Making sushi from salmon can considerably minimize the risk of mercury poisoning. This is because mercury levels in salmon are far less as compared to tuna. So sushi consisting of salmon is definitely a safer and a healthier alternative to sushi tuna. Also, preparing this Japanese dish at home, instead of going to the restaurant, can substantially decrease exposure to high levels of mercury.
Read more at Buzzle: http://www.buzzle.com/articles/mercury-poisoning-from-sushi.html