Histopathologic biomarker response of clam, Ruditapes decussates, to organophosphorous pesticides reldan and roundup: A laboratory study

Abstract

Clam Ruditapes decussates was used as a biomonitoring organism to measure the potential impact of pollution. The present study investigated histological alterations of R. decussates following a long-term exposure to a sublethal-level of pesticides Reldan and Roundup. The clams were taken to the laboratory and kept for days to adjust to a continuous closed flow system with quality water control. After the adjustment period, clams were exposed either to sublethal concentrations of Reldan (0.6 µl L − 1 ) or Roundup (1.1 µl L − 1 ) for 90 days. Clams were taken to determine the histological damage at 30, 60 and 90 days. Most histological alterations were highly localized in the glandular cells of the gills, mantle tissues and digestive gland; secretions of glandular cells were found to be increased by increasing the time of exposure. Histopathological results showed the activation of resistance mechanisms that allowed the clams to survive under sublethal stresses. Thus, histological changes on localized tissues were sensitive and they have positive correlation to the time of exposure to the pesticides, suggesting that they may serve as biomarkers for Reldan and Roundup exposures.

Impact of Selected Environmental Pollutants on the Ultrastructure of the Gills in <i>Pinctada radiata</i> from Coastal Zones, Egypt

“…Histopathological alterations of gills of bivalve tissues have been shown to be responsive and sensitive to wide range of contaminants because they play an important role in respiration and food collection [33]- [35]. The histopathological changes of gills of bivalve in the present study are in agreement with [2] and [36] as they reported irregularity of gill lamellae of the cells, swelling of gill filaments and haemocytes infiltration of bivalve. Epithelial cells of the gills play a crucial role [37]; the damage in the epithelium results in serious dysfunction of tissues consequently leading to deleterious effect on the organization levels [2].…”

Toxicological perturbations of zinc oxide nanoparticles in theCoelatura aegyptiacamussel

“…The histological details of DG and gills of C. aegyptiaca are very similar to earlier reports on different bivalve species (Agwuocha et al, 2011;El-Shenawy et al, 2009;Kumar et al, 2011). Moreover, the DG is the site of multiple oxidative reactions and may, therefore, be a site of substantial free radical generation.…”

Histopathological and Biochemical Biomarker Response of Mussel, Unio Pictorum, to Carbamate Pesticide Carbaryl: A Laboratory Study

“…Cilia covered the surface of each lamellae or filament and connective tissue was integrated into the base of the gill lamellae (Plate1; Fig 1). Gill tissue consists of two plates on each side of the body; each of these plates consists of a number of filaments lined by columnar epithelial cells with ovoid nuclei and the core of the plates consists of loose connective tissue (El-Shenawy et al, 2009).…”