Here is some more to think about,
Charter boats also make up recreational catches, some of these are based in and fish the Hauraki Gulf and the Firth of Thames, which is apparently where our main fish stocks come from for SNA1.
If these boats carried on average 8 fishers, and get out on average 200 days of the year and average 5 fish per person that's 8000 fish per boat per year. Thats fish not weights to so you guys can do the math on that one, and when the fishing's hot you don't be keeping anything little so they could be averaging a kilo n a half plus(its actually called high grading and its a legal but its to hard to police now that so much catch and release is done.)
Now remember that these guys can get out and fish a whole lot more times than that of anyone on an open coast line and that there favorite time to be fishing is the work ups in spring as the fish get ready to spawn.
Add to that a third of NZ's population having access to that and friends and family with boats doing the same on the weekends and the way the population is growing and you really do start to see why something needs to be done.
Personal i think charter boat operators do need to be put under the commercial tag as they are making a living off this. This in turn would drop the estimated recreational catch down ten fold.
Just something more to think about, but how you get the government to look at all the different scenarios and then work it out i don't know as the MPI makes the proposals that get reviewed.