| Abstract: | Chlorine, used to control bio fouling in coastal power station, sea water cooling circuits, is also toxic to non fouling marine organisms. Experiments quantified the toxicity of power station cooling water to postlarval Atlantic herring Clupea harengus L. Postlarvae were exposed to chlorinated sea water for 30 min, to simulate passage through a typical power station cooling water circuit, and 24h, during which detectable chlorine decayed away, to simulate a ‘worst case’ exposure. Twenty four hour LC50S were 0·63 ppm initial concentration for 30 min exposure and 0·36 ppm initial concentration for 24 h exposure. The present findings are contrasted with work assessing the suitability of power station cooling water for aquaculture which used maintained concentrations of chlorine. |
