Open this photo in gallery: Shipping cranes lie idle in Vancouver after 7,400 unionized waterfront employees went on strike on Saturday. More than 35 terminals across the province have been hit in the walkout.CHRIS HELGREN/Reuters The Port of Vancouver is clogging up with cargo during a strike by waterfront workers across British Columbia as imported seafood has yet to be unloaded and potash exports are stuck onshore, adding to the growing bottlenecks at terminals and warehouses. The strike by 7,400 unionized waterfront employees began on Saturday, disrupting Canada’s largest port and three smaller regions. More than 35 terminals across the…