The basic mechanism for the absorption for the metals is not known in case of fish but some information is available that these metals absorb across gills and intestinal tract and then distributed via circulation in the whole body of fish. Heavy metals include cadmium, arsenic mercury and lead etc. which are existing in natural environment or in other hand these metals are present in the earth crust naturally in a very minute amount. Fish containing products contain different amount of metals. Copper is required in certain limit by human bodies, but when its amount of intake is increasing then it causes serious disorders like kidney failure, liver damage especially During Wilson’s disorder. Some fish varieties like those of shellfish etc. accumulate mercury in their bodies which form methylmercury which is extremely toxic that causes organ mercury compound. To be effective, bubbler/diffuser systems must be turned on early in the spring and run nonstop all summer until temperatures begin to cool in the fall.