New Hampshire's "Salmon Sunday" a Great Learning Experience For Kids wfn New Hampshire's "Salmon Sunday" a Great Learning Experience For Kids Salmon for the stripping demonstration are netted from Lake Winnipesaukee during October and early November. They are returned to the lake after their eggs and milt have been collected. The fertilized eggs are taken to Powder Mill Hatchery in New Durham, where they will hatch in three to four months. The salmon are raised in the hatchery for about 18 months, then stocked into Lake Winnipesaukee and other New Hampshire lakes.Fish and Game staff will be on hand to answer questions about salmon, the egg-stripping process and the stocking program that ensures these beautiful fish continue to be available in the lakes for anglers to catch. Salmon Sunday is a "rain or shine" event. Dress warmly.