In the wild they love to spawn in discarded cans. One spring I found every
can to contain one madtom, male my guess, gaurding a plaque of eggs. I think
they were on the bottom of the can, but it is hard to be sure. Like
bullheads, the eggs were large opaque, and orange yellow color. They were
all stuck together in a flat lump. Not many if any rocks in the marsh, I
figure they dig out under wood pieces. Maybe even in holes in the bank from
muskrats or crawfish burrows. Just guessing there.
By the way, I tried using cans for madtom traps, they didn't work.
Ray W.
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