What is the difference between a DELHEZI and a WEEKSII Bichir???!!!

For a good read, the topics that are sticky threads for polys are good. One shows the main varieties

Weeksi- notably larger (sub adult)


And this is the delhezi (much younger)

kno4te said:

Those dels have some nice patterns on them. If urs then I'm a bit jealous. They're potential for brilliant patterns is good.


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Thanks I raised them since they were only 3" haha very glad to see them so large, it sucks because I had to switch my dels and teugs to white sand so there colors have turned more white and light brown, they're in the tank with the weeksii now so I hope they re-color up.

Heres a top op view of it now.

The Op's question has been answered quite nicely. I will emphasize again the comment on size. While they are both upper jaw Bichirs, Weeksii tend to attain lower jaw sizes. Dels are a nice small to mid size poly that are easy to house, Weeksii requires much more room.
IMHO Dels are the most beautifully patterned of all poly's as SawickB has helped demonstrate.

I will attach a few pics for the OP to show a few more variations

Here is a 12 weeksii and a 12" del to compare at that size

Quite a difference in head shape also. Weeksii are called 'fat head' for a reason, their head is pretty massive compared to other bichir. They also retain external gills for a lot longer.
My weeksii


The del has a smaller head that goes more to a point