Otters are a mobile species travelling between resting, foraging and breeding sites over large home ranges. Male otters have larger home ranges than females. In Wales otters have been monitored through the Otter Survey of Wales since the 1970s. Otters present within the SAC are part of a wider population living around freshwater habitats around Carmarthen Bay, which itself is not completely isolated but extends further afield and between which there are movements and exchanges. 

It is known that coastal habitat in the SAC is important to otter in terms of foraging for food and resting, travelling between sites and as an access corridor to their primary habitat up stream. Therefore, it is important that the habitat quality and functionality is maintained within and around the SAC.