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Effect of Bis-2ethylhexyl phthalate (DEHP) on commercially important tropical fish pearl spot has not been demonstrated at environmental concentrations along with depuration. The species is estuarine, juvenile and difficult to maintain but widely consumed and well distributed in tropical estuaries. Antioxidant activity of SOD, CAT and GPx was enhanced on all exposure days for gill and muscle suggesting high oxidative stress, except on day 5. Detoxifying enzyme-GST behaved differentially in gill and muscle tissue after depuration, depicting inhibited activity of GST in gill leading to lipid peroxidation. However, the muscle tissue was able to recover from stress after 7 days of depuration with the help of detoxifying enzymes. Overcompensation of antioxidant activity was observed over disruption of homeostasis defining hormesis effect. Integrated biomarker (IBR) index depicted high toxicity during entire exposure time, but after depuration, gill could not mediate LPO at lowest concentration (10 μg/l) while muscle tissue recovered, suggesting persistence of stress in gill. [Display omitted] • DEHP at environmental concentration inducts oxidative stress in E. suratensis • Gill fails to eliminate ROS generated even after depuration period of 7 days. • Muscle of E. suratensis can cope with the DEHP generated stress with 7 days of depuration. • IBR delineates toxicity damge in gill induced by DEHP. [ABSTRACT FROM AUTHOR]

This paper characterize microplastics (MPs) in the heavily urbanized, brackish water Vembanad Lake (India), focussing on some commercially important bottom-feeding fishes and shellfish (Arius maculatus, Etroplus suratensis, E. maculatus and Villorita sp.). The average abundance of MPs was higher in the water column (872 ± 573 nos./m3) than in finfishes (15 ± 13 particles per fish) and shellfish (23 ± 20 nos./ind.). Fibre was the most abundant MP type in the water and the organisms examined. The size of MPs obtained from finfishes ranged between 0.04 and 4.73 mm (4 ± 3 mm), with a majority of particles being <4 mm. No correlation was found between biological features (e.g. gut length, mouth size) of fishes and the size of MPs in their gut. In Villorita sp. , the abundance of MPs was positively correlated with the size of the individuals. Raman spectroscopy confirmed the presence of chlorinated polyvinyl chloride, polyethylene, polypropylene and polyester in the samples. [Display omitted] • Microplastics present in all samples of bottom dwelling fishes and shellfish • Higher MP load in water column than in fishes and shellfish • MP types included chlorinated PVC, polyethylene, polypropylene and polyester. • More microplastics consumed by Arius maculatus and Villorita sp. • MP load in Villorita sp. correlated positively with size of individuals. [ABSTRACT FROM AUTHOR]