The popularity of Omega-3, in particular, is the source of a structural change in the ratio of these two prices since 2012. The resulting ratio is assumed to be maintained over the medium-term except in the years where the El Nino phenomenon occurs. For individual fishery commodities, price volatility could be more pronounced due to supply swings caused by changes in catch quotas, disease outbreaks in the aquaculture sector (for example, as the one affecting shrimps production in Mexico and Thailand at present) as well as fluctuations in feed costs. This is about 17% higher than in the base period 2011-13, but it represents a slower annual growth compared to the previous decade (1.2% versus 2.1%).