【案例】周某承包了村里的200亩鱼塘。这年5月,周某发现鱼塘有死鱼出现,半月后,出现大量死鱼,损失约5万元。经环境监测部门监测,发现水中污染物严重超标。由于鱼塘上游仅有一家排污企业,且在该排污企业超标排放的污水中发现了与鱼塘中同样的污染物质。该排污企业该如何承担责任? [Case] ​​Zhou contracted the village of 200 acres of fish ponds. May this year, Zhou found dead fish appear in fish ponds, a half months later, a large number of dead fish, the loss of about 50,000 yuan. Monitoring by the environmental monitoring department, found that water pollutants seriously exceeded. Due to the fact that there is only one sewage enterprise upstream of the fish ponds, the same pollutants as those found in the fish ponds have been found in the sewage discharged by the polluters. The sewage companies how to take responsibility?