I can tell you that this year they've seen some of the biggest cods returned since the moratorium went into effect. A full-grown cod ages, most likely up to about 25 years. That's a pretty good estimate. With regard to their migration periods—and the ocean is getting warmer—they are heading up to more northern parts, even outside of the natural zone.
From what I've heard over the last couple of years, it has been a pretty sizeable increase for catch.