Federal regulators slapped a six-month ban on most cod fishing off New England this week and are threatening to cut next year’s catch by up to 75 percent, in a move some say will destroy the livelihoods of fishermen across the region. ... NOAA announced several measures, including the ban which expands no-fishing zones, on Monday. But fishermen whose livelihoods rely on catching cod, as well as the coastal communities that depend on money coming in from that industry, worry the new regulations will devastate them.