Studies on lead accumulation and elimination in the tissues of Paralichthys olivaceus

Rule of lead accumulation and elimination in the tissues of viscus,muscle,gill of Paralichthy solivaceus and effects of TOC concentration in seawater on the accumulation of lead in the tissues were studied.It is demonstrated that when the lead concentration is 0.5 mg/dm³,each tissue's lead accumulation increases with the elapse of time, on the ninth day the tissues.lead accumulations reach equilibr ium.At that time,the accumulation order of lead in the fish tissues is viscus(649.8 mg/kg) greater than gill(237.36 mg/kg) greater than muscle(59.71 mg/kg).The lead concentration is maintained at 0.5mg/dm³ for 13 d.During the depuration days all tissues.lead accumulations decrease with the elapse of time.On the 10th day the rate of elimination sequence of lead in the fish tissues is viscus (84.85%) greater than gill(61.26%) greater than muscle(57.03%).The TOC concentration in seawater has significant effect on lead accumulation.The lead accumulation decreases significantly with the increase of TOC concentration.It is demonstrated that TOC in seawater candecrease the bioavailability of lead.