ABSTRACT
Interannual variation in the diet might be expected to follow variation in the availability of preferred prey. Declines in the availability of common prey could lead harbour porpoises to switch to other prey species and/or prey sizes. For some of the commercial fish species eaten by porpoises, estimates of abundance and size distributions are available. However, this is not the case for many other prey species (e.g. the smaller inshore fish such as blennies, gobies and eels).
