From a human perspective, the ocean is mind-bogglingly vast, deep and mysterious. Many of us live along the coast, or visit it on vacation, but few have experienced the high seas. We may not think much about marine life until it’s on our plates.
But this week Ed Kenney, a Hawaii-based celebrity chef and a member of the Seafood Watch Blue Ribbon Task Force, called on people to rethink our appetite for one particular fish: Pacific bluefin tuna. These huge, fast predators, which migrate thousands of miles across the Earth’s largest ocean, are now down to less than 3 percent of their historical abundance due to overfishing.
We’ve learned a lot about the movement of Pacific bluefin by tagging more than 1,400 fish off the coast of California. But, mysteriously, not one of these individuals has made it back across the Pacific to spawn in the Sea of Japan.
The Conservation & Science team at the Monterey Bay Aquarium has worked for more than two decades to understand and recover bluefin tuna – particularly Pacific bluefin, whose population has declined historically due to overfishing. A key piece of our efforts is tagging bluefin in the wild so we can document their migrations across ocean basins. Much of our work takes place in the Eastern Pacific, but this summer we’re partnering with Japanese colleagues to tag bluefin tuna in the Sea of Japan. Tuna Research and Conservation Center Research Technician Ethan Estess, working with Program Manager Chuck Farwell, is chronicling his experience in the field. This is the third dispatch in his series; you can read the second here.
It’s Day 9 of our bluefin tuna tagging expedition in the Sea of Japan. I’m sorry to report that after an exciting first day, we haven’t seen a single tuna in over a week.
We head out at 4 a.m. every day, excited at the prospect of a trap full of big bluefin ready to be fitted with satellite tracking tags. But when our crew hauls the net, what do we find? Lots and lots of yellowtail, or hamachi.
That’s fishing, I guess. Last fall I spent three weeks in chilly Nova Scotia and only tagged two tuna. (Weeks of bad weather kept us stuck in a cabin, watching B-rated movies.) Another year, we were hoping to tag bluefin off of Mexico, but the fishing was so slow we watched the entire Lord of the Rings trilogy in a day.
I’m really hoping this isn’t going to be another one of those trips.