they said they left home because the fish are gone.
This is what comes up searching for their town, Fass Boye:
A waste of fish: Food security under threat from the fishmeal and fish oil industry in West Africa’ is a 2019 report into food security in the region. Greenpeace Africa is calling on governments to immediately phase it out to stop the threat to regional fish stocks, which are essential for the food security and livelihoods of local people.