美国地质测量局最新的一项研究表明，在对美国近 300 多条河流中的鱼取样测量后发现，所有的鱼样中都有汞。四分之一的鱼样超标（美国环保局的标准是 0.29 ppm 。 1 ppm= 百万分之一） .
汞污染主要来自烧煤，煤中的汞随烟进入大气，后又通过大气降水和地表径流到达河流。经过微生物的作用，成为有毒的甲基汞，进入食物链。因为污染物在食物链中一环一环地富集，处于水生食物链顶端的凶猛捕食鱼类一般含汞量最高。汞对神经系统有害。
（钓鱼的人要注意了：是不是越笨的鱼越好钓？笨鱼的神经系统受汞毒害较多。）
那什么样的海鲜河鲜含汞较低呢？食物链底端的和年幼的生物一般含汞量较低。如沙丁鱼是较安全的，因为它们吃藻类生长。小鱼，小虾，河蚌，扇贝也可安全食用。美国环保局建议每星期食用低汞水产品不超过 12 盎司（七两），汞含量较高的水产品不超过 6 盎司 （三两）。
儿童，怀孕妇女，或哺乳的母亲不应该吃任何含汞量高的鱼，如鲨鱼 (shark) ，旗鱼 (swordfish) ，鲭鱼 (king mackerel), 或方头鱼 (tilefish) 汞含量较高。
人类真是太作孽了，大自然的鱼都被污染成毒鱼了！
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美国自然资源保护委员会低汞和高汞鱼名单
低汞 ( Enjoy these fish): | 中汞 (Eat six servings or less per month): | 高汞（Eat three servings or less per month ): |
Anchovies 凤尾鱼, 鳀 | Bass (Striped, Black) 黑纹鲈鱼 | Bluefish 鯥 |
Butterfish 鲳 | Carp 鲤鱼 | Grouper 石斑鱼 |
Catfish 鲶 | Cod (Alaskan) 阿拉斯加鳕鱼 | Mackerel (Spanish, Gulf) 西班牙鲭鱼 |
Clam 文蛤 | Croaker (White Pacific) 白黄花鱼 | Sea Bass (Chilean) 智利海鲈鱼 |
Crab (Domestic) 蟹 | Halibut (Atlantic) 大西洋比目鱼 | Tuna (Canned Albacore) 金枪鱼 |
Crawfish/Crayfish 小龙虾 | Halibut (Pacific) 太平洋比目鱼 | Tuna (Yellowfin) 黄鳍金枪鱼 |
Croaker (Atlantic) 大西洋黄花鱼 | Jacksmelt (Silverside) 银汉鱼 | |
Flounder 鲆, 比目鱼 | Lobster 大龙虾 | 最高汞（Avoid eating ）: |
Haddock (Atlantic) 大西洋黑线鳕 | Mahi Mahi 鲯鳅鱼 | Mackerel (King)大鲭鱼 |
Hake 哈克鳕鱼 | Monkfish 和尚鱼, 扁鲨 | Marlin 马林鱼 |
Herring 鲱鱼 | Perch (Freshwater) 鲈鱼（淡水） | Orange Roughy 新西兰红鱼 |
Mackerel (N. Atlantic大西洋 鲭鱼 | Shark 鲨鱼 | |
Mullet 鲻鱼 | Skate 鳐 | Swordfish 剑鱼 |
Oyster 牡蛎 | Snapper 鲷鱼 | Tilefish 方头鱼 |
Perch (Ocean) 海鲈鱼 | Tuna (Canned)罐装 金枪鱼 | Tuna (Bigeye, Ahi) 大眼金枪鱼 |
Plaice 鲽 | Tuna (Skipjack) 金枪鱼（鲣鱼） | |
Pollock 波拉克青鳕 | Weakfish (Sea Trout) 海鳟 | |
Salmon (Canned) 鲑鱼（罐装） | ||
Salmon (Fresh) 鲑鱼（新鲜） | ||
Sardine 沙丁鱼 | ||
Scallop 扇贝 | ||
Shad (American) 鲥鱼 | ||
Shrimp 虾 | ||
Sole (Pacific) 鞋底鱼（太平洋） | ||
Squid (Calamari) 鱿鱼 | ||
Tilapia 罗非鱼 | ||
Trout (Freshwater) 鳟鱼（淡水) | ||
Whitefish 白鲑, 白鱼 | ||
Whiting 牙鳕 |
• 请问带鱼怎样？我妈在国内爱吃。 -黄桷树- ♀   (0 bytes) (21 reads) 8/22/09 |
 | • 根据联合国的报告 -北美老农- ♂  (598 bytes) (137 reads) 8/23/09 “Large predatory fish, such as king mackeral, pike, shark, swordfish, walleye, barracuda, scabbard and marlin, as well as seals and toothed whales, contain the highest average concentrations. While large tuna typically have levels of mercury that are similar to other large predatory fish, data indicate that the levels usually seen in canned tuna are substantially lower. This results from the fact that the tuna currently used for canned tuna are those of smaller size.” 带鱼是一种肉食性鱼类，但体型不大，它的汞含量相对其它海鱼来说可能会是中等。日本几年前的数据也表明带鱼汞含量是中等的。 |
