By way of derogation from points 1 and 2, and where efficient management of fishing opportunities so requires, a Member State may allocate the right to additional days absent from port to fishing vessels flying its flag, where an equal amount of days absent from port is withdrawn from other fishing vessels flying its flag that are subject to effort restriction in the same area and where the capacity, in terms of kW, of each of the donor fishing vessels is equal to, or larger than, that of the receiving fishing vessels. The number of receiving fishing vessels may not exceed 15 % of the total number of fishing vessels of the Member State concerned, as indicated in point 1.