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The Eastern Canada Region Vessel Traffic Services (ECAREG-VTS) database reported 1377 foreign vessel entries in 1991. Of the 1012 vessels originating from a last-port-of-call (LPOC) that was outside the Northwest Atlantic area, 68% entered through Halifax, NS; 30% Saint John, NB; and 2% St. John's, NL discharging 2.1, 2.6 and 0.02 million tonnes of ballast water for an estimated total of 4.7 million tonnes of ballast water of foreign origin.
For the Pacific coast, the Vancouver and Prince-Rupert port authorities reported 3117 and 398 foreign vessel entries in 1991, respectively Of these 3023 and 386 originated from a last-port-of-call that was outside the Northeast Pacific. These vessels discharged respectively an estimated 33.5 and 5.4 million tonnes of ballast water from foreign origin in the ports of Vancouver and Prince-Rupert, for a total of about 38.9 million tonnes.
For the Great Lakes-St. Lawrence River system, it was reported that there were 755 vessel entries in 1991, of which 735 originated from a last-port-of-call that was outside the Northwest Atlantic area, resulting is approximately 2.5 million tonnes of ballast water from foreign origin discharged in the ports upstream of Montréal and in those from Québec City to Montréal.
However, it was in the Great Lakes region that concerns about ballast water discharge became elevated to that of a serious environmental problem. For more information, please refer to Alien Invasive Species.