Beyond just helping the ocean and the fish in the ocean stay balanced, overfishing is in-humane. People mainly think about cows or pigs or chickens being brutally murdered whenever they do actually think about how an item ended up on their plate; but fish can be murdered just as heartlessly. The bluefin tuna is slowly dwindling in its numbers and if things don't stop, they will soon cease to exist.
But there is hope! According to an article published by Willie Mackenzie on November 12th of last year (2009), talk has begun to rise about closing fisheries to help the bluefin tuna population grow once again. These closes would only take place for about a year, but that's still a step in a positive direction!
MacKenzie, Willie. "Could Bluefin Tuna Fisheries be Closed?." Fishing News 12 November 1009: n. pag. Web. 30 Jan 2010.
"The End of the Line-Killing Bluefin Tuna." youtube. Web. 30 Jan 2010.