Often wondered as to why there is a difference in shooting seasons above and below highwater mark - Claimed to be due to the fact that duck inland start breeding - even in early February - whereas the majority of coastal estuarine duck are migratory and will not be breeding until they return to their summer residences.
On the Dyfi the shooting zone is below 'mean high water mark' anyone shooting above that is technically breaking the rules unless they have the permission of the landowner.