In this study, we use the theory of the marketing firm to explain marketing relationships between consumers and firms selling fish in the context of developing the e-commerce sector for the fishery industry. We use a unique dataset composed of quantitative and qualitative data to provide a behavioural economic analysis and interpretation. The results reveal interdependent managerial and consumer behavioural relationships indicating the presence of bilateral contingencies. The results also provide some indication of the theory of transaction cost, where cost-intensive activities are likely to be internalised within marketing firms selling fish.