I dont know much about breeding captive catfish... Mixing a few wild of the same species, may up your odds.

Cow hoofprints in stock dams have seems to cause catfish, blues and channel, to spawn in some of the ponds I fish.

Sunken tires may work too.

I have heard of noodlers placing there own structure to know where to find big cats on rivers, like a fridge with no door.

Water is the basis of all life, by design!