It appears that it was, and that it was even fed to pigs. (I can’t believe I’m being so direct.)
Lobster has long been thought of as a slave or convict’s diet, and it is occasionally utilized as fertilizer. (After all, it’s still a huge cockroach that lives in the water).
Salmon was also abundant in the South West, and it appears that it was once banned to give it to its slaves more than twice a week.
The sturgeon Acipenser sturio was widely prevalent in the Gironde, Dordogne, and Garonne estuaries at the start of the twentieth century, where females returned to spawn.