So that tuna fish sandwich does have its costs. Gary Griggs is a Distinguished Professor of Earth and Planetary Sciences at ...

Tuna “ranchers” believe that their operations take pressure off wild tuna populations because the tuna fishermen get a better price for their catch and therefore need to fish less intensively.

They said they spotted the 3m-long tuna after noticing "a feeding frenzy" near their salmon enclosures. The fish was eventually caught using a net and crane and was returned to the sea.