Yes my family historyI also already read about that, not only about the Basques, but about the Iberians in general. But as far as I know all comproved situations were post 1492.
EDIT: José Mountinho, História da Pesca do Bacalhau (History of the Codfish): http://www.mariomoutinho.pt/images/PDFs/LIVROSdigitalizados/HistoriaBacalhau.pdf
pp. 15-24. (in Portuguese)
Sent from my Pixel using Tapatalk