Microplastic pollution and heavy metal risk assessment in Perca fluviatilis from Anzali wetland: Implications for environmental health and human consumption.

The worldwide increase of anthropogenic contaminants in aquatic ecosystems has raised concerns, particularly heavy metals and microplastics (MPs), posing potential health risks for aquatic organisms. Therefore, this study aimed to investigate the presence of heavy metals (Cu, Ni, Pb, Cd, Hg, Zn, Mn, As, V, Co, Cr, Fe, and Se) and MPs in the muscle, liver, and gills of Perca fluviatilis Linnaeus 1758 from Anzali Wetland during the autumn-winter 2021 and spring-summer 2022 periods. The mean concentration of metals in the muscle was lower than that in the liver and gills.

Removal of lead from aqueous solutions using three biosorbents of aquatic origin with the emphasis on the affective factors.

The biosorptive potentials of three aquatics-based biosorbents, including shells of a bivalve mollusk and scales of two fish species for Pb removal from aqueous solutions were evaluated, for the first time. A Box-Behnken design with the response surface methodology was used to investigate the effects of the seven important variables (contact time, temperature, initial concentration, dosage, size, salinity and pH) on the sorption capacity of the sorbents. Among the seven studied factors, the effects of biosorbent dosage, initial concentration and pH were significant for all the response variables, while biosorbent size was not significant for any of the responses.

Use of C and N for the determination of the metal flux in the Caspian Sea fishes.

Biomagnification of metals (Cd, Cr, Cu, Mn, Ni, Zn, Fe) was investigated in 14 species of Caspian Sea commercial fishes using C and N analyses to decode their trophic position (TP). The stable nitrogen isotope ratios varied among the Caspian Sea fish species from 8.7 to 13.

Major and trace elements' concentrations in hard and soft tissues of kutum, Rutilus kutum, from the Caspian Sea and their potential use as biomonitoring tools.

The potential use of different hard and soft parts (otolith, scale, eye lens, dorsal spine, vertebral bone, muscle, and liver) of Rutilus kutum for biomonitoring of 13 major and trace elements (Br, Ca, Cl, Cu, Fe, K, Mg, Mn, Na, P, S, Sr, and Zn) was evaluated, for the first time. The specimens were sampled from three sampling sites in the Southern Caspian Sea in May 2016. Twenty specimens were collected from each site.