A hatchery chum harvest nearly 50 percent larger than last year’s record combined with the largest sockeye catch in 20 years propelled the value of the Lynn Canal drift gillnet fishery to $15.4 million in 2012.

That made the local commercial fishing season among the most lucrative in the past 30 years.

“It was a big year this year. There were lots of records,” said Alaska Department of Fish and Game commercial fisheries biologist Randy…