There is a way to cheese them on mobile:

Any electrophorus can be tamed without struggle because you do not need to dismount to feed it and they will ignore you as long as you're mounted which means you don't need to worry about them attacking you(I've done this already)

I think this works with the basilosuarus because the creatures following it should ignore you(I haven't tried this yet though)

More Electrophorus Taming & KO Tips