This is Robert Petway's version (1941).

CATFISH BLUES

1 Well I lay down down last night : well I tried to take my rest
2 Notion struck me last night baby : I believe I take a stroll out west
3 Well if I were a catfish mama : I said swimming deep down in the deep blue sea
4 All these gals now sweet mama : I said now setting out hooks for me
5 Well I went down yeah down to the churchhouse : yes well they called on me to pray
6 Got on my knees now mama : I didn't know not not a word to say
7 Somebody write write me a letter baby : I'm going to write it just you see
8 See if my baby my baby : do she thinking of little old thing of me

(Source: Michael Taft, Blues Lyric Poetry: An Anthology, Garland, 1983, p. 216)

~Masato