In the week when we launched the national park plan, the people constructing the works on Drumkinnon bay on Loch Lomond delayed some of the engineering works by two weeks to let the powan, a rare fish found in the loch, spawn. Two weeks' delay in a construction project is not something that any construction manager will welcome, but that two-week window of opportunity enabled that rare fish to spawn.Such detailed management issues are critical for nature conservation and we must ensure that major organisations are consulted and involved in the drafting of the national parks plan.