Can I keep walking catfish in my pond?

Fishman Dave

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Clarias batrachus tend to max out at around 18” from experience. Because they are an eel type cat they can manouver very well in tight spaces.
Not sure on the dimensions of your pond but at first thought I would not have a concern 400g was too small for a pair. The benefit being of course that they are clearly visible from above if you get the marbled or white version.
 

thebiggerthebetter

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I'm again with Dave.

Moreover, the footprint is more important for a catfish like this than the water depth and your footprint is great for a 400 gal.

Plus, if you get a captive bred one (I believe all the white and piebald ones to be such), chances are it'd be a cull from a farming operation and hence will hardly reach its full potential size.
 
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