A new study from an advocacy group shows that overfishing two years ago cost millions of dollars for fishermen in the Gulf of Mexico and South Atlantic.

The study released Monday by the Pew Environment Group says Gulf fishermen lost $12.3 million and South Atlantic fishermen were out $2.9 million because of depleted populations of red snapper and gag grouper. The study says revenues could have been 16-32 percent higher if not for the population declines.