHEMICAL RESPONSES IN Clarias gariepinus POST FINGERLINGS EXPOSED TO SUBLETHAL DOSES OF EMAMECTIN BENZOATEMR1.01The World Aquaculture Societyjohnc@was.orgfalseDD/MM/YYYYanrl65yqlzh3g1q0dme13067

HEMATOLOGY, OXIDATIVE STRESS AND BIOCHEMICAL RESPONSES IN Clarias gariepinus POST FINGERLINGS EXPOSED TO SUBLETHAL DOSES OF EMAMECTIN BENZOATE

Emmanuel Ogueji*, Joshua Ekpenyong, Christopher Ezike, Elizabeth Tabi, Michael Olaolu, Abubakar Yaji, Gabriel Amana, Adewale Adeolu, Roseline Nwose,  Joseph Nwakpa,

Department of Fisheries and Aquaculture, Alex Ekwueme Federal University, Ndufu Alike.Abakaliki, Nigeria



Emamectin benzoate (EMB) is a highly neurotoxic insecticide used in agronomy, animal husbandry, and farming of aquatic organisms to control pests. Runoff from these sources can harm fish . In this work, e xperimental groups were subjected to four  doses of 17 µg L-1, 34µgL-1 , and 68  µg L-1, and control without EMB for 14 days, after which fish was monitored for one week (7 days) depuration period to estimate recovery potential of the fish. In days 1, 7 and 14 durations of exposure, stress biomarkers including aspartate aminotransferase (AST), alkaline phosphatase (ALP), alanine aminotransferase (ALT) and blood Urea and Creatinine levels increased with dose and duration, and after 7 days depuration period, they maintained elevated values . The antioxidant enzymes superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPx) decreased significantly (p < 0.05), as did packed cell volume (PCV), mean corpuscular volume (MCV), hemoglobin concentration (Hb), and red blood cell count (RBCC). The trend continued after 7 days of depuration. There were significant (p<0.05) leukocytosis, lymphopenia and neutrophilia in treated fish.  In contrast, lipid peroxidation and glutathione reductase (GR) levels increased but returned to normal after 7 days of depuration. The altered hematological parameters were indicative of immune suppression and anemia in the exposed fish, while the altered antioxidant enzymes implied that reactive oxygen species (ROS) may have played a role in the toxic action of EMB. This study showed that 7 day depuration time was insufficient to repair the harm caused by EMB stress to the fish.