Thanks, everyone, for your comments and great suggestions. The
chicken wire is just a temporary measure(effective, but a high
ugliness factor), so I will need to give some careful thought to the
options for a more permanent solution.
BTW, I'm surprised that, today, the fish are beginning to come back up
to the top to check me out when I approach and to eat again. That's
encouraging!

Sean - over the years my fish have developed some interesting colors
and finnage. I don't have any black ones, but several mottled
white/orange ones, yellow/gold ones, some totally white, some intense,
deep orange. As far as fins go, again, lots of variety. One has very
short fins (looks like he has a crew-cut - so I call him "Butch")
while others have very long, flowing tails and fins, like "Rapunzel"
and "Lady Godiva." Some of them have tails that are considerably
longer than their bodies. The young ones are usually black but they
dont stay that color after they get big enough to defend themselves.

Gary