How Are Tuna Caught?
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The two most common methods to catch tuna commercially are “purse seining,” and “long lines.”
Purse Seining
A purse seine is a large cylindrical net that wraps around a school of fish much like a drawstring coin purse, except that the draw string opening is at the bottom, toward the ocean floor, rather than at the top. Unfortunately by-catch is high with this method. (Bycatch is unwanted fish and animals caught accidentally in fishing gear and discarded overboard, dead or dying. This bycatch could be sea turtles, dolphins, and numerous species of fish.) The reason that bycatch is high is that in the ocean different species of fish may school together for protection. Tuna tend to school with dolphins because dolphins keep the tuna’s natural enemy, the shark away. Hence the public outcry for dolphin safe tuna.
Longlining
Good Old Fishing Pole and Line
By far the most sustainable method for catching Tuna is the old fashioned way, with a fishing pole and line. By throwing live sardines and anchovies overboard you can attract a school of tuna. The tuna swarm and you can catch them one by one with little to no risk of catching untargeted species. If on the off chance you did catch something on your line unintentionally you would know it and could unset the hook and release the fish or animal with minimal harm. Unfortunately in the case of the Bluefin, stocks have been so decimated and the mercury levels are such, that one must ask themselves if it is worth it, despite the large profit and high demand.
References:
http://www.montereybayaquarium.org/
http://www.nmfs.noaa.gov/fishwatch/species/atl_bluefin_tuna.htm
Posted by Lisa Adza
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