Sealing the Deal

When it comes to food, animals have no concept of human 'ownership'. Anglers in Essex are reportedly distressed, that a seal trapped in the Rochford Reservoir is treating the location, as its personal Waitrose (an upmarket UK food store) (https://www.theguardian.com/environment/2023/jan/11/anglers-despair-as-trapped-seal-eats-essex-lakes-stocks). The Rochford Reservoir has been stocked with fish by Marks Hall Fisheries. Seals are not normally found in freshwater, so this beastie got in by mistake. The animal (a protected species, unlike the fish), has eluded capture, for almost a month. The anglers think it's a crime to be eating 'their' fish. What do they expect the seal to do, before it's recaptured and returned to the sea?