"So, when we breathe we're getting something from the air, and when fish breathe they're getting something from the water. But it's the same something, and where it ends up is the blood. I just... pull it all back out of them, and they basically drown."

He scoops a sixth mysteriously dying trout into the basket, eyes it, decides it is a little small, and turns his attention back to the water to await a seventh.