Can anyone tell me why there is a big dolphin swimming with this school of tuna? He’s middle-far right in the picture in post #12.
The dolphin run with the tuna...he said when they are *out there* they watch for the dolphin and are able to locate the schools of tuna.
When they *chum* for the tuna, the dolphins come in and grab all the bait; they are an annoyance at times.
Purse seine fishermen of tuna, scoop up the schools, dolphins and all, hence the outcry from environmentalists you read about, who release the dolphins (by-catch)....that's where you have begun see *dolphin-safe* labeled tuna.
NOAA has a short article here: http://dolphinsafe.gov/faq.htm