There are several reasons that targeted research on the variable cost of fishing is warranted as part of the bioeconomic activities of the theme. First, some fisheries regulations have evolved over long periods with lower fishing costs, a revision of these could increase the profitability of the fishery and may be necessary to ensure economic viability into the future. Secondly, fuel is one of the largest variable cost factors in most fisheries and has proven to be highly volatile in price over the last few years; extensive evidence suggests that fuel prices will continue to rise at rates significantly faster than most other costs. Third, the economic flows from fuel consumption tend to provide a lower contribution to GDP than other variable costs such as labour (due to the export nature of the cost); consequently disproportionate increases in fuel prices may result in a lower fishery contribution to GDP.