The Gulf of St. Lawrence (GSL) is a semi-enclosed sea located in Atlantic Canada, which is warming rapidly. Redfish, a complex of two morphologically similar, demersal fish species (Sebastes mentella and S. fasciatus), have drastically increased in biomass after two decades of low biomass. Meanwhile, several cold-water species, such as the northern shrimp (Pandalus borealis), are collapsing. The latter is an important prey for redfish and, in addition to a temperature-driven shrinking habitat, they are likely suffering from an increase in predation pressure. To better understand the trophic dynamics between these key species of the GSL, we studied their functional response. Functional responses describe how the rate of consumption of a resource by a consumer changes with the resource’s density, providing precious insights on the energy flow between the two species and the stability of their dynamics. Using Generalized Additive Models, we show that redfish currently exhibit a type III functional response towards northern shrimp, associated with a predation pressure that decreases at low shrimp densities. This type of response is known to have a stabilising effect on population dynamics and might mitigate redfish impact on shrimp populations. Furthermore, this response evolved between the 1990s and the 2010s, suggesting a possible adaptation of redfish to their changing environment. Our models also showed significant negative effects of warming environmental conditions as well as trophic competition on shrimp consumption by redfish and confirmed the importance of predator size on their feeding habits, as observed in previous studies.