woodsong可以看看这个http://www.epa.sa.gov.au/xstd_files/Water/Report/dolphin.pdf
这是SA EPA 1992年调查port的dolphin体内重金属和有机物含量。报告里面抽查了11条bream和10条mullet，查了重金属 汞，镉和铅 都是在食品安全标准之内的。从这个结果上来看好像都是安全的。但是这个样本的数量我看来有些少，不能完全代表。
上面的报告23页：
•Elevated levels of mercury were found in sediment samples taken from 5 sites. The contamination at some of these sites could have been due to past practices, but the possibility of recent contamination cannot be excluded.
•Monitoring of sediment showed that 17 of the 26 sites samples had high lead and zinc concentrations. The source of the lead and zinc is likely to be road runoff and indicates that more needs to be done to stop these pollutants from entering the river.
•Other contaminants found at high levels in the survey include copper at five sites and nickel at one site. Most of the high copper results, and the high nickel result, were near ship or boat building activities, or areas where boats are repaired or maintained. These activities need to be investigated.
看看33页河底沉淀物重金属的含量，铅和铜在很多地方含量都偏高。 我个人看法，Port River里面的鱼， 尤其是bream成年男人吃不大会致病，但是小孩和孕期妇女尽量避免，因为铅会在体内聚集，影响小孩的智力发育，也可以通过脐带传给婴儿。 |
