Fish is a better source of protein than meats because it is easily digested and has fewer harmful fats. Cold water fish are high in essential fatty acids, but only when eaten raw. However, fish is just as high in cholesterol as chicken.
Garbage, oil spills, sewage, and airborne contaminants are turning the ocean into an international garbage dump. An example of this indiscriminate dumping of garbage into our oceans was brought to light in an article in the Toronto Sunday Sun, April 11, 1993. Soviet ships dumped twenty nuclear reactors at sea and plutonium from nuclear warheads...
The livers of fish concentrate the toxins. Monitoring the level of contaminants in fish livers helps to assess the damage to the earth’s oceans. In June 1995, Green Peace scientists tested cod-liver oil from six countries. They sampled 22 brands commonly sold in health food stores. Of the 22 samples, 21 had high levels of hazardous contaminants, such as organochlorine pesticides, DDT, lindane and polychlorinated byphenyls (PCBs). One of the popular brands tested would have introduced to the body 128 times the UK estimated daily intake of PCBs. Green Peace documented the potential health dangers of these chemicals. Organochlorine toxins are known to accumulate in human blood, breast milk and body fat, causing birth defects, infertility, and altered levels of sex hormones.
Fresh cold-water fish is definitely the best alternative when eating a moderate amount of fish in your diet. You can still purchase cold-water fish from Northern Canada which would be relatively free from toxins.