Interactions between fisheries and aquaculture have become a major issue that is still insufficiently studied. Therefore, the objective of this article is to test whether the cultured and wild gilthead sea bream in the Spanish seafood markets are integrated. By using the Johansen methodology, cointegration of the price series of farmed and wild gilthead sea bream was tested. In contrast to previous studies, our econometric results show that wild and the farmed gilthead sea bream form two heterogeneous products in the Spanish market. These new results question the generalization currently accepted by the scientific literature that farmed and wild fish are substitutes when they belong to the same species. The binomial product-market, along with some specific features of the Spanish market, such as the negative perceptions of aquaculture by some significant groups of consumers, appeared to have a great explanatory power for justifying these different results.

The aim of this work is to prove the significant relationship between the economic crisis and the increase of the shellfish poaching in Galicia (NW Spain) during the period 2008–2012. A relationship was observed between the “necessity” causes and the economic incentives as an explanation for shellfish poaching. The results achieved pointing out the importance to complete the coercive dissuasive methods in the fight against poaching using informal management mechanisms implemented in Galician shellfish communities, especially in co-managed contexts in which unemployment and necessity processes are identified.