I got good results with bonito, stumps and hottis, not by brining, but salting them with with coarse pink himalayan rock salt (no iodine) and then hanging them in the shade for a while. It sucks the moisture out onto newspaper. Here I get it in Aurora spar but in Pretoria the best place to find it will probably be in the Groenkloof spar(if it still exists) on the shelf where they keep the health fanatics seeds, nuts, glueten free flour etc. Try cook the fish slowly without the burst of heat. Tastes better and im sure is still safe.