A lot bigger than a mackerel. My neighbor is growing Triploids, which I am sure that this has to be (that is a fish that cannot reproduce so all the energy that would go into reproduction goes into growth. We have been trying for a world record for a couple years now but they die before they get big enough.
http://www.grindtv.com/outdoor/excu...-zealand-brown-trout-possibly-a-world-record/
This one is amazing
http://www.grindtv.com/outdoor/excu...-zealand-brown-trout-possibly-a-world-record/
This one is amazing