Sustainability is another magic word. Asians love their seafood. 50% of all wild caught Alaska salmon is exported to Asia. Tuna is auctioned off for record prices in Tokyo's Tsukiji fish market. With an ever growing population and its ever growing appetite it is necessary to favour fishing practices which can maintain the population of fish without negatively impacting other species by keeping them from their food source, killing them as bycatch or destroying their natural habitat as in unsustainable fishing methods like trawling.