One of the redeeming virtues of the study of economics is that it enables its practitioners to discuss subjects about which they know very little. This paper represents a case in point. The premise of the paper rests on the presumption that aquaculture provides an additional source of aquatic life; this presumption is, of course, true by definition. The purpose of this paper is to investigate the potential of aquaculture to regulate the harvest from natural production, but more importantly the purpose is to consider the difficulties that even relatively simple tools pose for the fishery manager.