Rivets have been used to put things together since the Bronze Age, but it usually took two workers to set them: one with a hammer to pound the rivet through the hole, the other with a bucking bar to set it on the opposite side. Then, in the mid-1930s, engineers developed blind or breakstem rivets.
Salmon are native to tributaries of the North Atlantic (genus Salmo) and Pacific Ocean (genus Oncorhynchus). Many species of salmon have been introduced into non-native environments such as the Great Lakes of North America and Patagonia in South America. Salmon are intensively farmed in many parts of the world.
On average, it takes two to five kilograms of wild fish (used in the feed) to produce one kilogram of farmed salmon. In Chile, the ratio is often much higher with as much as 8 kilos of wild fish used to produce 1 kilo of farmed salmon (Terram Foundation Report). Most of the wild feed for BC farmed salmon is taken from the southern hemisphere, diverting local protein to raise a luxury product for northern consumers.