We have a number of predators in that system that are consuming these less abundant stocks and therefore they maintain their feeding rates despite the fact that the resource is actually in decline. They don't care; they just want to eat.
In this particular case, in the case of shrimp, we have not only cod but we also have redfish that are having a significant impact. The biomass of redfish in this area seems to have increased substantially, although not dramatically, in the last few years.
In addition we also have a large turbot stock that is also feeding on shrimp, and we also have seals and whales that feed on shrimp.