Filet mignon of the sky. That right there is a GBH, my most hated enemy besides otters.
You don't have eagles bothering you guys up there? I'm hosting a pair at the hatchery most days for the last year. Expensive decorations....
Biggest problem we used to have was squawks (crested night herons). I counted more than 300 on one set of raceways one night, and F&G's official count for the whole valley was 264.
But yes, Great Blue Heron. I've heard tell #4 shot works as expected.