[Syssiphus]

> Fred Fish was an American programmer that mailed out a floppy disk every month with a curated selection of the best open-source software available for the Amiga platform.

Fish disks contained mostly freeware/public domain as far as I remember. Not open-source software.

[JdeBP]

The name "open source" had not even been coined at the time. "PD" was a popular contemporary prefix for things, although their actual public domain status was legally questionable, irrespective of the FSF's objections to the idea.