However, activity in benthic feeders has nothing to do with the trophic level.The result indicates that the difference was resulted from the duration of staying in the estuarine regions.

• 而底栖掠食之鱼种显然与营养阶层无关，推测可能因其停留于河口觅食之时间不同，停留时间越短多氯联苯累积量也越少。