A number of very large unconfirmed great white shark specimens have been recorded. For decades, many ichthyological works, as well as the "Guinness Book of World Records", listed two great white sharks as the largest individuals: In the 1870s, a great white captured in southern Australian waters, near Port Fairy, and an shark trapped in a herring weir in New Brunswick, Canada, in the 1930s. However, these measurements were not obtained in a rigorous, scientifically valid manner, and researchers have questioned the reliability of these measurements for a long time, noting they were much larger than any other accurately reported sighting. Later studies proved these doubts to be well founded. This New Brunswick shark may have been a misidentified basking shark, as the two have similar body shapes. The question of the Port Fairy shark was settled in the 1970s when J. E. Randall examined the shark's jaws and "found that the Port Fairy shark was of the order of in length and suggested that a mistake had been made in the original record, in 1870, of the shark's length". These wrong measurements would make the alleged shark more than five times heavier than it really was.