Tuna is a valuable and nutritious food fish. It is fished for commercially worldwide, especially by the [[Japan]]ese, both with lines and nets (in which [[dolphin]]s are often caught simultaneously; since dolphins often swim in company with tuna (this is why tuna are often described as dolphin-friendly), unscrupulous fishermen sometimes deliberately net the dolphins to catch the tuna. | Tuna is a valuable and nutritious food fish. It is fished for commercially worldwide, especially by the [[Japan]]ese, both with lines and nets (in which [[dolphin]]s are often caught simultaneously; since dolphins often swim in company with tuna (this is why tuna are often described as dolphin-friendly), unscrupulous fishermen sometimes deliberately net the dolphins to catch the tuna. |