No problem Graham, I went deep sea fishing off the coast of Mozambique in 2011. Caught some YellowFin Tuna. Amazing experience. The water there is very warm, and I see Bluefin prefers colder water.
Also saw this reality program on TV about the Sydney Fisherman in Australia catching yellow fin. Fetching high prices at the market as well. But living that life is something else, at sea for months...
I know that Mozambique waters well and go a few times a year to a place called Nhoxani.com which is quite magnificant and have caught all sorts including yellowfin and Marlin
Life as a commercial fisherman is not my thing but thank goodness for those fine fellows