tides in the Bay of Fundy. The first European mention of the bore was by British Lieutenant Colonel George Scott on 17 November 1758, during a downstream voyage from Moncton to Fort Frederick, near Saint John. The Admiralty referred to the tidal bore in a hydrographic chart published in 1861, observing that "[after] its passage the rise of the tide is very rapid until high water is attained", and that "[during the lowest tides] the Bore still appears but its broken front usually is only a few inches high." The bores ranged from in height, with speeds from . In 1825, Peter Fisher noted that the "noise of the Bore is heard a great distance, and animals immediately take to the highland, and manifest visible signs of terror if near it." Before the causeway (1968), values were compared with the tidal bores of the Qiantang, Hooghly and Amazon rivers. After the causeway was built, the bores reached heights from about . Wildlife Before the construction of the causeway, the Petitcodiac River was home to many aquatic species. Fish originally included hundreds of thousands of Atlantic tomcod and rainbow smelt, tens of thousands of gaspereau and American shad, thousands of American eel, Atlantic salmon, brook trout, lamprey, and striped bass and hundreds of Atlantic sturgeon. Other fish include the blueback herring, the brown bullhead, the chain pickerel, the smallmouth bass, the white perch, and the white sucker. Marine mammals were uncommon, but normally consisted of pilot whales, Atlantic white-sided dolphins, harbour porpoise, harbour seals, and porbeagles. Freshwater mollusc species included the brook floater, the dwarf wedgemussel, the eastern elliptio, the eastern floater, the eastern pearlshell, and the triangle floater. Many other aquatic organisms are thought to have once entered the watershed due to the low salinity of the water. Six species have disappeared from the river since the mid-1980s. The Petitcodiac River was the only known Canadian habitat of the dwarf wedgemussel, and was later isolated to just nine American watersheds after its elimination from the Petitcodiac. The Atlantic salmon is no longer present in the watershed, and has since been listed as an endangered species in Canada. The American shad was a favourite with fishermen, and represented two-thirds of the entire Canadian shad landings from 1870 to 1900; catches peaked at million kilograms (two to six million pounds) per year. Three other species have been eliminated from the river: the