| • 怎么没说三文鱼? -健康养生版主- ♀ (0 bytes) (7 reads) 8/22/09 |
| • 您老人家眼神不好, 看不到Salmon? -TBz- ♂ (2 bytes) (13 reads) 8/23/09 |
| • 哈哈，谢谢T大侠!以为会在最前面，所以，第一眼没看到，就...您老人? -健康养生版主- ♀ (0 bytes) (3 reads) 8/23/09 |
| • 两细节 -jaydad- ♂ (1073 bytes) (83 reads) 8/23/09 1) 蛋白污染不是脂肪污染-unlike dioxins or PCBs, methylmercury (the main organic form as found in fish and other animals) does not accumulate in fat tissue, instead, through double sulfur bond it binds to protein (fish meat), therefore throwing away skin and fat does not help lower mercury content 2) 排毒很慢很难巰基是关键-elimination of methylmercury is so slow that usually kids end up accumulating mercury to toxic level. Now that you realize the problem, you can help shift the balance (a little tiny bit) toward elimination, through food selection. The removal of methlymercury in body requires glutathione. Unfortunately, we can't take glutathione pill or glutathione injection because it is quickly degraded. We can provide the body with plenty of precursors to synthesize glutathione, in the form of mercapto (-SH) containing amino acid, cysteine. Asparagus, avocado, and garlic are easy choices. For adults, milk thistle and alpha lipoic acid are two commonly available supplements that are known to boost body (liver)'s glutathione level. |
| • 回复：谢谢jaydad的两细节! -健康养生版主- ♀ (0 bytes) (1 reads) 8/23/09 |
| • 我一直只知道Mackerel和Tuna是含汞高 -goingplace- ♀ (53 bytes) (6 reads) 8/23/09 平时吃了很多的Orange Roughy和Sea Bass，下次不再买了。 |
| • Thx. I found a reference for this. For those interested. -小义子- ♀ (192 bytes) (173 reads) 8/22/09 |
| • 中文鱼名，见内。。。 -北美老农- ♂ (54 bytes) (875 reads) 8/22/09 |
| • Hi it's so nice. Can u make it into a pdf so I can print? 大谢！ -小义子- ♀ (0 bytes) (3 reads) 8/22/09 |
| • How to post a pdf to WXC? -北美老农- ♂ (0 bytes) (2 reads) 8/22/09 |
| • 简单选择法：野生三文鱼，青皮小型鱼，浅海螃蟹 -uptrend- ♂ (0 bytes) (42 reads) 8/22/09 |
| • 什么是青皮小型鱼？无麟的吗？ -好吃狗- ♀ (0 bytes) (3 reads) 8/22/09 |
| • 是，象沙丁鱼，鲭鱼，鲱鱼等 -uptrend- ♂ (0 bytes) (4 reads) 8/22/09 |
| • 这次调查的结果是河里的鱼.所以喜欢吃small mouth bass的留心一点 -weston- (8 bytes) (83 reads) 8/22/09 Ocean Perch (大眼红鱼，海红鲈）   |
