If you were starving you might decide to eat your arm. Cut off an inch a day would be fine as long as knew the growth rate of your arm and the rate was regular. If it grew an inch a day every day, no problem, you keep your arm. But if you did not know the rate and it fluctuated you could have a problem. You would have to guess the rate and therein how much you can eat per day but, get it wrong and your in trouble or get it right but then along comes a few bad growth days and your back with the dilemma..
Of course you could decide to ban eating your arm all together but then you starve. Its a dilemma which you are most likely to get wrong.
However, you could have a spare box of arms, genetically reproducing themselves on a regular basis, no matter what mistakes you make you will always have a source of spare arms to fall back on. In fact you could have more arms than you knew what to do with no matter how much you gorged yourself.
Bit the same with the bass, stab a guess every year how many we can take or what size, find we cannot get it right and they keep dwindling until there are none left, the final draconian measure is all that's left, stop eating them altogether. OK, we will not starve but , wouldn't it be better to have a permanent place where they can feed and reproduce themselves continually without interference so we always have spares and maybe a surplus.
I thought I would see this headline one day "bass stocks in danger of collapsing". I predict mackerel could be the next one.
It just don't work, should be a secondary policy to one that does, sanctuaries, they exist but should be developed and expanded as a priority..