There's something we are missing here... At least in Brazil, the fishermen do NOT eat adult aros anymore. They catch the brooding parents only for the fry they carry. Some years ago, it was like "not-wasting the fry my meal carries", but now it's "take the precious fry and let this dead not-so-tasty adult fish on the river". This activity is reducing the population quickly, and since you take both the adults and fry off the environment, their gene pool is completely lost from this point on. That's the "environmental" side.
And the "economical" side... Since there are so much harvested WC fry in the market, the captive breeding programs of SA arowanas are not so attractive, because of the reduced price tag of the harvested ones. We have several arapaima breeding projects here in Brazil, but no arowana captive breeding facilities. And this comes from the fact that WC fry are cheap, and they are preferred by ANY potential buyer.
I really think a higher price tag leads to less abuse and niskeeping, and to less DEAD aros due to poor maintenance. And if it lowers the demand, there will be less specimens collected in the wild to offer. This means less harvesting and as a consequence less impact on the arowana population.
A temporary ban is needed for the recovery of the arowana populations, and it wouldn't harm them BTW. Or it is REALLY necessary to include these species in CITES to protect them? I honestly hope it's NOT.
Best regards.
Daniel.