Fishery product imports by the U.S. have been gradually increasing in recent years. The leading exporting countries include Canada, Chile, China, Ecuador, Indonesia, Thailand, and Vietnam. A source-differentiated Almost Ideal Demand System (AIDS) model and its Error Correction Model (ECM) version are employed to investigate the static and dynamic U.S. import demand for fishery products from the top seven countries using monthly data from January 1999 to September 2012. Long-run and short-run own-price, cross-price and expenditure elasticities are calculated.