A follow-up on Tuna

"Welcome to the strange world of globalisation." That is Roberto Mielgo's response to the fact that it is commercially viable to catch and keep live tuna in off-shore pens - or ranches - in the Spanish Mediterranean and feed them vast amounts of expensive caught fish (around 10kg of feed fish serve to make the tuna put on 1kg of body weight).  

Here is a good article from the BBC that follows-up on the recent set-backs for bluefin tuna conservation, and provides additional reasons why "farmed" and "ranched" fish is actually worse for the oceans.