Lac de Montbel is a category 2 water and one of the few in the area where night fishing is allowed, there are restrictions however. You are not allowed to fish within the area of hydro-electric installations, and "the use of electrical equipment is restricted" I`m not sure if bait boats would fall into that category. Permits can be purchased from the many fishing/hunting suppliers. A day permit costing 10 euro`s, 30 euro`s for a holiday permit (15 consequitive days between June and September), 47 euro`s for a annual permit and 24 euro`s for a childs permit. You can find further information on the Aude/Ariege tourist info web site( French only) Try hitting the Google translate key. God luck. Regards Mick.