One-quarter of fish consumed in Europe comes from aquaculture and research has shown that consumers have a greater preference for wild fishes in comparison with farmed ones. As with other food choices, consumer decisions regarding farmed fish are a complex process involving multiple factors. The main objective of this study is to develop and validate a questionnaire that will measure consumer intentions in the consumption of farmed fish using the theory of planned behaviour (TPB) as a theoretical framework. Based on the TPB model, the study also investigates the relationships between attitudes, subjective norms, perceived behavioural control and intention to consume farmed fish. Data collection was performed through an online survey and a total of 118 valid questionnaires were analysed. Based on tests performed, results indicate that the tested scale for measuring TPB constructs is valid and reliable. Alpha coefficients for intention, attitudes, subjective norms and perceived behavioural control were 0.898, 0.857, 0.748 and 0.953, respectively. Variables in the model explain 40% of the variation in farmed fish consumption intentions. Regression analysis confirmed that attitudes and subjective norms significantly influence intention to consume farmed fish, with the subjective norms being the strongest predictor, while perceived behavioural control does not have a significant impact on behavioural intention.