I remember this movie…
There was a scene where there were a bunch of fish (tuna?) nose down on the sea floor.
This same movie may also include a giant octopus attacking a bridge, but I couldn’t swear to it.
Fairly certain that it was in color, but it was a LONG time ago.
I saw it years ago (25+?) on one of those Saturday Afternoon Monster Movie Matinees. I think. Maybe.
My sis and mom both remember the same thing, but have no idea where it came from. Honestly, it’s been driving us nuts for years.
Hope someone can help.