When I told my editor, a year ago, that dozens of fish had turned up dead near the Kensington gold mine north of Juneau, he immediately wanted to know: What kind of fish?

Just one or two pink salmon had died, I told him. Most of the fish were two other species: some trout-like Dolly Varden and numerous slimy sculpin.

“No one gives a s**t about sculpin lol,” Nat, my editor, texted me. 

The point…