Tribute to Achoerodus viridis

What's not to love about Achoerodus viridis? They're cuddly, friendly, inquisitive, smart and good-looking. We divers always call them blue gropers even though they're a type of wrasse from the family Labridae (sounds like labrador, which is appropriate).
Virtually every dive on the east coast of NSW will include a sighting of an eastern blue groper. They live as far north as Hervey Bay in Queensland and as far south as Wilson's Promontory in Victoria. I've yet to see a western blue groper (Achoerodus gouldii) which ranges from WA to Melbourne. Interestingly, the western variety can grow a fair bit bigger than the eastern: 1.6 m and 40 kg compared to 1.2 metres and 22 kg.
One diver buddy of mine has become wary of bluies after one apparently acted in an aggressive manner towards her on a dive. They can be a bit pushy sometimes, especially if you unsheathe your knife and they get overly excited at the notion that you might be about to prise an urchin off a rock to feed them, a practice frowned on by a lot of divers these days. It makes sense that if the gropers get used to being fed, they'll take it for granted and even get aggressive; I've seen similar behaviour with kangaroos (but not underwater, though I was once chased by a demented kangaroo into the sea; while I cowered in the water he stood at the water's edge and bellowed at me, looking very smug and alpha). I've heard that if gropers are fed too much by divers there may end up being more than one blue male in a small area, which can lead to all sorts of political turmoil and factionalism. A fascinating and frankly quite weird fact about these fish is that all gropers start out as female and the dominant one in an area turns male and blue. I'm not sure whether there are constant power struggles and battles going on as a new green upstart decides the time is right to turn blue and male and knock out the existing dominant male. Probably not a lot is known about the intricacies of blue groper behaviour (there's still a heck of a lot we don't know about fish behaviour overall) -- maybe I should undertake a study, with a hefty government grant!