When it comes to large old adult wild caught bichirs, we do not really know the max sizes as some were being caught much larger that what we know of. We can only know the potential max size of captive breeds which varies from owner to owner and those wc that where being caught young. As for the CB bichirs nowadays. They seems to get smaller and smaller in size. I got a 13" 6 years old endli that never grew anymore. I also seen my buddy's 9" delhezi that don't grow anymore and it's 4 years old now.