(65)Member States should ensure that adequate financial resources are always available in order to appropriately staff and equip the competent authorities performing official controls and other official activities. Although operators are primarily responsible for ensuring that their activities are carried out in compliance with Union agri-food chain legislation, the system of own controls that they put in place for that purpose should be complemented by a dedicated system of official controls maintained by each Member State to ensure effective market surveillance along the agri-food chain. Such a system is, by its very nature, complex and resource-demanding and should be provided with a stable influx of resources for official controls, and at a level appropriate to the enforcement needs at any given moment. To reduce the dependency of the official control system on public finances, competent authorities should collect fees or charges to cover the costs they incur when performing official controls on certain operators and for certain activities for which Union agri-food chain legislation requires registration or approval in accordance with Union rules on the hygiene of food and feed or rules governing plant health. Fees or charges should also be collected from operators to compensate the costs of official controls performed in view of issuing an official certificate or attestation and costs of official controls performed by the competent authorities at border control posts.