"Keeping tuna in tanks and cages complicates reproduction—the massive fish are extremely active and typically migrate great distances, so simulating their natural environment is nearly impossible. Zohar and colleagues hypothesized that when the fish in captivity, a key hormone used in bluefin reproduction, gonadotroptin-releasing hormone (GnRH), isn’t produced or malfunctions. So the researchers created a synthetic version of GnRH, inserted it in a biodegradable device that slowly releases the substance over a period of time, and implanted it into adult bluefin.
The technique works, getting tuna to produce fertilized eggs. “The [implants] result in spawning and production of juveniles that will be used both for aquaculture for food consumption as well as potentially to be released to the wild for stock enhancement,” Zohar says. The technology is now used facilities and labs around the world, including Clean Seas, a commercial bluefin tuna farm in Australia."


I would agree that would be the biggest hurdle. If they can overcome that with hormones, it couldbe great. Seems almost impossible to me, anyone have a video of this?