Depth distributi.on of tarpon (Megalops atlantica), pinfish (Lagodon rhomboides), Atlantic Croaker (Micropogon undulatus), black drum (Pogonias cromis), and striped mullet (Mugil cephalus) placed in cylindrical cages extending from the surface to the bottom of the thermal effluent of a steam-electric power plant was monitored daily using a depth locator. Temperature,conductivity, pH, dissolved oxygen, turbidity, and gas saturation levels were recorded immediately after recording the depth distribution data. Overall trends suggested that intraspecific interaction had an effect on fish distribution. Pinfish, black drum, and Atlantic croaker reacted to ambient light levels. Mean depth of pinfish, black drum, and striped mullet was shown to be significantly correlated with %-total gas saturation. Tarpon and black drum responded to temperature, croaker responded to conductivity, and striped mullet responded to %oxygen saturation.