Difference between Mudjacking and Polyurethane Concrete Raising. Also called foam lifting, polyurethane for concrete raising has been in practice for about 20 years. However, the price of the equipment and polyurethane material made it way too expensive for private contractors to adopt and replace traditional mudjacking.
Farmed salmon available in Washington state markets is produced in Washington State, Canada, Maine, or Chile. Studies on salmon from these sources have shown low levels of organic contaminants in the fish.
In crowded net pens they can become epidemics. Diseases and parasites also transfer from farmed to wild salmon populations. A recent study in British Columbia links the spread of parasitic sea lice from river salmon farms to wild pink salmon in the same river.