The phrase "poor fishermen" refers to fishermen who do not have a lot of money or resources. They may struggle financially or have limited means in their profession. Full definition
Had, [as some pastors claimed], the population of hell just swelled to include the poor fishermen whose boats had overturned, the pregnant women who couldn't run fast enough to reach higher ground, the elderly who couldn't swim? (rachelheldevans.com)
However, many of the poorest schools allow a daily fee to be paid so that, for instance, a poor fisherman could send his daughter to school on the days he had funds and allow her to make up for the days she missed. (educationnext.org)
The text begins with a poor fisherman, Kino, his wife, Juana, their baby Coyotito, and the great pearl. (achievethecore.org)