The longer parable in Sunday's Gospel is the parable of the net. Unlike rod and reel fishing (one fish at a time), net fishing involves throwing out a net and dragging it back, catching lots of...whatever.
The sorting seen in shows like Deadliest Catch (picking out crabs big enough to keep) gives some idea of what goes on in net fishing.
But since the net drags in everything (even debris), net fishing has lots more sorting. Much of what turns up in the net is unusable and gets thrown away.
And that's the visual image that points to the meaning of this parable: everything gets swept in and sorted, some things are kept and some things are thrown away.
More on Sunday’s Gospel tomorrow.