Monitoring anthropogenic sewage pollution on mangrove creeks in southern Mozambique: A test of Palaemon concinnus Dana, 1852 (Palaemonidae) as a biological indicator

► Domestic sewage discharges at low concentrations increase fauna mangrove population parameters, due to the nutrient limitations. ► Shrimps in the peri-urban mangrove location were larger, had longer reproductive periods, higher ovigerous females proportions and better embryo. ► Physiological indice analysis (RNA/DNA ratio) between pristine and peri-urban mangroves. ► Within the peri-urban mangrove, high levels of parasitation by Pseudionee longata caused stress and potential effects on the host population dynamics. ► The effects of sewage on P. concinnus population increased the choice of possible bioindicators in East African coastal water.