Eating fish also has widely acknowledged health benefits. A
recent report indicates eating fish frequently may cut chances of
developing age-related macular degeneration. [2]

Currently, FDA suggests American to have two meals of fish and
shellfish (12 ounces) a week, but limit albacore, or "white," tuna
to one meal (6 ounces) per week because of its higher mercury
levels. Elevated mercury levels have been linked to learning
disabilities and developmental delays in children and to heart,
nervous system and kidney damage in adults.

A study indicates some imports of canned tuna from South
America have mercury levels higher than the federal limit. They
tend to catch larger, more mature fish, which tend to have higher
mercury levels: Calmex - 1.4 ppm, and Sardinar - 1.3 ppm. On
the other hand, tuna from Asia had the lowest average levels of
mercury. [1]

Fish oils and supplements also have side effects Low dose fish
oil extracts are found to be beneficial to healthy, older or sick
subjects, but long-term use of high dose fish oil may lead to
harmful side effects. The most common side effects of fish oil
supplements include fishy odor on the breath, stomach upset,
gastrointestinal disturbances, and greasy stools.

Cod liver oil benefits and side effects
Fish oil benefits and side effects

[1] Imported tuna may have higher mercury level  Associated Press July 11, 2006. [2]
Yvonne Lee - Eating Fish Reduces Risk Of Eye Disease In Seniors All Headline News
July 11, 2006.
Fish Oil Side Effects
Fish Oil Side Effects (High
Korean Pine Nut Oil
Krill Oil
Krill Oil Vs Fish Oil
Linseed Oil
Olive Oil
Oregano Oil
Peppermint Oil
Pumpkin Seed Oil
Salmon Oil
Tea Tree Oil
Bio-effective Oils

Borage Oil
Canola Oil
Coconut Oil
Cod Liver Oil
Cod Liver Oil - High Blood Pressure
Corn Oil
Flaxseed Vs Flaxseed Oil
Flaxseed Meal / lignans
Flaxseed Oil Side Effects / Benefits
Flaxseed Oil Vs Fish Oil
Evening Primrose Oil
FDA Letter to Fish. (Oil Spill)