Each type of fishery has the type of vessel and gear required to suit the fish it catches. Small pelagic fishes inhabit the water column, not near the bottom of the ocean nor near the shore. Large vessels are needed to catch small pelagic species off the coast, whereas small vessels, due to their size, operate in coastal areas.
Pelagic fish generally have relatively low market prices and economies of scale are therefore essential to survive in the business. This means that the smaller boats cannot catch the amount of sustainable pelagic fish to make it worth their while. Pelagic trawlers are not in competition with smaller vessels as they fish for different species and in different more offshore fishing grounds. As such, large and small fishing boats/ships can co-exist without any direct competitive advantage.