whereas Atlantic salmon is higher in fat and calories, says registered dietitian Frances Largeman-Roth. According to the U.S.

Weight loss: Tuna is high in protein and low in calories, which can help with weight loss. Skin health: Omega-3s in tuna can ...

Wild dolphins need up to 33,000 calories a day, researchers have found - equivalent to about 60 portions of salmon. In contrast, Olympic swimmers - who are smaller and less active - burn about ...