Most eel fry come from the wild, and a few are self-bred.
Don't believe in the so-called artificially bred "good" eel fry, those are mostly wild fry, expensive, with unsatisfactory survival rates and weight gain multipliers.
Personally, I suggest that you buy local wild eels as seedlings, so that the survival rate and adaptability are guaranteed.
In addition, Hubei Zhijiang eel farming industry is very developed, local farmers are digging ponds, set up net box eel farming, if not far is to visit and learn.