I was one such person, until I read this post last year.
The ecological disaster that is dolphin safe tuna by Southern Fried Science is one of my top five ever blog posts (the top prize going to the Nacho Average Cheesecake by the sadly ended Chem Blog. Read it read it read it!)
For those of us too lazy to click through, I’ll summarize the dolphin safe tuna post. Consider this cliffnotes. Hells, I’m just that kinda pirate.
To fish for tuna, ships like to locate a big school of ’em so they can nab them all at once. Finding a school of tuna is tricky.
The non-dolphin safe method is to follow some dolphins, because dolphins have their fins on the pulse and know the happy-haps of where the tuna are at. Dolphins are easy to follow because they come up to the surface for air. The downside is that the dolphins are accidentally caught with the tuna (bycatch), Southern Fried Science estimates it as 500,000 a year.
The dolphin safe method does it differently. Instead, an object is floated on the ocean. For some weird reason, floating objects attract sea life, including big ol’ schools of tuna. So you just scoop up the tuna when it comes in. Of course, this leads to bycatch of its own, including all the other sea life that came to investigate the mysterious floating object. There’s more bycatch through this method, but less of it is dolphins.
When you compare the bycatch of the dolphin safe method and the non-dolphin safe method you come up with the following.
1 dolphin saved through dolphin safe fishing costs 382 mahi-mahi, 188 wahoo, 82 yellowtail and other large fish, 27 sharks, and almost 1,200 small fish.
Food for thought. Read the original post here.