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Smells like fish!

No something similar to the Music Nomad F-one oil .. and, I should add, this is seemingly the only meaningful answer I’ve read on this thread .. maybe the strings manufacturer applied some kind of oil onto the strings after their fabrication; it then became rancid and smelly for whatever reason .. if the problem is in the strings the OP may just get rid of them ASAP.
For that bass, aside from an impossible change of headstock shape, I’d suggest a set of LaBella DTF 760FL.

I was going in with the mockery, I admit. If the fretboard happened to be the focus here, I’d say that, similarly, the wood used on my Squier SS Jag had (and still has) a very strong odor.
 
Seriously (I guess). Sometimes iron develops fishy odors. Not sure what that is. I’ve noticed from cast iron fry pans and also tools in my humid Oregon garage. Something to do with incipient rusting or a redox reaction, and oily substances coating the iron or steel.